MOONEY SECTION
Vlll
MODEL M20J HANDLING, SERVICE
&
MAINTENANCE
MAINTENANCE
PROPELLER CARE
The high stresses to which propeller blades are subjected makes their careful
inspection and maintenance vitally important. Check the blades for nicks,
cracks, or indications of other damage before each flight. Nicks tend to
cause high- stress concentrations in the blades which,
if
ignored, may result
in cracks. It is very important that all nicks and scratches be polished out
prior to next flight. It is not unusual for the propeller blades to have some
end play or fore and aft movement as a result of manufacturing tolerances in
the parts. This has no adverse effect on propeller performance or operation
and is no cause for concern if the total movement at the blade tip does not
exceed
.12
inches. With the first turn, centrifugal force firmly seats the
blades, rigidly and positively against the retention bearing in the propeller hub.
Preflight inspection of the propeller blades should include, in addition to the
foregoing, an occasional wiping with an oily cloth to clean off grass and bug
stains. NEVER USE AN ALKALINE CLEANER ON THE BLADES; remove
grease and dirt with tetrachloride or Stoddard solvent.
McCauley recom-
mends the propeller be removed and overhauled every
1500
HOURS of
operation.
Hartzell recommends the optional propeller be removed and over-
hauled every
1500
HOURS of operation.
Your
Mooney Service Center will answer any questions you may have con-
cerning blade repair and inspection.
EXTERIOR CARE
As with any paint applied to a metal surface, an initial curing period is neces-
sary for developing the desired qualities of durability and appearance. There-
fore, DO NOT APPLY WAX
TO THE NEW AIRCRAFT EXTERIOR UNTIL TWO
OR THREE MONTHS AFTER DELIVERY. Wax substances will seal paint from
the air and prevent curing. Wash the exterior to prevent dirt from working
into the curing paint. Hold buffing to a minimum until curing is complete and
there is no danger of disturbing the undercoat.
"
CAUTION
"
NNNNNNNN
Before washing the exterior, be certain the brake discs
are covered, a
pitot cover is in place, and all static-air
buttons are masked off.
Remove grease or oil from the exterior by wiping with a cotton cloth
saturated in kerosene. Flush away loose dirt and mud deposits before wash-
ing the exterior with an aircraft-type washing compound mixed in warm
water. Use
soft
cleaning cloths or a chamois, and USE ONLY MILD LIQUID
TYPE DETERGENTS, avoid harsh or abrasive detergents that might scratch
or corrode the surface. It is essential that ALL CLEANING COMPOUNDS
REV.B
6-1
2-87
ISSUED
6-2-86
8-9
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