Gentex HGU-56/P, Operation And Maintenance Instructions

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Table 3-3. Aviation Unit Maintenance Troubleshooting Procedures
(continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. UNABLE TO FASTEN OR ADJUST CHINSTRAP.
Inspect retention assembly for defective hardware or webbing.
Replace retention assembly in accordance with Paragraph
3-3.3 (Page 51).
4. UNABLE TO ADJUST NAPE STRAP.
Inspect retention assembly for defective hardware or webbing.
Replace retention assembly in accordance with Paragraph
3-3.3 (Page 51).
5. UNABLE TO KEEP MICROPHONE IN POSITION.
Inspect boom/swivel assembly for loose screw.
If unable to tighten screw, replace in accordance with
Paragraph 3-3.5, Page 55 (wire boom), or Paragraph 3-3.6, Page 56 (flex boom).
6. UNABLE TO ATTACH MFS.
Inspect MFS latches and strikers for faulty hardware.
As needed replace latch hardware as in paragraph 3-3.9 (Page 62)
or striker hardware as in Paragraph 3-3.10 (Page 63).
7. UNABLE TO COMMUNICATE.
Ensure that communications cord is plugged into communications unit
and that unit is working. Ensure helmet connector on left rear side of
helmet is secured. If still unable to hear, perform continuity check as
follows:
Step 1. Disconnect microphone cable from microphone.
Step 2. Remove receivers.
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