CNS/ATM Flashcards
What is required to control the RINU-Gs from the NAV/COMM CDU?
The pilot or copilot CDU must be powered on.
How are the RINU-Gs controlled?
Through the CDU-7000
RINU-G will shut down when the aircraft battery falls below_______.
17.5 Vdc
What are the three primary functions of the RINU-G
- Determines attitude and horizontal velocities of the aircraft.
- Determines the ground speed and drift angle of the aircraft.
- Determines the ground speed and drift angle of the aircraft.
What information does the GEM V module compute?
Position
Velocity
Time
Formats
What are two functions of the
GEM V module?
Receiver Autonomous Integrity Monitoring(RAIM)
Fault Detection Exclusion(FDE)
The CDU will currently only display data for _____ satellites, even though the receiver may be using up to _______.
5, 12
What is Fault Detection Exclusion?
Ability of the receiver to detect and exclude a bad satellite from navigation solution.
How many satellites are required for FDE?
Requires receiver be tracking minimum of SIX satellites.
What is RAIM?
Receiver Autonomous Integrity Monitoring
Ability of receiver to determine if the integrity of NAV solution meets requirements for the phase of flight.
How many satellites are required for RAIM?
Requires receiver to be tracking 5 satellites.
What are the APX118/123 circuit breakers?
FLC lower
- IFF Power
- Zero IFF
What are the IFF modes with
APX-123?
1, 2, 3A, C, S, 4, 5, emergency
Mode 1
APX-123
- military
- 4,096 codes
Mode 2
APX-123
- military
- platform ID/ sortie ID
- 4,096 codes
Mode 3/A
APX-123
- civilian
- temporary platform ID code assigned by controlling agencies
- used primarily for airspace management
- 4,096 codes
Mode C
APX-123
- civilian
- pressure altitude code
- 1,280 codes in 100 ft. Increments
Mode S
APX-123
- Civilian
- selective interrogation
- permanent address for each A/C
- level 2 elementary surveillance & enhanced surveillance
Mode 4
APX-123
- military
- true IFF
- crypto is valid for 24 hours
Mode 5
APX-123
- military
- new crypto based ID with improved Information Assurance
- mode 5 unique data
What is mode 5 unique data?
- national origin
- mission code
- 14 bit platform ID number
- position
- secure transmission of mode 1,2,3/A, C
What are the two levels of mode 5?
Level 1: challenge and reply
Level 2: position reporting
How is altitude data passed from the CDU-7000 to the transponder(APX-123)?
1553 data bus
WRA GO one flash
Receiver/ Transmitter SRA A1
WRA GO 2 flashes
Single board computer SRA 2
WRA GO 3 flashes
Mode 4/5 Crypto SRA A3
WRA GO four flashes
Signal processor SRA A4
WRA GO five flashes
Power supply SRA PS1
WRA GO six flashes
Inop crypto
Return to depot for further investigation
How soon must the APX-123 battery be replaced after a low battery indication?
2 weeks
What 3 fuses are the front of the APX-123 transponder?
115 Vac
115 Vac RTN
28 Vdc
What happens if the J1 connector on the APX-123 is removed?
Transponder enters sleep mode. Keys in the mode 4/5 crypto SRA are zeroized and TOD is lost.
What are the two levels of mode S operation?
APX-118
Elementary Surveillance (ELS) Enhanced Surveillance (EHS)
Elementary Surveillance information
APX-118
24-bit mode S address
Mode C altitude
Aircraft ID (call sign )
Mode S EHS information
APX-118
ELS info Mag. Heading Indicated airspeed Mach number Vertical rate Roll angle Track angle True track angle Ground speed Selected altitude
Where is the mode S address stored?
CDU-7000 non volatile memory
How is the source of altitude information for the transponder determined?
Determined by course selection on pilot EFDS display control panel.
