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ENABLING LEARNING OBJECTIVE (ELO). ACTION: Identify Mark XII (Mode 4) IFF capabilities and limitations. CONDITION: Given a list of cockpit Mode 4 equipment settings and combat flight environment. STANDARD: IAW student reference materials. MARK XII CAPABILITIES.

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enabling learning objective elo
ENABLING LEARNING OBJECTIVE (ELO)
  • ACTION: Identify Mark XII (Mode 4) IFF capabilities and limitations.
  • CONDITION: Given a list of cockpit Mode 4 equipment settings and combat flight environment.
  • STANDARD: IAW student reference materials.
mark xii capabilities
MARK XII CAPABILITIES
  • Returns a coded reply to (SIF) using modes 1, 2, 3/A and C and provides Mode 4 identification friend or foe (IFF).
  • Mode 4 is secure mode of identification.
  • SIF Modes 1 and 2 used by military.
  • Modes 3/A and C used by civilian and military ATC.
mode function normal position
MODE FUNCTION (NORMAL POSITION)
  • Mode 4 Code Switch- Switch selects the A or B Mode 4 Operational Key.
    • A Position selects current 24-hour crypto period
    • B Position selects the next 24-hour period
      • Used when unable to land for re-keying
      • Crypto changes at 2400 hrs ZULU
a b code use
A-B CODE USE
  • COMPATIBLE CODE - Interrogator’s and aircraft key matches & provides IFF.
  • VALID CODE
    • Key is possible, but not the correct key
    • VALID CODE CANNOT provide friendly IFF
transponder characteristics
TRANSPONDER CHARACTERISTICS
  • The investigation into the F-15 shootdown of Army Blackhawk helicopters determined design characteristics which could present HAZARDOUS OPERATIONAL IMPLICATIONS.
  • Associated with the use of the AUDIO/LIGHT/OUT SWITCH
  • ANTENNA SELECT SWITCH
audio out light switch
AUDIO/OUT/LIGHT SWITCH
  • Controls the ALERT INDICATORS for MODE 4 OPERATIONS.
  • AUDIO POSITION enables AUDIO TONE and REPLY LIGHT
    • COMPATIBLE CODES. A Green reply light indicates Friendly IFF response
    • VALID CODES. A Non Response will be indicated by a 400 Hz Tone
mode function standby position
MODE FUNCTION (STANDBY POSITION)
  • Only when COMPATIBLE CODES are used by the interrogator.
  • IFF CAUTION LIGHT illuminates
audio switch out position
AUDIO SWITCH (OUT POSITION)
  • Disables
    • Mode 4 REPLY LIGHT
    • Mode 4 AUDIO TONE
    • PRESS-TO-TEST Mode 4 REPLY LIGHT
    • IFF CAUTION LIGHT
audio switch light position
AUDIO SWITCHLIGHT POSITION
  • Mode 4 REPLY LIGHT enabled
  • MODE 4 AUDIO tone is disabled
    • IFF RESPONSE. The green REPLY LIGHT will illuminate to indicate IFF was given
    • NON RESPONSE to IFF will not be indicated by the 400 Hz AUDIO TONE
slide12
NOTE: PLACE THE AUDIO/LIGHT/OUT SWITCH IN THE AUDIO POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT POSITION
antenna select switch top bot div
ANTENNA SELECT SWITCH(TOP, BOT, & DIV)
  • TOP - The transponder will respond to interrogations from that antenna
  • BOTTOM (BOT) - Responses allowed from the bottom antenna
  • DIVERSITY (DIV) - The transponder will respond through the antenna receiving the STRONGEST SIGNAL
div position
DIV POSITION
  • Place the TOP/BOT/DIV switch in the DIV position during flight operations.
  • Do not use the TOP or BOT position.
  • This does not preclude using the TOP or BOT switch position for ground-based system checks.
mode 4 on out switch
MODE 4 ON/OUT SWITCH
  • MODE 4 ON/OUT SWITCH IN THE OUT POSTION
    • ALL AUDIO AND VISUAL INDICATIONS CEASE ( IN COCKPIT & IFF RESPONSES)
    • IFF CAUTION LIGHT ILLUMINATES WITH THE FREQUENCY OF “COMPATIBLE” INTERROGATIONS.
iff caution light
IFF CAUTION LIGHT
  • ACTIVATED WHEN:
    • KIT 1A/C Not Keyed (steady IFF).
    • TRANSPONDER SELF-TEST FAILURE (STEADY).
    • COMPATIBLE INTERROGATION RECEIVED WHILE IN STANDBY POSITION (FLASHES INTERMITTENTLY WITH INTERROGATIONS).
iff caution light cont d
IFF CAUTION LIGHT (CONT’D)
  • ACTIVATED WHEN (CONT’D):
    • A MALFUNCTION OF THE TRANSMITTER.
      • LOW POWER
      • INTERMITTENT IFF CAUT WITH EACH ATTEMPTED INTERROGATION
    • MODE 4 IS IN THE OUT POSITION.
      • ALL AUDIO AND VISUAL INDICATIONS CEASE. INTERMITTENT BLINKING.
tactical operations
TACTICAL OPERATIONS
  • CROSS-FLOT
    • TRANSPONDER ON/OFF LINES.
      • NORMAL/MODE 4 ON (BEACONING)
      • OMNI-DIRECTIONAL SIGNAL GIVING AWAY LOCATION AND MISSION.
    • FORMATION FLIGHT
      • ONLY ONE AIRCRAFT USES NORMAL
      • ALL OTHERS USE STBY TO PREVENT “TONE-BLANKING” or “REPLY GARBLING”
summary 1
SUMMARY #1
  • Under what conditions will the IFF CAUTION LIGHT cycle ON/OFF, depending on the recurrence of Mode 4 IFF interrogations?
summary 2
SUMMARY # 2
  • Under what condition/s should the APX-100(v) be operated in the STANDBY Position?
summary 3
SUMMARY # 3
  • With the APX-100(V) set to NORMAL and Audio/Light/Out Switch in the LIGHT POSITION, the receipt of a “valid code” would be indicated how?
summary 4
SUMMARY # 4
  • With the APX-100(V) set to NORMAL and AUDIO positions, receipt of “compatible codes” Mode 4 interrogations would be indicated by?
summary 5
SUMMARY # 5
  • The design characteristics of the APX-100(V) transponder can present hazardous operational implications unless the AUDIO/LIGHT/OUT switch and the ANT TOP/DIV/BOT switch are placed into which positions?
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