TM 55-1510-220-10
Table 3-5. Malfunction Codes (Sheet 2 of 2)
Malf
Modes of
Recommended
Code
Failed Test
Operation
Action Code
36
Accelerometer loop
ALIGN, NAV
01
37
Z platform overtemperature
NAV
01
38
XY platform overtemperature
NAV
01
40
Heading error
ALIGN
04
42
Drift angle >45°
NAV
02
44
Azimuth gyro drift rate
ALIGN
02
45
Gyro scale factor or loaded altitude
ALGIN
04
47
15-second loop
NAV
02
49
Fix measurement too large
NAV
02
51*
Excessive wind
ALIGN, NAV
05
54*
Incomplete conversion from UTM to L/L
STBY, ALIGN, NAV
05
57
XY platform rotation rate
ALIGN
02
59
600 millisecond loop
STBY, ALIGN, NAV
02
60
X or Y sample and hold change
ALIGN
04
62
XY platform rotation rate
NAV
02
63
CDU self-checks
STBY, ALIGN, NAV
02
* Failed test does not illuminate WARN light on DCU.
BT03618
j)
To obtain next higher memory
locations
Advance
waypoint
thumbwheel. (For example: If address
400 was entered with thumbwheel at
"0", address 402 will be available when
thumbwheel is set to "1", "404" when
thumbwheel is set to "2" etc.)
3-29A. GLOBAL POSITIONING SYSTEM (AN/ASN-
149(V)3).
a.
Description. Complete provisions are installed for a
global positioning system (GPS). The GPS is used
to provide updated position information to the inertial
navigation system. The GPS system consists of a
control/display unit; receiver; GPS key, load, and zeroize
panel; antenna electronics unit; and an antenna.
(1)
Control/display
unit
(CDU).
The
control/display unit (fig. 3-25A), located on the electronics
rack in the cabin, accomplishes all display and control
functions necessary for the operation of the GPS receiver.
(2)
GPS key, load, and zeroize panel. The GPS
key, load, and zeroize panel (fig. 3-25B), located on the
electronics rack in the cabin, contains GPS key, loading, and
zeroizing controls.
Change 5 3-76
