ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Table 4-14. IMU Testing, Alignment, and Troubleshooting Continued
Malfunction
indication/corrective action
Test procedure
Normal indication
In approximately 45 minutes, TTY
2k. If the theodolite is to be used,
prints:
set it up to autoreflect on the
porro prism and measure the
THEODOLITE TEST
horizontal angle from the target
(TO ABORT AT ANY TIME TYPE:
to the porro prism as shown in
operation of theodolite. If the-
MOVE IMU TO 0 DEGREES
odolite is not used, go to step 2s
PITCH 0 DECREES ROLL
at completion of test (approxi-
WHEN DONE TYPE: RDY
mately 8 hours)
ALIGNMENT HALTED
2l. Move primary pallet to 0 de-
grees pitch and 0 degrees roll
Theodolite does not autoreflect: Ad-
Autoreflection achieved
2m. Remove porro prism cover and
just primary pallet orientation un-
level porro prism. Verify theod-
til autoreflection achieved
olite can autoreflect on porro
prism
TTY prints out:
TTY prints out:
2n. Type RDY
RDY
RDY
X.XX DEGREES PITCH
E N T E R THEODOLITE READ-
ING: (MILS) RDY
X.XX DEGREES ROLL
ALIGNMENT HALTED
ATTITUDE: NOT WITHIN 2 DE-
CREES OF REQUESTED
M O V E IMU TO X DEGREES
PITCH X DECREES ROLL
WHEN DONE TYPE: RDY
ALIGNMENT HALTED
Repeat steps 2l and 2m adjusting
pitch and roll as necessary
2o. Measure horizontal angle from
the target to the porro prism.
(Refer to chapter 5)
2p. Enter horizontal angle in format TTY prints:
XXXX.XX RDY
RDY
XXX.XXXX DECREES PITCH 10-
SEC AV
XXX.XXXX DECREES ROLL 10-
SEC AV
XXX.XXXX DECREES AZ 10-SEC
AV
M O V E IMU TO X DEGREES
PITCH X DECREES ROLL
WHEN DONE TYPE: RDY
4-88
Change 5
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