Page 5-8
Dec/05
Propeller Owner’s Manual
175
INSPECTION AND CHECK
61-00-75
B. Grease or Oil Leakage
NOTE:
A new or newly overhauled propeller may leak
slightly during the first several hours of operation.
This leakage may be caused by the seating of
seals and O-rings, and the slinging of lubricants
used during assembly. Such leakage should cease
within the first ten hours of operation.
Leakage that persists beyond the first ten hours of operation
on a new or newly overhauled propeller, or occurs on a
propeller that has been in service for some time will require
repair. A determination should be made as to the source
of the leak. The only leakage that is field repairable is the
removal and replacement of the O-ring seal between the
engine and propeller flange. All other leakage repairs should
be referred to an appropriately licensed propeller repair
facility. An instance of abnormal grease leakage should be
inspected using the following procedure:
(1) Remove the spinner dome.
CAUTION:
PERFORM A VISUAL INSPECTION
WITHOUT CLEANING THE PARTS. A
TIGHT CRACK IS OFTEN EVIDENT DUE
TO TRACES OF GREASE EMANATING
FROM THE CRACK. CLEANING CAN
REMOVE SUCH EVIDENCE AND MAKE A
CRACK VIRTUALLY IMPOSSIBLE TO SEE.
(2) Perform a visual inspection of the hub, blade clamps and
blades to locate the origin of leakage. If the origin of the
grease leakage is determined to be a noncritical part,
such as an O-ring, gasket or sealant, repairs can be
accomplished during scheduled maintenance as long as
flight safety is not compromised.
(3) If cracks are suspected, perform additional inspections
before further flight (by qualified personnel at an
appropriately licensed propeller repair facility) to
verify the condition. Such inspections typically include
disassembly of the propeller followed by inspection of
parts, using nondestructive methods in accordance with
published procedures.
OBSOLETE PROPELLER MODELS. SEE COVER PAGE
WARNINGS AND SERVICE BULLETIN HC-SB-61-331
