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|  TM 11-4920-296-14&P
INTRODUCTION
1-1
GENERAL.
to the aircraft transponder equipment. The
resulting reply pulses from the transponder
This manual contains intermediate
1-2.
are then received and analyzed by the AN/
level maitenance instructions with illus-
APM-378; if correct replies were generated,
trated parts breakdown for the Transponder
the test set gives a visual ACCEPT indica-
Set Test Set AN/APM-378 (also referred to
tion.
herein as test set). This equipment is man-
ufactured by The Bendix Corporation, Com-
1-9.
Interrogation modes which can be
mutications Division, Baltimore, Maryland
checked by the test set include modes 1, 2,
21204 under Contract N00019-73-C-0079.
3/A, C, test, and mode 4. In addition to
checking for correct reply pulse sets gen-
SCOPE AND ARRANGEMENT OF
erated by the aircraft transponder (with
1-3.
MANUAL.
proper spacings), the AN/APM-378 also
performs checks of the transponder trans-
Data within this manual is divided
1-4.
mitter frequency and power output, and
into six section. Section 1 contains gen-
emergency and I/P operability.
eral information; Section 2 gives equipment
1 - 1 0 . The AN/APM-378 test set is con-
description, theory and operating informa-
tained in a rugged combination case. Its cir-
tion. Section 3 gives the intermediate
cuits include self-check capability, to deter-
maintenance instructions for troubleshoot-
mine that the test set is fully operable, prior
i n g , disassembly, r e p a i r and reassembly,
to its flight-line use. The test set is designed
o f the test set. S e c t i o n 4 contains int-
to check AIMS transponders, including the
e r m e d i a t e test procedures.
following: RT-859/APX-72; RT-859A/
of the manual contains preservation, pack-
APX-72; RT-859B/APX-72 (Diversity);
aging, storage, and use information. Sec-
AN/APX-64; KY-532A; KY-533A; AN/APX-
tion 6 of the manual contains the illustrated
93; UPA-59; UPA-59A, UPA-60; RT-1156/
parts breakdown (IPB) for the equipment.
APX-100, RT-l157/APX-100, and RT-
1063/APX-101.
SERIALIZATION.
1-5.
1-11. For detailed listing of the charac-
1-6.
The information contained in this
teristics and capabilities of the test set,
manual is applicable to all Transponder Set
refer to Section 2.
Test Sets AN/APM-378 manufactured under
Contract N00019-73-C-0079.
1-12. RECORD OF APPLICABLE
1-7.
EQUIPMENT FUNCTION.
TECHNICAL DIRECTIVES,
1-8.
The AN/APM-378 test set is an
1-13. A record of applicable Technical
accept/reject type tester, used at the flight-
Directives is provided to identify the Tech-
line to provide rapid indication of the opera-
nical Directive number(s), date of issue,
tional status of AIMS Mark XII transponder
title and the publication date of the manual
equipments. The test set is capable of
change/revision/supplement which has in-
either direct- connected or radiated-path
corporated new operation/maintenance
testing of transponders. In operation, the
information for the equipment on which the
AN/APM-378 equipment generates interro-
work described in the technical directive
gation pulses, and feeds (or radiates) them
has been accomplished.
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