Transponders Flashcards
1
Q
Military 3 modes
A
Mode 1 2 digit ident code slected on control unit
Mode 2 4 digit ident code selected on R/T
Mode 4 Encrypted challenge and reply code
2
Q
Civilian 3 modes
A
Mode 3A 4 digit ident/flight status code selected on control unit
Mode 3C 4 digit code representing uncorrected barometric altitude from DADC system
Mode 3S 4 digit code representing uncorrected barometric altitude from DADC and other pertinent info
3
Q
Transponder codes Not Assigned IFR Aircraft in Low Level Airspace IFR Aircraft in High level airspace VFR at or below 12 500 ASL VFR at or above 12 500 ASL Hijack Comm Failure Emergencies
A
0000 Not Assigned 1000 IFR Aircraft in Low Level Airspace 2000 IFR Aircraft in High level airspace 1200 VFR at or below 12 500 ASL 1400 VFR at or above 12 500 ASL 7500 Hijack 7600 Comm Failure 7700 Emergencies
4
Q
Dash 8 civilian transponder
A
Collins TDR-94/94D (civilian)
- ATC Transponder System
- 2 boxes located in belly of aircraft
- Mode S
- Used in TCAS and transponder
- Provides altitude to ATC as well as aircraft information (make, year
5
Q
Transponder Mode S
A
- Provides data link capability
- 16 million codes – each aircraft has its own unique signature
- Compatible with present ATC beacon system
- Provides additional info to flight crew (clearances and routing, weather and maps)
- Integral component of ACAS (TCAS)
