TM 5-4520-256-14
4-4. CABINET ASSEMBLY MAINTENANCE - Continued.
a. Cleaning.
WARNING
Cleaning solvent, Federal specification P-D-680, is toxic and flammable. Use only in a well-
ventilated area. Avoid prolonged breathing of fumes. Keep solvent away from flames. Do not
use in excessive amounts. Avoid skin contact.
(1) Clean the exterior of the heater unit with cleaning solvent (item 11, Appendix E). Pay particular attention to any
grease, oil, or other stains.
(2) Allow to dry.
b. Inspection.
(1) Inspect access door as follows:
(a) Inspect door for dents, holes, cracks, and corrosion.
(b) Inspect door for damaged or missing quarter-turn fasteners.
(c) Inspect door for damaged, deteriorated, or missing gaskets.
(2) Inspect fresh air damper as follows:
(a) Inspect damper for broken or missing chain and chain for corrosion or burrs.
(b) Inspect hinges for loose or missing rivets, damage, dents, and corrosion.
(c) Inspect damper for loose, damaged, or missing hardware.
(d) Inspect damper for dents, burrs, cracks, or corrosion.
(3) Inspect access door as follows:
(a) Inspect door for dents, holes, cracks, and corrosion.
(b) Inspect door for loose, missing, or damaged hardware.
(4) Inspect duct cover as follows:
(a) Inspect cable for secure mounting, burrs, breaks, and corrosion.
(b) Inspect cover for cracks, holes, and deterioration.
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