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DA20-C1 AMM
Propeller
Doc # DA201-C1
Rev. 5 61-10-00 Page 103
20 Mar 2001
Intentionally left blank
Propeller
DA20-C1 AMM
Page 104
29 Apr 2004 61-10-00 Doc # DA201-C1
Rev. 9
Figure 3: Sensenich W69EK7-63 and W69EK7-63G Propeller
Installation
DA20-C1 AMM
Propeller
Doc # DA201-C1
Rev. 1 61-10-00 Page 201
24 Mar 1999
MAINTENANCE PRACTICES
1. General
These maintenance practices tell you how to remove and install the propeller. Refer to the
manufacturers Owners Manual for further data.
2. Remove/Install the Hoffmann HO-14HM-175-157 Propeller
A. Remove the Hoffmann HO-14HM-175-157 Propeller.
WARNING: MAKE SURE THAT THE MAGNETOS ARE SAFE BEFORE YOU DO
ANY WORK ON THE PROPELLER. IF THE ENGINE IS TURNED, THE
PROPELLER CAN CAUSE INJURY OR DEATH.
Detail Steps/Work Items Key Items
(1) Make the engine safe. Make sure that the ignition switch is set to
OFF.
(2) Remove the engine cowlings. Refer to Chapter 71-10.
(3) Release the ignition leads from the spark
plugs.
Note: Mark the propeller, spinner, forward bulkhead and aft bulkhead with an index
mark. This will help you install these items in the correct position.
(4) Remove the spinner:
− Mark the spinner and aft bulkhead with
index marks to aid installation.
− Release the screws holding the spinner
to the aft bulkhead.
− Pull the spinner forward from the aft
bulkhead and forward bulkhead.
Figure 1.
(5) Cut the lock wire on the attaching bolts.
(6) Remove the attaching bolts. Hold the propeller!
(7) Pull the propeller forward from the propeller
extension.
Hold the aft bulkhead!
Propeller
DA20-C1 AMM
Page 202
09 Aug 2001 61-10-00 Doc # DA201-C1
Rev. 7
B. Install the Hoffmann HO-14HM-175-157 Propeller
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.
Detail Steps/Work Items Key Items
(1) Make the engine safe. Make sure that the ignition switch is set to
OFF. Make sure that the ignition leads are
disconnected from the spark plugs.
(2) Make sure that the mating faces of the
propeller and extension are clean and dry.
Figure 1.
(3) Place aft bulkhead onto propeller flange. Make sure you align the index marks.
(4) Push the propeller into position on the
propeller extension flange.
Make sure you align the index marks.
(5) Attach the forward bulkhead to the propeller.
− Install the attaching bolts.
− With a calibrated torque wrench, torque
bolts in a crosswise pattern.
Make sure the o-ring is in place.
Make sure each bolt has a washer.
Refer to the Hoffmann Owners Manual for
torque values.
(6) Do a tracking test. Refer to Hoffmann Owners Manual.
(7) Lock wire the bolts Lock wire in pairs
(8) Install the spinner:
− Push the spinner onto the forward and
aft bulkheads.
− Install the screws holding the spinner to
the aft bulkhead.
− Tighten the spinner screws.
Make sure you align the index marks.
Make sure that the O-ring seal is in
position on the front plate.
Make sure each screw has a washer.
Torque to 2.2-2.8 Nm (20-25 in lbs).
(9) Connect the ignition leads to the spark plugs. Torque to 12.4-13.5 Nm (110-120 in lbs).
(10) Install the engine cowlings. Refer to Chapter 71-10.
DA20-C1 AMM
Propeller
Doc # DA201-C1
Rev. 9 61-10-00 Page 203
29 Apr 2004
(11) Do an engine ground run-up. Look specially
for vibration.
Refer to the DA20-C1 Flight Manual for
engine start/stop procedures.
Following the installation of the propeller:
Check bolt torque after the FIRST FLIGHT, after the first 25 hours and after that
as necessary, but at least EACH 50 HOURS. Do NOT loosen the bolts. Using a
Dial type torque wrench apply torque in the tightening direction. You may notice a
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