Propeller Owner’s Manual
147
MAINTENANCE PRACTICES
61-00-47
Page 6-7
Rev. 16 May/20
2. Lubrication
(Rev. 3)
CAUTION:
INSTRUCTIONS AND PROCEDURES IN
THIS SECTION MAY INVOLVE PROPELLER
CRITICAL PARTS. REFER TO THE
INTRODUCTION CHAPTER OF THIS
MANUAL FOR INFORMATION ABOUT
PROPELLER CRITICAL PARTS. REFER TO
THE ILLUSTRATED PARTS LIST CHAPTER
OF THE APPLICABLE OVERHAUL MANUAL(S)
FOR THE IDENTIFICATION OF SPECIFIC
PROPELLER CRITICAL PARTS.
A. Lubrication Intervals
(1) The propeller must be lubricated at intervals not to
exceed 400 hours or 12 calendar months, whichever
occurs first, except as listed.
(a) If the aircraft is operated or stored under adverse
atmospheric conditions, e.g., high humidity, salt air,
calendar lubrication intervals should be reduced to
six months.
(b) If the propeller is leaking grease, the lubrication
interval should be reduced to 100 hours until the
grease leak issue is resolved.
(c) For the HC-E5A-2( ) propeller installed on Pilatus
PC-21 aircraft only: Lubricate the propeller at
450 hour intervals or at twelve (12) calendar months,
whichever occurs first.
(d) If more frequent propeller lubrication is desired, it is
highly recommended that compliance with Hartzell
Propeller Inc. Service Letter HC-SL-61-241 be in
place to prevent over-servicing.
(2) Owners of high use aircraft may wish to extend their
lubrication intervals. The lubrication interval may be
gradually extended after evaluating bearing wear and
internal corrosion when the propeller is overhauled.
