CS

Select from the following set of sentences concerning the Auxiliary Systems, the sentence(s) you 10 believe are true: FALTAN RESP. THE ELT MESSAGE INCLUDES ALWAYS THE AIRCRAFT’S GPS POSITION. THE COOSAS-SARSAT LOW EARTH ORBITING SATELLITES PROVIDE IMMEDIATE TRANSMISSION DETECTION. THE CVR RECORDS THE CREW’S MICROPHONE AUDIO SIGNALS EVEN IF THE CORRESPONDING PTT SWITCHES ARE NOT ACTIVATED. THE PASSENGER ADDRESS SYSTEM POWER IS IMMEDIATELY DISCONNECTED AFTER THE SHUTDOWN OR FAILURE OF ALL ENGINES AND AUXILIARY POWER UNITS. THE ELT CANNOT BE MANUALLY ACTIVATED BY THE PILOTS. THE PASSENGER ADDRESS TRANSMISSION CAN BE ACTIVATED ONLY THROUGH THE AUDIO MANAGEMENT SYSTEM. THE CVR RECORDS A TIME REFERENCE FOR SYNCHRONIZATION WITH THE FDR DATA. THE PASSENGER ADDRESS INSTALLATION IS MANDATORY FOR ALL AIRCRAFT. THE UNIQUE IDENTIFICATION OF EACH ELT IS REPRESENTED AS A STRING OF 15 HEX CHARACTERS. THE CVR INSTALLATION INCLUDES AUTOMATIC MEANS TO STOP THE RECORDER AND PREVENT.

Select from the following set of sentences concerning the Audio Management System, the sentence(s) you believe are true: The AMS audio bandwidth must be maintained between 300 and 3000Hz. The interphone transmission can be activated using only the PTT switch. The VOX function can be used for radio transmissions. The switches for loudspeaker and mask microphone connection are located outside the Audio Control Panels in some implementations. The binaural capability is available for the pilots in many aircrafts. The modern aircraft includes a Wireless Intercom system for interphone communications between cockpit crew members.

Select from the following set of sentences concerning the Audio Management System, the sentence(s) you believe are true: The AMS audio bandwidth must be maintained between 300 and 3000 Hz. The interphone transmission can be activated using only the PTT switch. The aural alert reception must be activated by the operators using their Audio Control Panels. The switches for loudspeaker and mask microphone connection are located outside the Audio Control Panels in some implementations. The VOX function can be used for radio transmissions. The mask microphone can be used for one operator at the same time as the integral headset microphone. (MASI’10 Q30). The binaural capability is available for the pilots in many aircrafts.

Select from the following set of sentences concerning the Auxiliary Systems, the sentence(s) you believe are true: The ELT message includes always the aircraft GPS position. The COSPAS-SARSAT Low Earth Orbiting satellites provide immediate transmission detection. (MASI’13 Q51). The CVR records the crew’s microphone audio signals even if the corresponding PTT switches are not activated. (MASI’13 Q54). The Passenger Address system power is immediately disconnected after the shutdown or failure of all engines and auxiliary power units. The CVR records a time reference for synchronization with the FDR data. The ELT cannot be manually activated by the pilots. The CVR installation is mandatory for all aircraft. The unique identification of each ELT is represented as a string of 15 Hex characters. The CVR installation includes an automatic means to stop the recorder and prevent the erasure feature from functioning within 10 minutes after crash impact. The Passenger Address transmission can be activated only though the Audio Management System.

Select from the following set of sentences concerning the High Frequency (HF) communication system, the sentence(s) you believe are true: HF communication system provides short-distance /up to the line of sight communications, complementary to satellite communications providing long-distance (over the horizon) communications. HF communication system provides short-distance /up to the line of sight communications, complementary to satellite communications providing long-distance (over the horizon) communications. Availability of radio channels is semi-random, which makes the use of automated HG systems (ACS, ALE, ALM...) highly recommended to reduce pilot/user interface requirements. The HF Datalink (HFDL) system, which follows a layered protocol with the OSI reference model, is still in process for standardization at ICAO. Simultaneous operation (SIMOP) makes reference to the simultaneous civil/military use of HF channels.

Select, from the following set of sentences concerning the Satellite Communications (SATCOM) system, the sentence(s) you believe are true: Iridium coverage does not include the polar regions. The antenna system has to provide for any aircraft a minimum value for the G/T figure of merit, being this minimum value -19dB/K over the 85% of coverage. The AMSS service in the L band has priority over non AMSS services and the capability of pre- emption in this band. ICAOapproved safety services are currently supported worldwide by Inmarsat and Iridium, and in North America by the American Mobile Satellite Consortium (AMSC) and Telesat Mobile Inc. (TIM).

Select, from the following set of Electronic Warfare systems, which of them you believe are passive systems: Intercept (ESM). Encryption (ECCM).

Assume you receive a requirement from the French Air Force to install a protected communication system operating in the UHF band. Select those response(s) which fulfill that requirement: One V/UHF transponder qualified for SINCGARS operation and one antenna. One V/UHF transponder qualified for PR4G standard with embedded COMSEC device. One V/UHF radio qualified for HAVE QUICK. One V/UHF radio and an external SELCAL cryptographic device.

the pilot’s report the following sentence: "... the aircraft was flying 15000 ft AGL just over Getafe Tower and my copilot did not got any response from Torrejon Combat Operations Center, located about 30 km away, despite he made three calls on 317.275 MHz ...". Select those sentence(s) you believe are true: Link distance is likely to be the cause of this communication loss. It would be wise to investigate possible faults on the antenna or RF wiring.

Assume your aircraft mission requires periodic reporting of A/C position and system’s health data. Up to now, this reporting is performed verbally by the flight crew, and now you intend to get an automatic broadcast, by introducing the minimum changes to the existing UHF radio installation. Broadcast data will consist in aircraft position (Lat./Lon.) reports, sent every 10 seconds, plus a 5 Kb text file including aircraft systems’ health data sent every 2 minutes. Which aspects of the current installation are likely to be reassessed? Select those sentence(s) you believe are true: Data terminal interfaces. Radio cooling. Antenna siting. Squelch control. Bandwidth of the radio audio output. PTT Circuitry.

Select, from the following set of sentences concerning the future communication infrastructure that at this moment is under development (SESAR programme, European ATM Masterplan / NextGen – FAA), the sentence(s) you believe are true. The new (medium term) terrestrial datalink will be designed and developed in the UHF band. Operation in the VHF band would be preferred but VHF band is heavily congested. Thus, L-band is the next best candidate for propagation characteristics. Communications system for airport surface (AeroMACS) is based on optical fiber connections because the high data rate communications in C-band. One of the key concept is the Business/Mission Trajectory principle in which the airspace users, Air Navigation Service Providers (ANSP) and airport operators define together, through a collaborative process, the optimal flight path from gate to gate. Systems to be developed: L-Band data link (L-DACS), AeroMACS and New SATCOM services.

Select, from the following set of sentences, concerning the integration and operation of the Satellite Communication System, the sentence(s) that you believe are true: A SATCOM system requires always the integration of a specific and dedicated control panel that is typically located at the cockpit of the aircraft to control the SATCOM system. Satellite avionics (AES) though a distributed avionic topology: Control functions in the cockpit, bulk processing, power and electronics in avionics bay, and racking arrangement in standard racks. Ground installations and equipment through a mobile network: Earth station for Inmarsat (or similar) is very specific, parabolic dishes greater than 7 m diameter, tracking and control antenna equipment and electronic transmitter and receiver circuits. Modular functions: Integrated antenna system (antenna, diplexer/LNA, HPA),Transceiver avionics (Transceiver, SDU), and cockpit/passengers interfaces. SATCOM architecture specification (avionics and antenna subsystems) through ARINC 741/781. List of equipment involved: High Gain Antenna (HGA), Beam Steering Unit (BSU), Diplexer/Low Noise Amplifier (D/LNA), High Power Amplifier (HPA), Satellite Data Unit (SDU), Audio Control Panel (ACP), Multi-Control Display Unit (MCDU), Air Data Inertial Reference System (ADIRS), Air Traffic Services Unit (ATSU), Centralized Fault Display Interface Unit (CFDIU), System Data Acquisition Concentrator (SDAC), Cabin Telecommunication Unit (CTU), and Electrical supply.

Select, from the following set of sentences, concerning the High Frequency (HF) communication system, the sentence(s) that you believe are true: The range for HF communications is mainly due to the low attenuation of the ground wave at these frequencies. HF communication system provides short-distance (up to the line of sight) communications, complementary to satellite communications providing long-distance (over the horizon) communications. Frequencies for a Major Work Air Route Area (MWARA) are chosen over adjacent channels, in order to provide a worldwide optimal division of the available HF bandwidth. Considering spectral efficiency and energy efficiency, the modulation used for the HF system is a double sideband (DSB) full carrier amplitude modulation. K index, solar flux F10.7 index and ionospheric maps allow to know the state of ionosphere and are useful for link performance prediction (by means of different prediction models). Availability of radio channels is semi-random, which makes the use of automated HG systems (ACS, ALE, ALM...) highly recommended to reduce pilot/user interface requirements. HF radio band goes from 3 to 30 MHz (wavelengths of 10 to 100 m) HF radio provides long-distance (over the horizon, without line-of-sight) mobile communications. HF radio provides extensive range propagation with low loss by means of reflection at different layers of the ionosphere. Disadvantages are: Available bandwidth is relatively reduced, availability of channels is not deterministic (depends on Ionospheric conditions), and high sensitivity to interferences. Availability of radio channels depends on: the state of the ionosphere, the range and respective location of radio stations and the interferences and definition of some important frequencies: Lowest Usable Frequency (LUF) and Maximum Usable Frequency (MUF). Major Work Air Route Areas (MWARA) are introduced to separate geographical areas with their own ground stations with a number of frequency channels, chosen to minimize interference into adjacent MWARAs and to give a broad range of available channels.

Select, from the following set of sentences concerning HF antennas, the sentence(s) that you believe are true: The typical number of HF antennas in commercial aircrafts is 3, the same as for VHF/UHF antennas. Operation at wavelengths between 10 and 100 m. Omni-directional (ideally isotropic). Antenna couplers are used to connect the radio to the antenna. Different topologies are deployed: Wireline, probe antennas, cap antennas, shunt antennas, notch antennas, loop antennas or Towel bar. Simultaneous operation (SIMOP) means dual HF systems: two separate antennas, two frequencies. Typically one system is used to transmit and the other to receive. SIMOP band pass filters in conjunction with transmitters with good wideband noise performance is used to avoid problem of interferences between HF radios. Typical frequency separation between HF radios is 1 MHz under 10 MHz and 10% separation from 10 to 30 MHz.

Select, from the following set of sentence concerning the Aeronautical Telecommunication Network (ATN), the sentence(s) you believe are true: Note: There is a similar question in the MASI 22 exam (asking for ATN) but different formulated. Possibilities of this exam question are a/b/c/d (option B is the correct one). Additional options are included. Does not allow VHF subnetwork to interconnect the aircraft with the AOC. Offers a reliable, robust and high-integrity communication service between two network elements (fixed or mobile). Is a fixed service. Only provide analog services. Subnetworks are, along with Intermediate Systems (IS) (or ATN routers) and End Systems (ES), one of the parts of the ATN model, and have to be designed according to the protocol layers of the ATN model. The ATN/OSI model became the standard solution because this solution was highly supported by the industry. Context Management (CM), Flight Information Services (FIS) and Controller Pilot Data Link Communications (CPDLC) are three examples of ATN applications. The ATN is a global networking infrastructure to exchange digital data for the safety of air navigation and for the regular, efficient and economic operation of air traffic services. ATN allows ground/ground, air/ground, and avionic data subnetworks to interoperate by adopting common interface services and protocols. ATN must provide: Traffic priorities at different layers, different routing strategies, point-to-point, point-to-multipoint, multipoint-tomultipoint and broadcast communications, and QoS. The ATN/IPS is based on TCP/IP protocols ATN based on OSI receive limited support by industry.

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