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Propeller
DA20-C1 AMM
Page 2
19 Dec 1997 61-00-00 Doc # DA201-C1
Rev. 0
Intentionally left blank
DA20-C1 AMM
Propeller
Doc # DA201-C1
Rev. 9 61-10-00 Page 1
29 Apr 2004
CHAPTER 61-10
PROPELLER ASSEMBLY
1. General
Two types of propeller can be installed on the DA20-C1. Some airplanes have a Hoffman fixed
pitch propeller. Other airplanes have a Sensenich fixed pitch propeller.
Refer to applicable propeller manufacturer manuals.
Hoffmann Propellers Manual Number E 0110.74.
Sensenich 7/16” bolt attachment propeller manual W69EK7-CF
Sensenich 3/8” bolt attachment propeller manual W69EK-CF
Also refer to applicable manufacturers Service Bulletins.
2. Description
A. Hoffmann HO-14HM-175-157 Propeller
Figure 1 shows the Hoffman propeller. It is a Hoffman HO-14HM-175-157 fixed pitch propeller with
two blades. The propeller blades are made of wood laminations. The blades have a composite skin
for protection.
An aft bulkhead (backing plate) attaches to the rear of the propeller. The aft bulkhead holds a
spinner with a one-piece dome. A front bulkhead attaches to the front of the blades. The front
bulkhead supports the spinner. Twelve screws attach the spinner to the aft bulkhead.
Six bolts attach the propeller assembly to the propeller extension. The bolts are wire locked in
pairs.
B. Sensenich W69EK7-63, W69EK7-63G and W69EK-63 Propeller
Figures 2 and 3 show the Sensenich propeller. It is a Sensenich fixed pitch propeller with two
blades. The propeller blades are made of wood laminations. The W69EK7-63G propeller has a
thin composite layer covering the wood laminations.
A backing plate attaches to the rear of the propeller. The backing plate holds a spinner with a 2-
piece dome. A pressure plate attaches to the front of the blades. The pressure plate holds the rear
part of the spinner dome against the propeller hub. Ten screws attach the rear dome to the backing
plate. Six screws attach the front dome to the rear dome.
Six bolts attach the propeller assembly to the propeller extension.
Propeller
DA20-C1 AMM
Page 2
24 Mar 1999 61-10-00 Doc # DA201-C1
Rev. 1
Figure 1: Hoffmann Propeller Assembly
DA20-C1 AMM
Propeller
Doc # DA201-C1
Rev. 5 61-10-00 Page 101
20 Mar 2001
TROUBLE-SHOOTING
1. General
Use the data below to trouble-shoot the main propeller. See also the propeller manufacturers
Owners Manual Hoffmann number E0110.74, Sensenich Propeller W69EK-CF or W69EK7-CF
manual.
Complaint Possible Cause Remedy
WARNING: FAILURE TO COMPLY WITH THE FOLLOWING MAY RESULT IN THE LOSS OF THE
PROPELLER! THE HUB OF A WOODEN PROPELLER WILL SHRINK OR EXPAND
TO MATCH THE AMBIENT CONDITIONS. EXCESSIVE HUB SHRINKAGE,
ESPECIALLY POSSIBLE DURING VERY COLD AND/OR DRY AMBIENT CONDITIONS
CAN RESULT IN LOSS OF PROPELLER BOLT TORQUE (PRE-LOAD). THIS CAN
ALLOW SLIGHT MOVEMENT RELATIVE TO THE DRIVE FLANGE, WHICH MAY
RESULT IN DAMAGE TO THE PROPELLER AND/OR THE PROPELLER BOLTS,
POSSIBLY EVEN LOSS OF THE PROPELLER! TO PREVENT THIS, PROPER
INSTALLATION AND PERIODIC RE-TORQUING IN ACCORDANCE WITH ALL
APPLICABLE MAINTENANCE INSTRUCTIONS IS NECESSARY.
UNDER ALL CIRCUMSTANCES THE INSPECTION INTERVAL MUST NEVER
EXCEED 50 HOURS. EXTREME CHANGES IN AMBIENT CONDITIONS
(TEMPERATURE/HUMIDITY) MAY REQUIRE SHORTER INSPECTION INTERVALS.
Engine vibration. Propeller out of balance.
The propeller mounting bolts
loose.
The spinner attaching screws
loose.
Blade tracking not correct.
Incorrect propeller alignment.
Examine the propeller. If you
find damage, refer to the
manufacturers Owners
Manual.
Torque tighten the propeller
mounting bolts in a crosswise
pattern.
Refer to the Installation
procedures, cautions and
warnings on the following
pages
Torque tighten the spinner
attaching screws to
2.25-2.8 Nm (20-25 in lbs).
Refer to the manufacturers
Owners Manual.
Remove the propeller. Install
the propeller in the correct
position. Refer to propeller
remove/install procedure in
the Maintenance Manual.
Propeller
DA20-C1 AMM
Page 102
20 Mar 2001 61-10-00 Doc # DA201-C1
Rev. 5
Figure 2: W69EK-63 Sensenich Propeller Assembly
Propeller Extension
Attaching Bolt
Pressure Plate
22-6101-00-01
Spinner Attaching
Screw
Spinner Attaching
Screw
Backing Plate
C-2397P
Spinner
Aft Dome
Spinner
Forward Dome
Fibre Washer
Fibre Washer
Recommended installation in line with
　
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