TB 43-0123
AN/ASN43
JTO
1. Brief Description: The AN/ASN-43( ) Gyromagnetic
NOTE
Compass Set provides accurate heading information,
referenced to a free directional gyro heading when
The AN/ASN-43( ) is used with a variety
operated in the DG mode (free gyro) or slaved to the
of other components such as amplifiers,
earth's magnetic field when operated in the MAG mode
controls, indicators, etc., to operate as
(magnetically slaved). It is usable in both fixed and rotary
complete system. Refer to applicable
wing aircraft up to altitudes of 50,000 feet. The CN-998B/
aircraft configuration sheets for details.
ASN-43 Directional Gyro, part of the AN/ASN-43A system,
The C-8021( )/ASN-75 is used with the
is an improved version which incorporates a drift bias
AN/ASN43 Gyro Compass system in the
function and circuit packaging modifications to provide
UH-60 and CH47D aircraft.
improved reliability under environmental exposures. The
C-8021/ASN-75 is used with the AN/ASN-43 Gyro
2. Applicable Tools and Test Equipment:
Compass System in the UH-60 and CH47D Aircraft.
See appendix B for nomenclature, NSN, etc.
Major components of both configurations of the AN/ASN-
43( ) are:
Type No.
AVUM
AVIM
AN/ASM-339(V)1
X
AN/ASN-43 consists of:
AN/URM-105C
X
CN-405/ASN ............................. Compensator
AN/USM-223
X
CN-998/ASN43 ......................... Directional Gyro
AN/USM-281A
X
T-611/ASN ................................ Compass Transmitter
ME-30( )/U
X
ME-223/U
X
AN/ASN-43A consists of:
ME-227/U
X
CN-405/ASN ............................. Compensator
MK-1040A/ASN
X
CN-998B/ASN-43 ..................... Directional Gyro
MK-4042A
X
T-611/ASN ................................ Compass Transmitter
TK-100/G
X
C-6347/ASN ............................. Control Compass
TK-101/G
X
TK-105/G
X
ll-B-20
