Module 15 part 4

Resistive and capacitive type firewires are tested with. megger/voltmeter. megger/ohmmeter. multimeter.

Fire wire clips have rubber in them to. stop heat transfer to the element. insulate the fire wire electrically. support the wire.

Fire extinguishers work by. combining with remaining oxygen to get rid of it. creating more oxygen. reducing oxygen.

Fire detection systems which are routed through another zone. must be protected by the use of heat sinks. must be protected from heat sources in the zone. are not allowed.

The test switch of a continuous loop detector gives a. continuity check. insulation check. bonding check.

What are the types of continuous fire detection system?. Capacitance. Capacitance and resistance. Inductance and capacitance.

What is the operating principle of the spot detector sensor in a fire detection system?. A conventional thermocouple that produces a current flow. A bimetallic thermoswitch that closes when heatedto a high temperature. Resistant core material that prevents current flow at normal temperatures.

In a fixed fire-extinguishing system, there are two small lines running from the system and exiting overboard. These line exit ports are covered with a blowout type indicator disc. Which of the following statements is true?. When the red indicator disc is missing, it indicates the fire extinguishing system has been normally discharged. When the green indicator disc is missing, it indicates the fire extinguishing system has had a thermal discharge. When the yellow indicator disc is missing, it indicates the fire extinguishing system has been normally discharged.

Two continuous-loop fire detection systems that will not test due to a broken detector element are the. thermocouple system and the Lindberg system. Kidde system and the Fenwal system. Kidde system and the Lindberg system.

Which of the following fire detection systems measures temperature rise compared to a reference temperature?. Lindberg continuous element. Thermocouple. Thermal switch.

A fire involving energized electrical equipment is defined as a. class B fire. class D fire. class C fire.

How are most aircraft turbine engine fire extinguishing systems activated?. Manual remote control valve. Pushrod assembly. Electrically discharged cartridges.

A fire detection system that operates on the rate of temperature rise is a. thermocouple system. thermal switch system. continuous loop system.

Why does one type of Fenwal fire detection system use spot detectors wired in parallel between two separate circuits?. So that a single fault may exist in the system without sounding a false alarm. To provide an installation that is equal to two separate systems: a primary system and a secondary, or back up system. So that a double fault may exist in the system without sounding a false alarm.

How does carbon dioxide (CO2) extinguish an aircraft engine fire?. Lowers the temperature of the air and displaces oxygen. The high pressure spray lowers the temperature and blows out the fire. By lowering the temperature to a point where combustion will not take place.

A fuel or oil fire is defined as a. class B fire. class C fire. class A fire.

Which of the following is the safest fire extinguishing agent to use from a standpoint of toxicity and corrosion hazards?. Bromotrifluoromethane (Halon 1301). Bromochlorodifluoromethane (Halon 1211). Dibromodifluoromethane (Halon 1202).

The explosive cartridge in the discharge valve of a fire extinguisher container is. not a life dated unit. a life dated unit. mechanically fired.

A fire detection system operates on the principle of a buildup of gas pressure within a tube proportional to temperature. Which of the following systems does this statement define?. Thermal switch system. Lindberg continuous element system. Kidde continuous loop system.

The most satisfactory extinguishing agent for an intake fire is. methyl bromide. dry chemical. carbon dioxide.

How is the fire extinguishing agent distributed in the engine section?. Spray nozzles and perforated tubing. Spray nozzles and fluid pumps. Nitrogen pressure and slinger rings.

What is the principle of operation of the continuous loop fire detector system sensor?. Core resistance material which prevents current flow at normal temperatures. A bimetallic thermoswitch which closes when heated to a high temperature. Fuse material which melts at high temperatures.

The fire detection system that uses a single wire surrounded by a continuous string of ceramic beads in a tube is the. Kidde system. thermocouple system. Fenwal system.

The fire detection system that uses two wires imbedded in a ceramic core within a tube is the. Lindberg system. Kidde system. Fenwal system.

A continuous loop fire detector is what type of detector?. Rate of temperature rise detector. Spot detector. Overheat detector.

Which of the following fire detection systems will detect a fire when an element is inoperative but will not test when the test circuit is energized?. The Kidde system and the Fenwal system. The thermocouple system and the Lindberg system. The Kidde system and the thermocouple system.

After a fire is extinguished, or overheat condition removed in aircraft equipped with a Systron Donner fire detector, the detection system. must be manually reset. automatically resets. sensing component must be replaced.

For fire detection and extinguishing purposes, aircraft powerplant areas are divided into fire zones based on. engine type and size. the volume and smoothness of the airflow through engine compartments. hot and cold sections of the engine.

What is the function of a fire detection system?. To discharge the powerplant fire extinguishing system at the origin of the fire. To activate a warning device in the event of a powerplant fire. To identify the location of a powerplant fire.

What retains the nitrogen charge and fire extinguishing agent in a high rate of discharge (HRD) container?. Pressure gauge and cartridge. Breakable disk or fusible disk. Pressure switch and check tee valve.

The use of water on class D fires. will cause the fire to burn more violently and can cause explosions. has no effect. is most effective if sprayed in a fine mist.

The pulling out (or down) of an illuminated fire handle in a typical large jet aircraft fire protection system commonly accomplishes what events?. Closes fuel shutoff, closes hydraulic shutoff, disconnects the generator field, and arms the fire extinguishing system. Closes fuel shutoff, closes hydraulic shutoff, closes the oxygen shutoff, disconnects the generator field, and arms the fire-extinguishing system. Closes all firewall shutoff valves, disconnects the generator, and discharges a fire bottle.

The most satisfactory extinguishing agent for an electrical fire is. carbon tetrachloride. methyl bromide. carbon dioxide.

Which of the following fire detectors are commonly used in the power section of an engine nacelle?. Rate of temperature rise detectors. CO detectors. Smoke detectors.

Which of the following fire detection systems uses heat in the normal testing of the system?. The Kidde system and the Fenwal system. The thermocouple system and the Lindberg system. The thermocouple system and the Fenwal system.

How are extinguisher spray rings checked for freedom from obstruction?. Firing the system. Blowing through with compressed air. Pumping water through the system.

What is used as an extinguishant in fire bottles?. Freon compounds. Halogenated hydrocarbons. Water.

The advantage of the two shot fire bottle system is. one bottle can be discharged after certain time delay from the other bottle. both bottles can be used in either of the engines. one bottle can be used twice.

To check a fire bottle in situ is serviceable. weigh it, check blow out discs, check pressure. check blow out disc only. check blow out disc, pop up indicators, expiry date and pressure.

Resistive type fire-wires are tested using. megger/ohmmeter. ammeter/ohmmeter. megger/voltmeter.

When testing an installed fire bottle. a multimeter used. a lamp and 1.5V cell used. a safety ohmmeter is used.

On checking a fault free fire detection system. use megger as per normal. a megger is never to be used. use a megger only for a short while as it can polarise the element.

3 ways to test serviceability of a fixed fire bottle in situ are. weigh, pressure, blow-out disc. weigh, pressure, pop up indicator. pressure, pop up indicator, blow-out disc.

Omission of crushable washer on engine fire-wire connector will. allow moisture ingress. affect fire wire continuity. affect fire wire capacitance.

Discharge cartridges of the fire bottle have. life time in hours/calendar and replace which ever is longer. life time in hours/or calendar and replace which ever is sooner. no life time it is only replaced when unserviceable.

The Kidde Fault Free Fire detection system has how many internal wires in the sensing element?. 1. 3. 2.

When testing a two pin fire bottle connector. continuity test 1 pin then short two together. short two pins together. continuity test 1 pin, then the other, then short two together.

Gas type fire-wires operate by utilising. the change in the gas pressure. the change in the gas dielectric level. the change in the electrical resistance of the gas.

On a fire bottle, if the indicator pin was protruding, this would indicate. the bottle is under weight. extinguisher had been fired. an over pressure had occurred in the bottle.

When testing a squib on a fire bottle, you use a. multimeter (AVO). low current ohmmeter. lamp and 1.5V cell.

In a two shot fire extinguishing system. extinguishers distributed once to either engine compartment. extinguisher distributed twice to each enginecompartment. one squib can be fired, if that fails then the 2nd squib can be fired.

Methyl Bromide fire extinguisher are installed with neck. horizontal. at the bottom. at the top.

In a Fenwall fire detection system. the tube is inconel and wire is nickel. inner electrode is inconel wire. outer electrode is nickel tube.

When a fire extinguisher is discharged the immediate action is. operate engine to idle. clean with cold water. clean with hot water.

Who establishes the recommended operating time between overhauls (T.B.O) of a gas turbine engine?. The engine manufacturer. The operator (utilizing manufacturer data and trend analysis) working in conjunction with the Airworthiness Authority. The Airworthiness Authority alone.

What is the first engine instrument indication of a successful start of a turbine engine?. A rise in oil pressure. A rise in the engine fuel flow. A rise in the exhaust gas temperature.

A hung start is indicated by the. exhaust gas temperature exceeds specified limits. fails to reach idle RPM. RPM exceeds specified operating speed.

During inspection, turbine engine components exposed to high temperatures may only be marked with such materials as allowed by the manufacturer. These materials generally include. layout dye, commercial felt tip marker or chalk. layout dye, commercial felt tip marker, wax or grease pencil. layout dye, commercial felt tip marker, wax or grease pencil, chalk or graphite lead pencil.

When the leading edge of a first stage turbine blade is found to have stress rupture cracks, which of the following should be suspected?. Faulty cooling shield. Over speed condition. Over temperature condition.

A magnetic chip detector inspection should be carried out. within a specified time from shut down. with engine cold. with engine running.

What is the proper starting sequence for a turbojet engine?. Starter, ignition, fuel. Starter, fuel, ignition. Ignition, starter, fuel.

Foreign object damage on a compressor, when boroscoping, is indicated by. tip curl. nicks and scores. flats.

Turbine blades are generally more susceptible to operating damage than compressor blades because of. higher temperature stresses. higher centrifugal loading. high pressure and high velocity gas flow.

A magnetic chip detector detects. particles held in suspension. particles which are too small for the naked eye. ferrous particles only.

A cool-off period prior to shutdown of a turbine engine is done to. prevent vapor lock in the fuel control and/or fuel lines. prevent seizure of the engine bearings. allow the turbine wheel to cool before the case contracts around it.

When starting a turbine engine, the starter should be disengaged. only after the engine has reached full idle RPM. when the ignition and fuel system are activated. after the engine has reached self-sustaining speed.

What should be done initially if a turbine engine catches fire when starting?. Continue starting attempt in order to blow out the fire. Continue engine start rotation and discharge a fire extinguisher into the intake. Turn off the fuel and continue engine rotation with the starter.

If a turbine engine is unable to reach takeoff E.P.R before its E.G.T limit is reached, this is an indication that the. fuel control must be replaced. E.G.T controller is out of adjustment. compressor may be contaminated or damaged.

Which of the following engine variables is the most critical during turbine engine operation?. Compressor RPM. Turbine inlet temperature. Compressor inlet air temperature.

The recurrent ingestion of dust or other fine airborne particulates into an engine can result in. the need for less frequent abrasive grit cleaning of the engine. foreign object damage to the compressor section. erosion damage to the compressor and turbine sections.

When the engine is not running, and engine blanks are installed. The E.P.R gauge shows 1.0, then. the transmitter is faulty. the receiver is faulty. it is normal.

Which of the following may be used to accomplish internal inspection of an assembled gas turbine engine?. Ultrasound, and fluorescent penetrant and ultraviolet light. X-ray and a borescope. Infrared photography and fluorescent penetrant and ultraviolet light.

Run down time is indicative of. an F.C.U malfunction. compressor malfunction. the freedom of rotation of the compressor.

What would be the possible cause if a gas turbine engine has high exhaust gas temperature, high fuel flow, and low RPM at all engine power settings?. Fuel control out of adjustment. Loose or corroded thermocouple probes for the E.G.T indicator. Turbine damage or loss of turbine efficiency.

Which of the following is the least likely indication of a main bearing failure?. High oil consumption. High oil temperature. High oil pressure.

After shutdown, flames are present in the exhaust pipe. The probable cause is. a defective fuel control unit (F.C.U). a defective pressurizing and dump valve. a defective P cock.

If the L.P cock is used to shutdown an engine. the F.C.U will continue to function. flames will appear in the exhaust. the H.P fuel pump will run dry.

A gas turbine engine is stopped by closing. H.P cock. L.P cock. throttle valve.

The engine accelerates to idling by. gas flow. combined efforts of starter motor and gas flow. starter motor.

An oil emission spectrometer measures. particles in suspension. particles on the surface. specific gravity of the oil.

A broadband vibration reading indicates. the total vibration sensed by the transducer. the peak allowable vibration. the N1 vibration.

Vibration analysers determine which component is vibrating by analysing. voltage. amplitude. frequency.

High frequency vibration. causes engine components to crack. energises air particles prior to compression. can give an indication of a fluctuating (E.P.R).

Engine oil sampling analysis is taken. after engine shut down. at specific time after engine shut down. when oil level is high.

With external power applied, the engine will not run up to idle after reaching starting speed. The likely fault would be with the. Fuel Control Unit. clutch. battery.

When running down an engine. it should be done as slowly as possible to assist thermal stress. it should be done as quickly as possible to stop excess of fuel gathering. it should be done as slowly as possible to reduce thermal stress.

What may be an indication of a bleed valve stuck in the closed position?. Over speed. Low E.G.T reading. Compressor stalling at low RPM.

Excessive E.G.T can. cause N.G.V to creep. cause damage to turbine. cause damage to jet pipe.

A jet engine has a high oil temperature but all other power parameters are normal. The probable cause is. a large quantity of oil being returned to tank. gear box leakage. a main bearing in distress.

A hot start refers to. early ignition. high E.G.T before idle RPM is achieved. too much fuel being supplied.

If a compressor surge occurs, it is recognized by. coughing in the compressor and vibration. fluctuating RPM and fuel flow. fluctuating E.G.T and thrust.

Cracks may occur in hot section components of a turbine engine if they are marked during inspection with. a lead pencil. chalk. layout dye.

What must not be used during an engine compressor wash?. Chlorine. Desalinization solution. Crushed almond.

Trend monitoring of spectrometric oil analysis is carried out how often?. During each scheduled maintenance period. At set periods once the rate of wear has been established. After every repair or modification.

Starting an engine with a bleed valve stuck closed would cause: low E.G.T. possible stalling of the engine. high E.G.T.

Galling is a condition caused by excessive. chafing. scoring. temperatures.

If a burner was down, in a multi-can system, the engine would tend to. hang up. run up. surge.

If the rundown time is less than the minimum stated for a given engine. unacceptable wear is occurring at the main bearings. the rotating assembly is free. the rotating assembly is being restricted.

When running an engine the following lights should be on: anti-collision and nav-lights (if fitted). nav-lights (if fitted). anti-collision (if fitted).

With spectral oil analysis program (S.O.A.P), samples are taken. when the oil tank is full. at a specified interval. when the oil is warm.

During start, if a bleed valve is stuck closed. E.G.T is unaffected. E.G.T will be higher than normal. E.G.T will be lower than normal.

Dynamic balance testing locates unbalance in. all planes. two planes. one plane.

A rotation pad on an accessory drive gear box is provided for. N2 rotation. both are correct. alternate tachogenerator fitment.

What would be indicative of a hung start?. Starter would fail to disengage. High E.G.T. Engine would fail to reach self sustaining speed.

Fuel system inhibiting oil is. mineral oil. light anti-freeze oil. kerosene.

After placing an engine in an M.V.P envelope. check humidity indicator after 12 hours. check humidity indicator after 24 hours. check humidity indicator after 48 hours.

On a vapour proof cocoon, there is a. temperature indicator. moisture indicator. humidifier.

When an installed engine is not to be used for a period of up to 7 days. it is necessary to inhibit the engine. it is only necessary to blank off all apertures. run the engine as prescribed in the Flight Manual.

Installed engines must be re-preserved after preservation at least every. six weeks. six days. six months.

On storage of an engine, the desiccant is. looked at within 24 hrs if its blue its OK. looked at 24 hrs later if its blue its OK. looked at 24 hrs later if blue it should be replaced.

After placing an engine into storage, details would be recorded in. Technical Log. Engine log book. Aircraft log book.

When storing an engine the fuel system is to be inhibited. How is this done?. Remove plugs rotate engine then add oil. Rotate engine whilst adding oil then remove plugs. Add oil leaving plugs in.

An engine in storage for 7 days should. have storage oil placed in engine. be run twice in that week. be fitted with covers and blanks and apertures covered.

On a (VP) cocoon bag, if the humidity indicator turns pink/lilac. desiccant is effective and does not need changing. desiccant is ineffective and needs changing. desiccant is changed weekly.

To inhibit the fuel system of an installed engine. pump oil into the engine when stationary. dry motor the engine. remove the ignitor plugs.

When is the humidity indicator checked on a preserved engine?. 1 Month. 1 Year. 6 Months.

With an engine in storage, desiccant is used. as an insecticide. as a corrosion inhibitor. to remove moisture from the air.

Small cuts in a M.V.P. engine storage bag can be repaired. with adhesive PVC tape. by vulcanising. by replacing M.V.P.

When removing an engine for long-term storage, bleed valves should be. removed. locked closed. open but blanked.

The types of water present in aviation fuel are. free and entrained both harmful. free that is harmful and entrained that is harmless. free that is harmless and entrained that is harmful.

Oil pressure and scavenge pumps are usually. spur gear pumps. multi-plunger pumps. diaphragm pumps.

The purpose of a pressure filter in a lubrication system is to. protect the pressure pump. protect the oil jets. protect the scavenge pumps.

A curvic coupling. converts rotary motion to reciprocating motion. absorbs misalignment between the driving and driven shafts. accurately aligns the driving and the driven shafts.

Feeders are. conduits used to carry electrical cable. fluid supply hoses. heavy duty electrical generator cables.

High air humidity will. have no affect on thrust. reduce the thrust output. increase the thrust output.

C.I.T sensor is made up of. Iron-constantan. Chromel-alumel. Platinum-rhodium.

What is the maximum value of pressure with reference to a jet engine?. 1 Bar. 1 Kg/cm. 1 Atmospheric Pressure.

Centrifugal compressor maximum tip speed is. 8 Mach. 2 Mach. 5 Mach.

What type of oil is used in a gas turbine engine?. Synthetic. Phosphate Ester. Mineral.