l/P Operation, Military or Civil

CIVIL position, all other operations re-

master control of the transponder set re-

mains in the EMER position after the

m a i n the same as in the MOD position

( p a r a 23). Additional reply information

transponder set is interrogated by a

necessary for compatibility with civil

g r o u n d - b a s e d IFF system. These signals

will be transmitted automatically, regard-

i n t e r r o g a t i o n s is automatically inserted

less of any mode and function combination

by the transponder set.

previously setup and will provide indica-

tions to the ground-based IFF system that

25. l/P Operation, Military or Civil

the aircraft is in an emergency or distress

(fig. 6)

condition.

T h e pilot may identify the position of

b. Master Switch Operation.

h i s aircraft after being interrogated by

(1) Depress and hold in the emergency

a ground-based IFF system. This type

barrier button.

operation is initiated by the pilot on re-

(2) T u r n the master control to the

ceipt of a request through the aircraft's

EMER position.

communications facility, or on arrival at

(3) R e l e a s e t h e e m e r g e n c y b a r r i e r

p r e - e s t a b l i s h e d checkpoints. The trans-

button.

ponder set will transmit signals indicating

(4) P e r m i t the master control to re-

to the ground-based IFF that a request is

main in the EMER position for the

being made for the aircraft's position. The

duration of the emergency.

following operating procedures are used:

(5) W h e n the emergency is over, re-

a. Procedure No. 1.

turn the master control switch to

(1) To transmit position identifying

the NORM or LOW position as re-

signals, momentarily hold the I/P

quired.

switch in the I/P position.

(2) On completion, release the I/P

27. Monitoring

switch.

(fig. 6)

b. Procedure No. 2 .

(1) P l a c e the I/P switch in the MIC

M o n i t o r the reply pukes, transmitted

by the transponder set, as follows:

position.

a. Place the AUDIO switch in the ON

(2) P r e s s the switch button on the

p o s i t i o n . Transmitted reply pukes, fol-

microphone; the transponder set is

l o w i n g interrogation, will be audible in

n o w transmitting position identi-

the pilot's headset.

fying signals.

b. Immediately following completion of

(3) On completion of identification of

the monitoring procedure, place the AUDIO

p o s i t i o n , release the microphone

switch in the OFF position.

switch button.

(4) P l a c e the I/P switch in the OFF

28. Stopping Procedure

position.

(fig. 6)

Note: The I/P switch may remain in the

MIC position for the duration of a flight.

Set the front panel controls as fol-

This permits position identifying signals

to be transmitted each time the aircraft's

lows :

communication equipment is operated.

Position

Control

26. Emergency Operation

(fig. 6)

Master Control - - - - - - - - - - - - - - - - - - - - - - -

OFF.

AUDIO switch - - - - - - - - - - - - - - - - - - - - - - - -

OFF.

a. General. During an aircraft emer-

I/P switch - - - - - - - - - - - - - - - - - - - - - - - - - -

OFF.

MODE 2 switch ----------------------

g e n c y or distress condition, the trans-

OFF.

MODE 3 switch -----------------------

ponder set may be used to transmit

MODE 1 code control - - - - - - - - - - - - - - - - -

To read 00.

specially coded emergency signals. These

MODE 3 code control - - - - - - - - - - - - - - - - -

To read 00.

NORMAL.

F u n c t i o n control --------------------

emergency signals are automatically

AN/APX-44 circuit breaker - - - - - - - - - - -

OFF.

setup and will be transmitted as long as the