TM 9-2320-209-10-1
Using the Quilted Engine Compartment Cover.
c.
FRAME 1
CAUTION
Open aperture flap (1) when engine temperature goes
above 180 F. If engine temperature keeps going up, take
off quilted engine compartment cover (2) completely, so
that engine does not overheat. Failure to remove quilted
engine compartment cover may cause damage to the engine.