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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)

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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


Apx 100

APX-100


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


Apx 1001

APX-100


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


Enabling learning objective elo

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


Apx 1002

APX-100


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.


Apx 1003

APX-100


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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