(2)
You can adjust the constant speed drive governor to change the output frequency of the generator. The permitted generator output frequency is 400 | 5 Hz (400 | 4 Hz during adjustment).
(3)
The constant speed drive is on the accessory gearbox at the 8 o'clock position.
B.
References
(1)
AMM 12-13-21/301, Constant Speed Drive - Oil Servicing
(2)
AMM 24-11-11/401, Constant Speed Drive
(3)
AMM 24-22-00/201, Manual Control
(4)
AMM 71-00-00/201, Power Plant
(5)
AMM 71-11-02/201, Fan Cowls
C.
Access
(1)
Location Zones
506 Engine 1 - Accessory Gearbox, 8 o'clock
606 Engine 2 - Accessory Gearbox, 8 o'clock
101 Left Control Cabin - P5 overhead panel
(2)
Access Panels
5746 Left Fan Cowl - Engine 1
5846 Left Fan Cowl - Engine 2
D.
Make Sure that the Constant Speed Drive Operates Correctly (Fig. 501).
(1)
Make sure that the frequency meter on the P5-13 panel is accurate.
S 865-003-001
(2)
Supply engine generator power (AMM 24-22-00/201).
S 755-002-001
(a) Permit the CSD to operate for three minutes to become warm.
S 865-004-001
(3)
Turn the AC meters switch on the P5-13 panel to the applicable GEN 1 or GEN 2 position.
S 865-005-001
(4)
Put electrical loads on the AC buses. Use lights, air conditioning, fuel boost pumps, and hydraulic pumps.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. CONSTANT SPEED DRIVES ú
24-11-11
ú CONFIG ú 01 Page 501 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500
MAINTENANCE MANUAL
GOVERNOR
ADJUSTMENT
SCREW
SEE A
ADJUSTMENT
CAP
CAP SCREW
O-RING
WASHER DISCONNECT RESET T-HANDLE
GOVERNOR
ADJUSTMENT
SCREW
ADJUSTMENT
SCREW
O-RING
ADJUSTMENT CAP
NORMAL CONDITION ENGAGED CONDITION GOVERNOR ADJUSTMENT SCREW
A
Generator Drive Governor Adjustment
Figure 501
A60388
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. CONSTANT SPEED DRIVES ú
24-11-11
ú CONFIG ú 01 Page 502 ú Jul 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
S 215-006-001
(5) Make sure that the frequency meter on the P5-13 panel shows
400 | 5 Hz.
(a) If the frequency is not in the limits, adjustment is necessary. 1) Write down the frequency value.
S 865-007-001
(6)
Remove the electrical loads that you applied before (lights, air conditioning, fuel boost pumps, and hydraulic pumps).
S 215-008-001
(7)
Make sure that the frequency meter on the P5-13 panel shows
400 | 5 Hz.
(a) Replace the CSD if the conditions that follow occur: (AMM 24-11-11/401) 1) The frequency is not stable. 2) The frequency goes out of the limits and stays out when you
apply or remove the loads.
S 865-009-001
(8)
Remove the engine generator power (AMM 24-22-00/201).
E.
Adjust the CSD Output Speed.
S 215-039-001
WARNING:_______MAKE SURE THE ENGINES ARE STOPPED WHEN YOU ADJUST THE CSD. THE CSD ADJUSTMENT PUTS MAINTENANCE PERSONS IN THE DANGEROUS ZONE THAT IS AROUND THE ENGINE INLET. ENGINE SUCTION CAN CAUSE INJURY TO PERSONS.
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