Rockwell Commander 112 - PROPELLER

SECTION IV
POWER PLANT
AND PROPELLER
MAINTENANCE MANUAL
ROCKWELL
COMMANDER
112/B/TC/TCA
PROPELLER
SPINNER
\
\
PROPELLER
AFT BULKHEAD
ASSEMBLY
X2411A7
Figure 4-13. Propeller
PROPELLER
The aircraft is equipped with Hartzell, all metal HC-
E2YR-1BF/F7666A, constant speed, two-blade pro-
peller for the Model 112 and a Hartzell, all metal HC-
E2YR-IBF/F8467-7R constant speed, two-blade pro-
peller for Models 112B/TC and TCA. The constant
speed propeller is a single-acting type in which oil
pressure from the engine, boosted and regulated by a
governor, is used to increase blade pitch. The natural
centrifugal twisting moment of the rotating blades and
the force of a spring are used to decrease blade pitch.
Any repairs of metal propellers involves evaluating
the damage and determining whether the repair will be
a major or minor one. Federal Aviation Regulations,
Part 43 (FAR 43) defines major and minor repairs
and alterations and who may accomplish them. Federal
A viation Regulations and the Hartzell manufacturer"s
instructions must be observed.
PROPELLER REMOVAL
a. Remove screws and washers attaching propeller
spinner to spinner wlkheads (see Figure 4-13).
b. Remove upper and lower engine cowling to gain
access to propeller attaching nuts.
c. Break safety wire and back off propeller attach-
ing nuts approximately 1/8 inch and pull prop forward
4-28
until stopped by nuts.
1101.
After the propeller is separated from
the engine, oil will drain from the pro-
peller and engine cavities.
d. Remove attaching nuts and pull propeller for-
\\lard to remove from engine.
PROPELLER HUB CLEANING
a. Remove forward spinner bulkhead.
b. Remove
cylinder retaining screws from pro-
peller hub and remove cylinder.
c. Use a solution of one part light engine oil and
two
parts solvent to clean exposed parts and cylinder
interior. Carefully dry with compressed air and lu-
bricate parts before reassembly.
d. Install new 0- rings and gaskets.
e. Reassemble cylinder to hub.
LUBRICATION. Various grease-type lubricants have
been tested by the propeller manufacturer and the
following
types are recommended in the order listed.
1. Hartzell DG Grease
(Low temperature synthetic)
2. Gulfex A-Gulf Oil Co.
3. Aero-General Purpose
Socony Mobil Co.
4. Mobil Aero La-Hi PD-535K
Copyright Commander Owners Group 2013 All Rights Reserved
**unofficial copy**