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adjuster link bracket.
Discard the lock washer.
(5) Cut and discard the lockwire on the bottom
mounting-bracket bolt at the generator pivot
point. Remove the bolt and the lock washer
from the generator and the bottom mounting
bracket.
Hold the generator so that it does not fall
when the bolt is removed.
Discard the lock washer.
(6) Remove the generator from the aircraft.
B. Install the Generator/Alternator
Refer to Figure 4 – Sheets 1 and 2.
Detail Steps/Work Items Key Items
(1) Make sure that the mounting bracket is held
in place and is correctly installed on the
engine.
(2) Put the generator in its correct position to
align with the bottom of the mounting
bracket, aft of the stabilizer bracket.
The generator is installed between the
bottom of the mounting bracket and the
stabilizer bracket.
(3) At the generator pivot point on the stabilizer
bracket, install the attaching bolt and lock
washer. Do not torque the bolt.
Make sure that the head is marked ’10.9’.
Apply Loctite 222 to the shank and threads
of the bolt. Use a new lock washer.
Use a new lock washer.
(4) At the adjuster link for the generator, install
the adjusting bolt, the plain washer and lock
washer. Do not torque the bolt.
Apply Loctite 222 to the shank and threads
of the bolt.
Use a new lock washer.
Electrical Power
DA20-C1 AMM
Page 210
30 Oct 2008 24-30-00 Doc # DA201-C1
Rev. 14
Detail Steps/Work Items Key Items
CAUTION: DO NOT MAKE THE BELT TOO TIGHT. TOO MUCH TENSION CAN
CAUSE GENERATOR BEARING FAILUREDO NOT ADJUST THE
GENERATOR BELT TO MAKE IT TOO TIGHT. IF IT IS ADJUSTED
TOO TIGHTLY THE TENSION CAN CAUSE DAMAGE TO THE
GENERATOR BEARINGS.
(5) Adjust the flexible belt tension.
− Then tighten the adjusting bolt and the
top adjusting bolt and the top mounting
bolt at the adjuster link.
Belt movement = 5mm (0.2 in) With 3 kg
(6.5 lbs) load applied.
Torque the two bolts to 22 Nm (195 in lbs).
(6) At the generator pivot point on the stabilizer
bracket, tighten the bolt. Lock the bolt head
with wire to the bracing strut.
Torque the bolt to 35 Nm (26 ft lbs).
(7) With all of the attaching hardware correctly in
place, measure the alignment between the
generator pulley and the prop extension
pulley.
The misalignment between the generator
pulley and the prop extension pulley is not
to exceed ± 0.8 mm (0.031 in).
(8) If necessary, adjust the generator/alternator
mounting bracket to align the generator
pulley with the prop extension pulley.
Refer to Chapter 24-30. Install the
Generator/Alternator Mounting Bracket.
Note: To align the generator pulley with the prop extension pulley it may be necessary
to loosen attaching hardware and adjust the mounting bracket forward or aft.
If the mounting bracket must be adjusted, do as follows:
- Make sure to torque again and witness mark the components in item
5. B. (10) when completed
- Make sure to adjust the flexible belt tension again as necessary
- Make sure to torque again the components in Item 6. B. (5) and (6) when
completed.
(9) Lock wire the bottom mounting-bracket bolt
at the generator pivot point to the stabilizing
bracket.
Use .032" Lockwire.
Apply LPS3 to the hole in the bolt head
after installing the lockwire.
(10) Put witness marks on the hardware that
follows:
− The adjusting bolt at the adjuster link
− The top mounting bolt at the adjuster
link
The bottom mounting-bracket bolt at the
generator pivot point.
(11) Connect the electrical connections to the
generator at the generator.
DA20-C1 AMM
Electrical Power
Doc # DA201-C1
Rev. 14 24-30-00 Page 211
30 Oct 2008
Detail Steps/Work Items Key Items
(12) Connect the battery. Make sure that you
connect the positive lead first.
Refer to Chapter 24-31.
(13) Do a functional test of the generator. Refer to Chapter 24-30 – Adjust/Test the
Generator/Alternator.
Electrical Power
DA20-C1 AMM
Page 212
30 Oct 2008 24-30-00 Doc # DA201-C1
Rev. 14
7. Adjust/Test the Generator/Alternator
A. Equipment
Items Quantity Part Number
DC voltmeter 1 Commercial
B. Test the Generator/Alternator
Note: Only persons who are authorized and trained can do an engine ground run-up.
Detail Steps/Work Items Key Items
CAUTION: FOLLOW THE USUAL SAFETY PRECAUTIONS FOR WORKING ON
LIVE ELECTRICAL SYSTEMS.
(1) Connect the DC voltmeter to the measure
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