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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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Presentation Transcript
references
REFERENCES

Aircraft Operator’s Manual

DOD AIMS 86-100, Mode 4 Handbook, May 1987

outline
OUTLINE
  • Mode 4 IFF
    • Overview of IFF
    • AN/APX-100 Control Panel
    • Mode 4 Operations
    • Shutdown Procedures
principles of iff

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

slide5

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

slide6

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

mode 4 operations

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

mode 4 operations1

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.

mode 4 operations2

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

mode 4 operations3

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.

mode 4 operations4

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

mode 4 caution light

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**

slide13

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

an apx 100 shutdown
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
slide15

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