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5-30.
TM5-4120-377-14
Preliminary procedures:
1. Remove conditioned air filter. (See para 4-33.)
2. Remove fresh air filter. (See para 4-34.)
Figure 5-29. Fresh Air Damper
a. Inspection
(1) Check that chain and pendant are in place and not broken.
(2) Check that spring loaded hinges are secure and that they cause door to close when chain is released.
(3) Check that gasket is not loose, split, or missing.
(4) Check that pulley and retaining bracket are in place and that chain works properly around pulley.
(5) Repair or replace parts as indicated.
b. Hinge and door replacement
(1) Use a drill bit slightly smaller than the rivet body to drill old rivets out.
(2) Rivet replacement hinges and door in place.
(3) Check that door springs closed when chain is released.
c. Gasket replacement
(1) Remove as much old gasket material as possible by pulling or scraping it away from the metal surface.
Acetone and methyl-ethyl ketone (MEK) are flammable, and their vapors can be explosive.
Repeated or prolonged skin contact or inhalation of vapors can be toxic. Use a well-
ventilated area, wear gloves, and keep away from sparks or flame.
5-58
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