3-1 Identifying Faulty Components of Lightweight Doppler Navigation Set
AN/ASN-128.
a. This exercise is a combination of all the material that has been
covered by this subcourse on the AN/ASN-128.
b. The equipment you will use in this exercise is a complete AN/ASN-128
installed in the aircraft or a setup on the workbench, a TK-101/G, and spare
parts, if available.
c. You will troubleshoot the AN/ASN-128 using the built-in test
equipment (BITE) to identify faulty components of the doppler navigation
set.
d. Read para 5-8, page 102 and the organizational troubleshooting,
Table 5-2 in TM 11-5841-281-12.
e. Take time now to review the various exercises in this subcourse.
After you have reviewed, then perform a complete operational check from A to
Z. Using the operation check and the troubleshooting chart will help you to
identify the faulty component.
Refer to prior instructions for operating
procedures.
NOTE:
1.
If the MAL lamp lights during any mode of operation except
lamp test, the computer-display unit MODE switch should
first be set to "OFF" position and then to TEST to verify
the failure. If the MAL lamp remains lighted after turning
to the TEST position, go to the following bad component
identification procedures in Table 5-2, TM 11-5841-281-12,
page 104 through 108.
2.
After changing the component and the fault is still
uncorrected, this could be caused by faulty wiring and will
be covered by the task on faulty wiring identification.
f. At this time you should have read the material requested in this
lesson and reviewed the previous lesson in this subcourse. Get with your
training supervisor and talk over anything you are in doubt about.
If,
after your talk with the training supervisor and you feel you have the
confidence, then go to the practice steps.
Training Supervisor Eval
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