MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
M-7-235C
Rev. D
30/37
An extremely close visual inspection of the engine mount should be made to periodically
check for cracks, dents, weld failures, etc., of the mount tubular members as well as the gen-
eral condition of the mount. At regular intervals, the attaching bolts at the engine should be
checked for tightness (required torque value of 37.5-41.5 ft. lb.) The rubber engine mounts
should be carefully inspected and replaced if necessary at each 100-hour inspection. Exces-
sive engine vibration at various RPM ranges should also prompt their inspection. Care should
be exercised to prevent the rubber mount’s contact with oil as this may result in their premature
deterioration. When torquing any engine or mount bolts, precaution should be taken against
any over-tightening, as this also may cause early failure.
COWLING AND BAFFLING:
The cowling consists of an upper and lower section. Removal is accomplished by unlock-
ing the dzus fasteners and removing the AN526 screws.
A periodic inspection of the cowling should be made checking for cracks, chafing, security
of attachment, etc.
Baffling should be checked for security and the rubber sealing extensions should be
checked for wear and security. When the cowl is installed, these sealing extensions should lay
up, forward or inboard, and provide a good seal against the cowl.
BRACKETT AIR FILTER: (See below for other air filter)
Service by: 1. Replacement of element when:
a) Every 12 months regardless of hours used,
b) or, every 100 hours use,
c)
or, when operating in extremely dusty conditions, change frequently; use
your good judgment.
Special instructions for new element: Squeeze out all excess wettant in element prior to
installation. And DO NOT WASH OUT wettant as this will destroy some of the filter’s effi-
ciency. Be sure safety pin is in place after installing.
AIR FILTER: (other than Brackett)
Visually inspect at each periodic maintenance. Follow cleaning instructions as printed on
air filter. Clean periodically as determined by environmental conditions encountered. Replace
when cleaning no longer services unit.
EXHAUST SYSTEM:
Remove Heater Shells, check mufflers and tailpipes for cracks. Check attachments for
security. Note that the tailpipe clamps and the muffler-to header attachments should not be
tightened to the point of rigidity, but should be loose enough to be moved easily by hand.
Check the heater shell retaining screws for security and ensure that hot air hoses are
clamped tightly and are not worn or chafed.
