Scheduled Servicing; Airframe Lubrication; Application Of Grease; Application Of Oil - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Scheduled Servicing
1. Airframe Lubrication
Proper lubrication procedures are valuable for prolonging the service life of the airplane and as a
means of reducing the frequency of extensive and expensive repairs. The periodic application of
recommended lubricants to relevant bearing surfaces combined with cleanliness, as detailed in the
following paragraphs, ensures maximum efficiency and utmost service of all moving parts.
Lubrication instruction regarding locations, time intervals, and type of lubricants used are found in
proper lubrication charts. To ensure the best possible results from lubricant application, observe
the following precautions:
(a) Use only recommended lubricants. Where general purpose lubricating oil is specified, but
unavailable, clean reciprocating engine oil is a satisfactory substitute.
(b) Check components for evidence of excessive wear and replace as necessary.
(c) Removal all excess lubricants from components to prevent collecting dirt and sand in quantities
capable of causing excessive wear or damage to bearing surfaces.
2. Application of Grease
When lubricating bearings and bearing surfaces with a grease gun, ensure gun is filled with new,
clean grease specified for the particular application before applying lubricant to grease fittings.
(a) If a reservoir is not provided around a bearing, apply lubricant sparingly and wipe off excess.
(b) Remove wheel bearings from wheel hub and clean thoroughly with suitable solvent. When
repacking with grease, ensure lubricant enters space between rollers in retainer ring. Do not
pack grease into wheel hub.
(c) Use extra care when greasing Hartzell propeller hub to avoid blowing clamp gaskets. Remove
one grease fitting while applying grease to other fitting. Uneven greasing effects propeller
balance.
3. Application of Oil
If specific lubrication instructions for certain components are not available, observe the following
precautions:
CAUTION: AFTER THOROUGHLY WASHING AIRPLANE, ENSURE LANDING GEAR,
FLIGHT SURFACE WINGS, FLAP TRACKS, ELEVATOR TRIM SCREW, AND
ENGINE COMPARTMENT ARE STILL PROPERLY LUBRICATED.
(a) Apply oil sparingly. Never apply more than enough to coat bearing surfaces.
(b) Since control cables are sufficiently coated by manufacturer, additional protection for corrosion
prevention is unnecessary.
EFFECTIVITY:
040-999
12-20-00
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12-20-00
Jan
10/90