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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


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 POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT POSITION(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


Apx 1002
APX-100 POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT POSITION


Div position
DIV POSITION POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT 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.


Apx 1003
APX-100 POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT POSITION


Mode 4 on out switch
MODE 4 ON/OUT SWITCH POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT POSITION

  • 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 POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT POSITION

  • 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) POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT POSITION

  • 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 POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT POSITION

  • 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 POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT POSITION

  • Under what conditions will the IFF CAUTION LIGHT cycle ON/OFF, depending on the recurrence of Mode 4 IFF interrogations?


Summary 2
SUMMARY # 2 POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT POSITION

  • Under what condition/s should the APX-100(v) be operated in the STANDBY Position?


Summary 3
SUMMARY # 3 POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT POSITION

  • 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 POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT POSITION

  • 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 POSITION DURING FLIGHT OPERATIONS. DO NOT USE THE OUT POSITION

  • 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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