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higher torque until the bolt “breaks” free and starts to turn. This is not a good
indicator of actual bolt torque. As the bolt begins turn, read the torque indicated
on the dial. This is the actual torque. If required tighten the bolts to the specified
value of 225-250 inlbs.
CAUTION: If the actual torque is less than 150 inlbs the propeller must be removed for inspection if
there is bolt hole elongation the bolts must be replaced. Refer to the Hoffmann Manual
for inspection procedure.
If the actual torque on any of the bolts is above 250 inlbs, remove the torque by
loosening the bolt, then retorque to a maximum of 250 inlbs.
Propeller
DA20-C1 AMM
Page 204
09 Aug 2001 61-10-00 Doc # DA201-C1
Rev. 7
3. Remove/Install the Sensenich Propeller
A. Remove the Sensenich W69EK-63, W69EK7-63 or W69EK7-63G 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, front plate and backing plate with an index mark.
This will help you install these items in the correct position.
(4) Remove the spinner front dome:
− Mark the spinner and backing plate with
index marks to aid installation.
− Release the screws holding the front
dome spinner to the rear dome.
− Remove the front dome forwards.
Figure 2.
(5) Cut the lock wire on the attaching bolts.
Remove the cotter pins from the nuts
W69EK-63 propeller. Figure 2
W69EK7-63 or W69EK7-63G propeller
with castellated nuts. Figure 3.
(6) Remove the attaching bolts. Hold the propeller!
(7) Remove the pressure plate.
(8) Remove the spinner aft. dome
Remove the 10 screws which attach the
rear dome to the backing plate.
(9) Remove the propeller by pulling forward with
a slight rocking motion.
(10) Lift the propeller clear of the airplane.
(11) If necessary, remove the backing plate
Note: Following the propeller installation it is recommended that the assembly be
dynamically balanced. Use the balancing equipment manufacturers instructions
for this procedure.
DA20-C1 AMM
Propeller
Page 205
09 Aug 2001 61-10-00 Doc # DA201-C1
Rev. 7
B. Install the Sensenich W69EK-63, W69EK7-63 or W69EK7-63G 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 2
Figure 3
(3) Put the backing plate in position. 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.
Install a new propeller as shown in
Figure 2.
(5) Put the rear dome in position.
Install the 10 screws which attach the
rear dome to the backing plate
Make sure you align the index marks
(6) Attach the pressure plate to the propeller.
− Install the attaching bolts. Tighten the
bolts diagonally in pairs in small
increments.
W69EK-63 Propeller refer to the Sensenich
Manual W69EK-CF for torque values.
W69EK7-63 or W69EK7-63G Propeller
refer to the Sensenich Manual W69EK7-
CF for torque values.
Use new self-locking nuts.
(7) Do a tracking test. The tips must track within 3mm (1/8in) of
each other.
(8) Lockwire attachment bolts
Install cotter pins
Lock wire in pairs W69EK-63 propellers
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