Propeller Owner’s Manual
136
INSPECTION AND CHECK
61-00-36
Page 5-10
Rev. 2 Feb/17
D. Overhaul Periods
In flight, the propeller is constantly subjected to vibration
from the engine and the airstream, as well as high centrifugal
forces. The propeller is also subject to corrosion, wear, and
general deterioration due to aging. Under these conditions,
metal fatigue or mechanical failures can occur. In order to
protect your safety, your investment, and to maximize the
safe operating lifetime of your propeller, it is essential that a
propeller be properly maintained and overhauled according
to the recommended service procedures.
CAUTION 1: OVERHAUL PERIODS LISTED BELOW,
ALTHOUGH CURRENT AT THE TIME OF
PUBLICATION, ARE FOR REFERENCE
PURPOSES ONLY. OVERHAUL PERIODS
MAY BE INCREASED OR DECREASED AS
A RESULT OF EVALUATION.
CAUTION 2: REFER TO THE LATEST REVISION OF
HARTZELL PROPELLER INC. SERVICE
LETTER HC-SL-61-61Y FOR THE MOST
CURRENT INFORMATION. THE SERVICE
LETTER IS AVAILABLE ON THE HARTZELL
PROPELLER INC. WEBSITE AT
WWW.HARTZELLPROP.COM.
(1) Reciprocating Engine Installations
(a) Three blade propellers manufactured
before
1983
are to be overhauled at 2000 hours. See paragraph
3.D.(1)(c) for calendar limits.
(b) Three blade propellers manufactured
after
1983
are to be overhauled at 2400 hours. See paragraph
3.D.(1)(c) for calendar limits.
(c) Propellers manufactured or overhauled since
October 1991 are required to have the internal hub
surface painted for additional corrosion protection.
Hubs with painted internal surface have a 72 month
overhaul calendar limit. Hubs which have not
had the internal surface painted have a 60 month
overhaul calendar limit until the hub internal surface
is painted for corrosion protection. After painting,
calendar limit increases to 72 months.
