ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
Table 3-1. Operator Troubleshooting - Continued
Test or Inspection
EXCESSIVELY NOISY OPERATION
Isolate source of noise as near as possible, both by ear and touch.
Contact Unit Maintenance
Check all external panels and filters for looseness, vibration and security.
Contact Unit Maintenance.