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Aircraft Survivability Equipment

Aircraft Survivability Equipment. REFERENCES. Aircraft Operator’s Manual DOD AIMS 86-100, Mode 4 Handbook, May 1987. OUTLINE. Mode 4 IFF Overview of IFF AN/APX-100 Control Panel Mode 4 Operations Shutdown Procedures. 2. Aircraft transponder receives signal.

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Aircraft Survivability Equipment

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  1. Aircraft Survivability Equipment

  2. REFERENCES Aircraft Operator’s Manual DOD AIMS 86-100, Mode 4 Handbook, May 1987

  3. OUTLINE • Mode 4 IFF • Overview of IFF • AN/APX-100 Control Panel • Mode 4 Operations • Shutdown Procedures

  4. 2. Aircraft transponder receives signal 3. If the interrogation is compatible, the transponder will transmit a time-coded reply PRINCIPLES OF IFF Mode 4 IFF is a secure means of identification 1. Interrogator transmits computer generated interrogation signal

  5. TEST TEST/MON TOP N O G O G O A N T DIV EMER NORM STBY OFF BOT RAD TEST TEST M-3/A M-1 M-2 M-C OUT ZERO B A HOLD L I G H T TEST AUDIO REPLY O N IDENT O U T OUT OUT MIC MODE 1 MODE 3/A STATUS MODE 4 CODE ALT KIT ANT 6 7 1 1 2 4 MODE 2 MODE 2

  6. RAD TEST M-1 M-2 M-C M-3/A OUT MODE 4 ZERO B A HOLD AUDIO TEST REPLY L I G H T O N OUT OUT MODE 4 IFF Rad Test Switch TEST CODE Mode 4 Reply Light Mode 4 Audio/Out/Light switch Mode 4 Code Switch Mode 4 On/Out Switch

  7. TEST O N OUT ZERO B A HOLD MODE 4 MODE 4 OPERATIONS Mode 4 Code Switch RAD TEST TEST M-3/A M-C M-1 M-2 OUT AUDIO REPLY LIGHT OUT 1. Selects Mode A/B - In the A or B position, the switch selects the corresponding Mode 4 operational key 2. Enable Mode 4 hold - In the ‘HOLD’ position, switch activates the hold circuits. Code hold circuits prevent the loss of the Mode 4 key if power is removed from the system. 3. Zeroizes Mode 4 - In the zero position, Mode 4 is zeroized

  8. ZERO B A HOLD TEST O N OUT TEST MODE 4 MODE 4 OPERATIONS Mode 4 On/Out Switch RAD TEST M-3/A M-C M-1 M-2 OUT AUDIO REPLY LIGHT OUT 1. ON Position - Used to allow transponder to reply to a compatible Mode 4 interrogation. Switch must be in the “ON” position before aircraft can generate a Mode 4 reply 2. OUT Position - With the switch in the “OUT” position and the Mode 4 otherwise functional, the computer will not generate a reply to a compatible interrogation.

  9. ZERO B A HOLD TEST AUDIO O N LIGHT OUT TEST OUT MODE 4 MODE 4 OPERATIONS Mode 4 Audio/Out/Light Switch RAD TEST M-3/A M-C M-1 M-2 OUT REPLY 1. AUDIO - In the audio position, Mode 4 reply light and audio are enabled 2. OUT - In the Out position, both the reply light and the audio are disabled. The pres-to-test light is also disabled. 3. LIGHT - In the light position, Mode 4 reply light is enabled and the audio is disabled

  10. TEST O N REPLY OUT TEST MODE 4 MODE 4 OPERATIONS Mode 4 Reply Light RAD TEST M-3/A M-C M-1 M-2 OUT ZERO B A HOLD AUDIO LIGHT OUT The reply light provides a visual indication that Mode 4 replies are being transmitted. Reply light will only function when the audio/out/light switch is in either the audio or light position.

  11. AN/APX-72 AN/APX-64 AN/APX-100 AN/APX-101 Compatible Mode 4 Key Received Incompatible Mode 4 Key Received Tone Tone Tone Tone MODE 4 OPERATIONS Mode 4 Audio Tone With most transponders, audio indicates that you have been interrogated by a Mode 4 key compatible with the key in your transponder computer. ** “Compatible” - Indicates a key that matches that of your transponder ** “Valid”- Indicates a key that is theoretically possible but not the correct Mode 4 key for the period NOTE: A tone in the headset of AN/APX-100 means that you have been interrogated by a valid but incompatible Mode 4 key

  12. MASTER CAUTION IFF MODE 4 CAUTION LIGHT Every transponder is equipped with a Mode 4 caution light Illumination of the caution light will indicate: 1. Transponder computer is installed, with power applied, but is not loaded with a vaild Mode 4 key. 2. The transponder computer has failed its self-test cycle. 3. A compatible Mode 4 interrogation was received but no Mode 4 reply was transmitted This occurs if: - The transponder system is in standby - The Mode 4 On/Out switch is in the Out position - A malfunction in the receiver/transmitter will not allow the Mode 4 reply to be transmitted or transmits the reply at low power **NOTE: Fault 1 or 2 will result in a steady illumination of the IFF caution light. Fault 3 may result in the IFF caution light cycling On and Off depending on the recurrence of the interrogations**

  13. TEST TEST/MON TOP N O G O G O A N T DIV EMER NORM STBY OFF BOT RAD TEST TEST M-3/A M-1 M-2 M-C OUT ZERO B A HOLD L I G H T TEST AUDIO REPLY O N IDENT O U T OUT OUT MIC MODE 1 MODE 3/A STATUS MODE 4 CODE ALT KIT ANT 6 7 1 1 2 4 MODE 2 MODE 2

  14. AN/APX-100 SHUTDOWN • To Retain Mode 4 code: • 1) MODE 4 CODE switch - Rotate to HOLD • 2) Wait 15 Seconds • 3) MASTER Switch - OFF • To zeroize Mode 4 code: • 1) MODE 4 CODE switch - Rotate to ZERO • 2) MASTER Switch - OFF

  15. TEST TEST/MON TOP N O G O G O A N T DIV EMER NORM STBY OFF BOT RAD TEST TEST M-3/A M-1 M-2 M-C OUT ZERO B A HOLD L I G H T TEST AUDIO REPLY O N IDENT O U T OUT OUT MIC MODE 1 MODE 3/A MASTER STATUS MODE 4 CODE ALT KIT ANT 6 7 1 1 2 4 MODE 2 MODE 2

  16. QUESTIONS?

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