DP CPD

Safe working limits should be determined for each geographical location, expected environmental condition/force and appropriate task to be performed. What should these limits consider?. Limiting factors are purely a factor of the vessel's design. Limits need not be considered for each geographical location. Limits should consider the failure modes of the power distribution system. Limits need to consider every failure mode covered by the FMEA and the likely time to restore position control and return to a safe situation. Limits need not be considered for each geographical location.

The key elements of a fault tolerant design are performance, protection, and detection. What does protection mean in this context?. The prevention of partial or total blackout. The prevention of faults transferring from one redundancy group / sub system to another. The prevention of faults transferring between DP Control Computers. The prevention of faults transferring across power distribution systems.

The operator controls on equipment class 2 and 3 vessels are designed so that no single inadvertent act on the operator panel will lead to which of the following conditions?. A condition as defined by the ASOG that causes either a yellow or red status. Loss of position and/or heading. Loss of the DP consequence analysis. Loss of the DP consequence analysis.

To which vessels does Section 4 of IMO MSC 1580 Guidelines for Vessels and Units with Dynamic Positioning (DP) Systems apply?. All DP equipment class 3 vessels. All DP vessels. All DP vessels built after the adoption of IMO MSC 1580 Guidelines for Vessels and Units with Dynamic Positioning (DP) Systems - 16th June 2017. Only to DP Mobile Offshore Drilling Units (MODUs).

Under what scenario should DP capability plots be re-calculated or DP Footprints taken?. Following the 5 year update of the DP FMEA and classification society certificate. After upgrade of DP software which has resulted in a change of the Kalman filter model. After a change in the location of antennas that will affect position reference system offset data. In the event of maintenance that renders a thruster unavailable.

Under what potential scenario should DP capability plots be recalculated?. After a change in the location of antennas that will affect position reference system offset data. Following the 5-year update of the DP FMEA and classification society certificate. Following the addition or removal of equipment (such as crane or accommodation module) which may alter the vessel's wind profile. After upgrade of DP software which has resulted in a change of the Kalman filter model.

What course of action should be taken in the event that any configurations change in equipment set up such as UPS supplies?. The FMEA should be updated prior to any changes in configuration that may affect redundancy groups. UPS supplies are more robust as they have battery support. However, changes should be recorded. A Management of Change process should be conducted in order to check the FMEA is not compromised. No configuration changes should be made.

What is the single most effective way to prevent a loss of redundancy that may result in a vessel being unable to complete its mission?. Effective Planned Maintenance. Good Design. Condition Monitoring of DP Equipment and Components. Conducting regular Proving and Annual DP Trials.

What is the purpose of IMCA Industry Guidance?. IMCA guidance is adopted by Flag State, but rarely enforced, as a set of standards that should be followed. IMCA Guidance is designed to promote good practice and support self regulation. IMCA guidance is adopted by Class Societies as a set of standards that support Class Rules. IMCA guidance is adopted by Class Societies as a set of standards that support Class Rules.

What is a hidden failure?. A failure that is not immediately evident to operations or maintenance personnel and has the potential for failure of equipment to perform an on-demand function. A failure that is not detectable and may result in the loss of standby power supplies. A failure mode that cannot be physically seen until the consequences are apparent. A failure of standby battery systems which results in the battery being unable to deliver power when required; specifically, DP UPS power supply arrangements.

What equipment should be located at the DP control station?. DP control and independent joystick control operator stations; vessel machinery control station; engine emergency stops; thruster emergency stops; internal communications; position power management control system. DP control and independent joystick control operator stations; manual thruster levers; mode change systems; thruster emergency stops; Internal communications; position reference systems; HMI when considered necessary. IMO MSC 1580 does not state which equipment should or should not be fitted only that comprehensive control of the vessel's heading and position is managed. As defined by the DP equipment system manufacturer as part of equipment Type Test Notation.

What should the initial survey of equipment class 2 and 3 DP vessels include?. A desktop review of the vessels FMEA and DP operations Manual. A complete survey of the DP system and Failure Mode Effect Analysis (FMEA) proving trials to ensure full compliance with the applicable parts of the Guidelines. Review of Failure Mode Effect Analysis (FMEA) approving trials in relation to redundancy groups and Worst-Case Failure (WCF) events. Attendance at the Failure Mode Effect Analysis (FMEA) proving trials to observe worst case failure testing.

What should DP mobilisation trials demonstrate?. DP mobilisation trials should demonstrate the operational integrity and performance of the ship's crew, and proving the vessel's ability to maintain position. DP mobilisation trials should demonstrate the operational integrity and performance of the vessel's DP system, confirming available thrust. DP mobilisation trials should demonstrate the operational integrity and performance of the vessel's DP system, confirming the vessel's redundancy concept and proving the vessel's ability to maintain position after suffering worst case failure. DP mobilisation trials should demonstrate the operational integrity and performance of the vessel's DP system, confirming the vessel's redundancy concept and proving the vessel's ability to recover following a blackout.

What is the purpose of an initial stabilisation period where the vessel is on DP but does not participate in any industrial mission activity?. To allow time for DPOs to operate the vessel in the DP joystick mode and understand prevailing weather effects prior to 500m zone entry. To allow time to establish and stabilise position reference systems and understand the effect of multipath particularly in connection with GNSS systems. To allow time to perform a field risk assessment, understand weather and exit routes. To allow a time when the DP model can 'learn' and become more accurate through a process called 'kalman filtering'.

What actions should the DPO take if a "Self-Test Error - DP Controller 'A'" alarm is generated on the DP Operating Station"?. The DPO should prepare to immediately terminate operations. The DPO should monitor the system for performance issues and ensure it is recorded in the DP Anomaly log for later investigation. The DPO should inform the Master, consult the ASOG and prepare for a possible DP Yellow activity termination. The DPO should inform the Master, consult the ASOG and prepare for a DP Blue Advisory alert.

What other factors beyond environment, thrust availability, and hull form should be considered in the development of DP capability plots?. Correction factors developed during verification testing at sea trials. Antenna offsets that require correction through Position Reference Systems (PRS). Power generation; step change reaction of engines. Thruster interaction; thruster degradation; thruster barred zones.

When should vessel DP location set-up checks be completed?. DP Location Set-up Checks should be carried out on arrival at the field. Where the vessel is to visit a number of offshore installations on a voyage then these checks need not be repeated as long as the ASOG does not change. DP Location Set-up Checks should be carried out on arrival at the field and conducted outside the 100 metre safety zone. The checks should be repeated when the vessel returns to the field after an absence of more than 48 hours. DP Location Set-up Checks should be carried out on arrival at the field and conducted outside the 500metre safety zone. The checks should be repeated when the vessel returns to the field after an absence of more than 72 hours. DP Location Set-up Checks should be carried out at every working location. Where the vessel is to visit a number of offshore installations on a voyage then these checks should be carried out every time the vessel changes from transit mode to auto DP mode.

When should DP mobilisation trials be carried out?. DP mobilisation trials should be carried out by the vessel prior to the start of operations for a new client. DP mobilisation trials should be carried out by the vessel on field arrival. DP mobilisation trials should be carried out by the vessel after crew change over. DP mobilisation trials should be carried out by the vessel after refit.

When should vessels operating in Equipment Class 2 or 3 terminate operations?. When the environmental conditions or forecast are such that the DP vessel will no longer be able to keep position if a WCF event as identified in the FMEA occurs. When the environmental conditions are such that the DP vessel will no longer be able to keep position with all thrust available. When the environmental conditions are such that the DP vessel will no longer be able to keep position after the loss of one ENGINE. When the environmental conditions are such that the DP vessel will no longer be able to keep position after the loss of ONE thruster.

When should vessel's operating in equipment class 2 or 3 terminate operations?. When the environmental conditions or forecast are such that the DP vessel will no longer be able to keep position if a WCF event as identified in the FMEA occurs. When the environmental conditions are such that the DP vessel will no longer be able to keep position with all thrust available. When the environmental conditions are such that the DP vessel will no longer be able to keep position after the loss of ONE thruster. When the environmental conditions are such that the DP vessel will no longer be able to keep position after the loss of one ENGINE.

When will the consequence analysis NOT work correctly?. During a movement in the DP mode. When the DP joystick is engaged. When the predefined worst-case failure has been incorrectly defined. When the vessel is being operated from the backup Operating Station.

What should failure of a thruster system including pitch, azimuth and/or speed control result in?. No increase in thrust magnitude or change in thrust direction (fail as set or fail to zero). A consequence analysis alarm posted at the DP OS. The thruster fault alarm being posted at the integrated automation system. A prediction alarm posted on the DP OS.

Which of the following is a suitable mix of position reference systems for LIFTING activities that may be in proximity to other offshore structures and in greater than 350m depth?. Acoustic (LBL); Taut Wire; DGNSS. Artemis; Acoustic (LBL); GPS. Acoustic (SBL); DARPS; DGNSS. DGNSS; Acoustic (SBL); Radar.

Which of the following is a suitable mix of position reference systems for SUPPLY OPERATIONS DURING LIFTING activities in greater than 350m depth?. Taut Wire; Laser; Radar. Acoustic; Laser; DARPS. Acoustic; Laser; Radar. DGNSS; Taut Wire; Radar.

Which of the following is a suitable mix of position reference systems for PIPE LAYING activities that are in proximity to other offshore structures and in less than 350m depth?. DGNSS; Taut Wire; Radar. DGNSS; Radar; DARPS. DGNSS; Acoustics (LBL); Radar. DGNSS; Laser; Radar.

With respect to the DP FMEA how should proposed changes to systems or equipment be handled?. Engage Class to approve the changes. Risk Assess as part of a formal Management of Change process and develop an appropriate implementation path as required. Implemented only after a new FMEA has been written. Tested at the next annual trials period to confirm redundancy effect.

Who is the best equipped to author Activity Specific Operating Guidance (ASOG)? ASOG may also be termed a Well Specific Operating Guide (WSOG), Field Specific Operating Guide (FSOG), Locations Specific Operating Guide (LSOG). The field owner / operator who understands the location, develops the ASOG using the vessels DP FMEA, DP Operations manual and other documentation. Vessel staff who understand the operation and will be expected to implement the guide are the best equipped to develop and own the ASOG using data provided by the field operator such as weather and current data. The vessel owner has a relationship with both the vessel and the Client. They are best equipped to develop the ASOG and control its implementation onboard. An independent Third Party that wrote the DP FMEA is the best equipped to develop the ASOG as they technically understand the vessel and are independent.

Why are different elevation masks recommended for multiple DGPS units in operation?. So that Horizontal Dilution of Position (HDOP) are different across systems improving performance against the effects of scintillation. So that there is a mix of satellite geometry across systems improving performance during periods of sunspot activity. So that a common mode position jump does not occur across multiple position references as satellites drop / emerge into view. So that Vertical Dilution of Position effects (VDOP) do not occur causing WSG-84 horizontal positional errors.

Underwater acoustics can be utilized for which of the following applications?. Marking underwater features or hardware. Position reference for DP purposes. Tracking ROVs or other equipment. All of the above.

When using a Global Navigation Satellite System (GNSS) what is the recommended minimum number of satellites required for position fixing?. 1. 2. 4. 5.

Performance of an HPR system is often limited by acoustic conditions in the water. What would be an example of such a condition?. Oil leaking from the ROV. Noise from vessel thrusters. Conversations between divers. Noise from the Taut Wire winch.

A major reason for the loss of hydro-acoustic signals is: Pressure gradient in the water column. Marine growth. Engine vibration. Noise and aeration from thrusters.

Which of the following principles does a GNSS use to determine vessel position?. The GNSS receiver acquires radio signals from satellites, measures the time delay of signal reception and, with known satellite positions, determines multiple position lines. Range and bearing from reference station is determined from a communications satellite; position is therefore determined by the known location of the reference station. GNSS satellites monitor the vessel position and transmit the information via communication satellite to the vessel. The vessel transmits data to the GNSS satellites, which then transmit position data to reference stations for retransmission to the vessel.

Which of the following is NOT a DGNSS quality factor?. The number of satellites being tracked. The Age or Latency of differential correction data. The value of HDOP. Adverse weather conditions.

How are HPR beacons deployed from a DP vessel?. Lowered to the seabed using a wire which remains attached to the vessel. Lowered to the seabed using a wire which may be buoyed off. Placed in position using an ROV. Any of the above methods may be used.

Multipath reception can be a problem for both HPR and GNSS Position Reference Systems by: Causing the system to listen to the wrong signal source. Creating a shorter than correct path for the signals. Decreasing the strength of the received signal. Confusing the distance and/or direction from the source through signal reflection.

A Dual Frequency GNSS receiver is used to: Achieve redundancy in the operation. (wrong answer). Improve accuracy by compensating for ionospheric delay. Get better positioning due to the higher positioning accuracy of military frequencies. Lock on to a satellite on one channel while scanning on another.

What is the maximum practicable range for FMCW Radar PositionReference Systems such as RADius and RadaScan? Q2 17. 10 - 50m. 200 - 1000m. 5000m. 10000m.

If a platform has just one Artemis antenna, how many vessels can be positioned using Artemis as a Position Q2 19. Two vessels provided that they have different frequencies. All vessels within a 5 km range. Five vessels. One Vessel.

A vessel is using one HPR Pole/Transducer in Super Short Baseline (SSBL) mode. Four separate Transponder Beacons are in position and being interrogated. Three beacons are in fixed locations on the sea floor. The fourth beacon is designated 'mobile' and is located on an ROV. For DP Class purposes, this array qualifies as: Two Position Reference Systems. Three Position Reference Systems. Four Position Reference Systems. One Position Reference System.

What might be the 95 percent accuracy of a Differential Global Navigation Satellite System (DGNSS) using a modern commercial subscription service?. Less than 0.1 metre. Less than 1 metre. Less than 0.2 metres. Any of the above, depending on which service is chosen.

Which of the following may adversely affect the quality and accuracy of positional data provided by satellite-based position reference systems?. The close proximity of large platform structures. The DGPS antenna being located too high in the vessel. Interference from laser-based position reference systems. The use of the UTM co-ordinate system.

How does a Laser Position Reference System measure the bearing of a target?. By monitoring the height of the target. By combining the relative bearing of the target with the ship's heading. By measuring the time of flight to and from the target. With reference to information from the Motion Reference Unit.

When is it advisable to deselect the wind sensor?. When a helicopter is about to land on your vessel. When relocating the vessel to a new position under DP control. When temperatures below zero degrees Celsius are forecast or expected. When thunderstorms are in the vicinity.

A vessel is on DP close to a platform structure. A single Wind Sensor is selected. How will the vessel react if the hull and superstructure is in wind shadow and the Wind Sensor is suddenly exposed to the full force of the wind?. The system will apply thrust and move against the 'Current'. The system will maintain position with the average thrust used. The system will apply thrust and move against the wind. The vessel will drift-off.

How many gyro compasses should, according to IMO Equipment Class requirements, be available and online during a Class 2 operation?. 1. 3. 2. 4.

How does a Taut Wire determine vessel position?. Davit-head-mounted sensors monitor the tension in the wire to calculate relative position. It compares wire length measured at any given time with the value at the time of deployment. Davit-head-mounted sensors monitor the tension in the wire to calculate relative position. The sensor head measures the angle to the clump weight. This angle is used with either the measured wire length (or the vertical distance) from the sensor head to calculate the relative position.

Of the items listed below, which is the most important to the operation of the DP system?. The Doppler Log. The Gyro Compass. Wind Sensor. Navigation Radar System.

A cable vessel is engaged in ploughing operations using 'Auto Track' mode. Plough hawser tension is being measured and entered into the DP system. If feedback data from the plough hawser tension sensor is lost, then the probable result will be: The DP system reverts to 'Auto Position' mode. Position control will be lost. Plough tension will be displayed by the system as DP Current. The DP system reverts to Joystick mode.

When the DP system is in full automatic control of the vessel, the DP current is: Determined from the mathematical model. Measured by current sensor. Ignored for the purposes of the model. Updated at 30 minute intervals.

A pipelay vessel is engaged in pipelay operations using DP. In addition to the normal range of position, heading and environment references, feedback may also be required in respect of: Water depth. The position of the pipe touchdown point. Vessel draught, from a draught sensor. Pipe tension values.

Some DP vessels are fitted with draught sensors, enabling continuous draught feedback to the DP system. This is to allow: Automatic correction of the height of Artemis and Fanbeam sensor antennae. Warning to be given of reduced under-keel clearance. Increased accuracy of data from the HPR system. Continuous update of the vessel model regarding changes to the shape of the vessel above and below the waterline.

The vessel is on auto DP using a GPS, Artemis and taut wire, you are concerned that the GPS is not giving accurate position information and you decide to change the reference origin to Artemis, how would you achieve this?. Deselect Artemis, wait for the status to read offline, allow vessel model to stabilise, reselect Artemis. Deselect GPS and tautwire, wait for the status to read offline, then reselect GPS and tautwire. Deselect Artemis, wait for the status to read offline and then reselect Artemis. Deselect tautwire, Artemis and GPS, wait until the status reads offline, then reselect select Artemis, allow vessel model to stabilise, reselect tautwire and GPS.

When using the HPR, what information should you pay attention to?. GPS. GYRO. VRS. Tension sensor.

What is the purpose of the MRU input in a DP system?. To correct the draft for vertical movements. To correct the vessels position for tide and swell. To correct the PRS for vertical movement. To tell the DP system that the vessel is changing position.

You are following a track using the DP autotrack mode and the operator station stops working, what will be the consequences?. The vessel will drift off position. The vessel will continue to follow the track using dead reckoning. The vessel will continue to follow the track. The vessel will stop on track.

You have pressed the thruster start button on the bridge and the thruster is now operational, what signal would you expect to see on the DP screen?. Running, Enabled. Enabled, Ready, Running. Running. Ready, Running.

Whilst manoeuvring at speeds above 5-6 knots, what are the potential hazards?. Thruster interaction. Thrusters less effective. False current. Damage to thrusters.

When using a taut wire, what should you consider?. Working Depth. Transponder frequency. Nature of Seabed. Transponder location.

The vessel is on Auto DP mode and using GPS, HPR and Fanbeam as a position reference system, the HPR starts to drift from the vessel model position and is rejected by the median test, what could be the reason?. The online gyro may be drifting. The VRS may be drifting. The target is selected as a mobile target. The reference origin is drifting.

You are in auto DP and the DP current reading in the bottom right of the posplot display seems unusually high, what could be the reason?. Incorrect measurement from current sensor. Incorrect measurement from tension sensor. Reference origin has drifted. Measured wind speed has increased.

The vessel is in auto DP mode and you observe all of the reference systems drifting away from the position of the vessel model on the ‘refsys’ view, what could be the reason?. Telegram error between the DP system and the position reference system. Position Reference system failure. Unmeasured forces acting on the vessel. Drifting of the reference origin.

What DP software function is used to ensure the vessel does not blackout?. Power Management System. Power distribution system. Power Overload Control. Switchboard Automation.

You are on auto DP and the light above the HPR begins to flash, what could be the reason?. The HPR is working. The transponder is selected to mobile. The HPR has been rejected by a test. The draft input is wrong.

You receive the alarm ‘gyro difference’, what has happened in the DP system?. There are 2 Gyro’s and one has a difference of more than 2 degree’s. There are 3 Gyro’s and one has a difference of more than 2 degree’s. There are 2 Gyro’s and one has a difference of more than 4 degree’s. There are 3 Gyro’s and one has a difference of more than 3 degree’s.

Whilst operating in the DP mode, how does the system work out the DP current?. Measure it using a sensor. Calculate it using the difference between the predicted position and the measured position. Measure it using the comparison between position reference systems. Measuring the forces acting on the vessel and calculate it using this information.

You are manoeuvring in DP Joystick mode and the auto sway button doesn’t work, what could be the reason?. There is no active MRU. The MRU is not working. There are no active PRS. The vessel is moving too fast.

Which of the following inputs are required, as a minimum, to achieve automatic DP control?. PRS gyro. Current. Draft. Hawser.

Which of the following constitute DP control?. Pitch. Yaw sway surge.

The vessel is in the Auto DP mode and you receive an alarm ‘thruster prediction error’ on bow thruster #2, thruster feedback shows 100% to starboard, what immediate action should you take?. Disable the thruster #2 by pressing the button on the DP desk panel. Reset controller B. Call the engine room and ask them to check thruster #2. Press the emergency stop button for thruster #2.

You are on auto DP with the wind sensors deselected, what will happen to the vessel if the wind changes gradually?. The vessel will quickly lose position. The vessel will behave ‘nervously’ and oscillate. The vessel will initially lose position before the change in wind is added to DP current. The vessel will maintain position and the change will be added to DP current.

Which two of the following situations would you deselect the wind sensors?. Working on the Leeside of a platform Carrying out Helicopter Operations. Carrying out diving operations. Working on the windward side of a platform.

The DP has been in auto DP mode for an hour with the wind sensors are enabled, the wind suddenly increases, what effect will this have on the vessel?. Vessel will lose position. Vessel will oscillate using feed back. Vessel will compensate using feed forward. Vessel will compensate using feed back.

What are the advantages of having 3 or more DP controllers?. Compliance with IMO class 3 requirements. Voting. Additional system redundancy. Compliance with DNV class 3 Requirements.

Which of the following are local position reference systems?. Radius HiPap Artemis Taut wire. GNSS.

Consequence Analysis is a software function which will produce an alarm if it predicts the vessel is unable to maintain its position in the event of a single worst failure, what does this software check?. If it is safe to carry out DP operations. An assessment has been made of the environment, Power and thruster systems. All DP system components are working properly. It will ensure that the vessel is complying with DP class regulations.

When using a Fanbeam, what potential hazards should you pay attention to?. Wire Length. Bright flashing lights , Crane work. Frequency.

In the event of total blackout, there must be a UPS back-up power for: The DP consoles and controllers. The DP consoles, controllers, PSR and sensors. The Dp consoles, controllers, PSR, sensors and thrusters. Thrusters and ROV.

Is a drift test accurate?. A drift test done at 500 meters is a formality and has no value at all. A drift test can be wildly inaccurate even if done correctly. Drift test are not accurate at all. If done properly a drift test is accurate but only for the location the vessel is in when completed.

When making a heading change, in auto position mode, the set rate of turn: Will only affect the positioning capability of the vessel in conditions of very high wind and current. Will always affect the positioning capability of the vessel. Will never affect the positioning capability of the vessel. Can sometimes have an effect on the positioning capability of the vessel.

What will affect a vessel DP capability plots?. Loss of one UPS that is A60 isolated. Loss of one out of three Gyros. If the SW/FW plate coolers are party blocked. Loss of more than 2 PRS.

Classification Societies requiere a Power Management System for wich DP classes?. DP calss 2 and 3. DP Class 3 only. DP calss 1 and 2.

The consequence analysis and capability plots are mandatory for wich DP class?. Dp classes 2 and 3. DP 1, 2 and 3.

Select from the list below the PSR systems with longest usable range: Cyscan. GNSS. Fanbeam. Radascan.

Why it is important to have a correct draft input during DP operations?. To avoid grounding in shallow waters. So that the DP system can calculate the correct vessel mass, vessel hydrodynamic characteristics and aerodynamic characteristics. To ensure sufficient under-keel clearance for the ROV to manoeuvre. To adjust Tautwire inputs with respect to davit head heightabove the water line.

What happens if all MRU/VRS fail?. The position reference system input will not compensate for roll and pitch. The DP system will not compensate for wind gusts. The vesse will not be able to maintain position. The vessel is likely to pitch and roll more.

According to IMO MSC. 1/1580, an FMEA should be carried out for: Equipment classes 1 and 2. All DP vessel classes. Equipment classes 2 and 3.

You are on a DP 1 vessel with one bow thruster. The bow thruster fails during operations. Under wich category do you log this failure in the IMCA incident report?. Dp Observation. DP undesired event. DP inicident. Dp Thruster failure.

You are conducting a DP operation wich has a 4-metre position excursion limit that is not to be exceeded. Whitin the DP system, this can be monitored by: The consequence analysis function. Alarms built into the DP software for each type of operation. Position alarm limits set by DPO. The online capability plot.

What is the wind feed forward function on the DP?. The function is isued to prevent the wind sensor for being included in the calculations of the kalman filter. The function is used in conjuction with the wind sensors on the vessel to enable the DP system to automatically compensate for wind gusts. The function is used to feed average wind sensor measurement directly to the dp rather than inputting an average wind. The function is used to ensure that the wind sensors always have first priority in the Dp system.

The following position reference system configuration are available for a DP class 3 operation. Which is the best configuration?. Two DNGSSs and one laser. Three independent systems working on different principles with one connected to back up the DP System. Two laser systems and one DNGSS with no back up. DGNSS, taut wire, and a single HPR system with two transponders.

Excursions about a set point is expected when operating on DP. For a vessel working to DP equipment class 2 which of the following would you expect not to increase the excursions?. A change in the environmental conditions. Position reference sensor variability. Incorrect control system tuning. Loss ah half the available thrusters.

Backup controls should be tested at the following times: Only during FMEA trials. As per the approved ASOG. Every 90 days. Monthly.

According to IMO MSC/Circ. 645 of 1994 section 3.2.4 (unless equivalent integrity of power operation can be accepted according to section 3.1.3) when should bus-tie breakers be open?. During class 1 operations. During class 2 operations. During class 3 operations. During all DP class operations.

A system that can improve station-keeping accuracy in Deep Waters when coupled with (aided by) Hydro accustic systems is: DARPS. Dual GNSS. Deepwater tautwire. Inertial navigation system.

A DP system function that performs calculations to very that sufficient thrust and power is available to maintain position and heading in the event to of a single point failure is called?. The internal DP mode. Thruster allocation; is requiredon classes 1, 2 and 3. The hard copy capability plots. The DP alarm called consequence analysis.

During ROV Operations, Which of the DP positions reference system could the ROV interact and possibility interference with?. Microwave FMCW system. Laser system. The Deep sounder. Taut wire.

A Gangway is in use between a fixed platform and a DP accommodation vessel. Can the Gangway be programmed as a PRS. No, since there is not facility to disconnect in an emergency. Yes. Yes, only if a GPS antenas is availabre at both ends of the Gangway. no.

During DP operations in open Waters one of three stern azimuth thrusters is seen to be providing 50% more thrust feedback than is demanded by the DP, The DP system is compesating for the error by reducing thrust output on the other 2 azimuths. Heading and position are stable. The DPO should: Have the faulty thruster stopped and advise the engineers to check and effect repair. Do nothing, as positioning is stable. Deselect the faulty thruster from the DP operator station and advise engineers to effect repairs. Continue to use the faulty thruster and have the engineers attempt repairs.

What is the main Bus Tie breaker?. The main circuit breaker between the main sections of the swichboard / - THE CIRCUIT BREAKER THAT SEPARATES THE SWITCHBOARDS TO PREVENT COMPLETE BLACKOUTS. The circuit breaker between swichboard and emergency generator. The circuit breaker between generator and swichboard. The circuit breaker between swichboard and the DP UPS.