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| MIL-T-18232B(AS)
3.9.2
ENGINE MOUNTS
3.9.2.1
MOUNTS (RECIPROCATING ENGINES). -Engine mounts shall be
attached to the fuselage structure or nacelle structure so as
to be completely detachable and reinstallable without the use of jigs. Engine
mounts shall afford the maximum strength and accessibility consistent with the
general design of the target. Engine mounts shall be of simple construction and
shall offer the least interference to installation and removal of the power plant
as a unit and to removal and replacement of engine or accessories separately.
Forged engine mount rings maybe used subject to specific approval of NAVAIR.
3.9.2.2
MOUNTS (TURBO ENGINES). - Engine mounts for turbo engines
need not be detachable.
VIBRATION ISOLATORS. - Vibration isolators shall be provided
3.9.3
for engine mounts of all reciprocating engines and turbo-
propeller engines. Vibration isolators shall be provided for turbo-jet engines
when required by the detail specification.
COWLING AND COWL FLAPS. Cowling and cowl flaps includes
3.9.4
engine cowl, accessory compartment cowl, and cowl flaps.
3.9.4.1
COWLING DESIGN. - Cowling shall be readily removable in part
or entirely to permit access to the power plant. Removable
parts of the cowling shall be of size and shape convenient to handle. Reciprocat-
ing-engine cowling shall provide a tight seal with the baffles furnished with the
engine. The bottom of the cowling, shall be self-draining. All cowling shall be
ventilated to insure proper cooling of the engine and its vibration isolators,
and to prevent high temperatures in the engine compartment or accessory compart-
ment. Vents and joints in cowling shall be located out of the path of the exhaust
gases. Cowling shall permit the maximum engine deflections without overstressing
the cowling.
3.9.4.2
COWLING ATTACHMENT (RECIPROCATING ENGINES). - Cowling shall
be securely attached to the engine or to the target structure,
but not both at the same time if vibration isolators are employed. Cowling, fast-
enings, and supports shall provide minimum drag and maximum protection from the
weather for the engine. Where metal parts necessarily rub, easily replaceable
chafing strips of treated webbing, canvas, or other approved material shall be
provided to prevent chafing of the metal. Where practicable, the rubbing strips
shall be fastened to the fixed members rather than the removable members.
Particular attention shall be given to the prevention of rotary and fore-and-aft
movement of the cowling and to the prevention of failure due to expansion of the
engine.
3.9.4.3
COWL FLAPS (RECIPROCATING ENGINES). - cowl flaps shall have
minimum lost motion in operating the interconnecting parts,
considering wear and vibration incident to service. Cowl-flap hinges shall be
designed to localize wear in the hinge-pins or other parts easily replaceable.
3.10
PROPULSION
30
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