TM 55-1520-228-10
Change 11 3-27
(2) Mode and code – Select as required.
(3) Test as required.
(4) MASTER control – LOW, NORM, EMER as
required.
(5) IDENT – As required.
b. Stopping Procedure. MASTER control – OFF.
3-59. C TRANSPONDER SET – AN/
APX-100.
a. Description. The transponder set AN/APX-100,
enables the helicopter to identify itself automatically
when properly challenged by friendly surface and air-
borne radar equipment. The control panel (figure 3-14),
located on the instrument panel, enables the set to oper-
ate in modes 1, 2, 3A, 4, C, and test. When computer
KIT-1A(-1C)/TSEC (classified) is installed, mode 4 is
operational. The range of the receiver-transmitter is lim-
ited to line-of-site transmission since its frequency of
operation is in the UHF band making range dependent
on altitude. The Mode 4 codes can be mechanically
retained. On the instrument Panel and Console – place
the HOLD-OFF switch to the HOLD position. On the
Transponder Set Control Panel – turn the CODE switch
to HOLD (only momentary action is required). Turn the
master switch or helicopter power off.
b. Controls and Functions. Refer to figure 3-14.
c. Operating Procedures.
(1) Transponder Operation.
(a) MASTER control – STBY. Allow
approximately 2 minutes for warmup.
(b) MODE and CODE – Select as required.
(c) TEST – As required.
(d) MASTER control – NORM or EMER as
required.
(e) ANT – As desired.
(f) IDENT – As required.
(2) Emergency Operation. MASTER control –
EMER.
(3) Stopping Procedure. MASTER control –
OFF.
3-60. DELETED.
3-61. DELETED.
3-62. DELETED.
3-63. DELETED.
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