TM 9-4120-402-14
Table 4-3. UNIT TROUBLESHOOTING - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9. EXCESSIVELY NOISY OPERATION. - continued
Step 2. Check fans for looseness or damage, and for rotational clearance.
Tighten loose fans, adjust for rotational clearance, or replace fans. (See paragraph 4-46 and 4-47.)
Step 3. Check all internal components for looseness, vibration, and security.
Tighten, adjust, and secure as necessary.
Section VI UNIT MAINTENANCE PROCEDURES
4-9. GENERAL.
The procedures in this section have been arranged in the order in which the items appear in the unit (O) maintenance
level column on the Maintenance Allocation Chart (MAC) which is provided in Appendix B. Step-bystep procedures have
been provided for all action authorized to be performed by unit maintenance in the order in which they appear on the
MAC.
WARNING
Do not operate this unit with the panels, covers, screens, grilles, and guards removed or open
unless the instructions tell you to. When this is necessary, do so with care to prevent personal
injury.
4-51