(2)
For T2, remove APU lower shroud.
(a)
Open APU compartment access door latches and open access door. Install door support rods.
(b)
Support shroud, open shroud latches, and remove shroud.
CAUTION: EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
(3)
For T4 or T5, loosen two screws on inboard edge of panel P6-11 (for T4) or P6-12 (for T5) and swing panel forward.
(4)
For T7, T8, or T9, enter electronic compartment above the nose wheel well through the electronic compartment access door.
C. Remove electrical connector from current transformer.
D. Tag and remove each lead running through current transformer. Identify lead by:
(1)
Name and equipment number of device from which lead was removed.
(2)
Terminal on device from which lead was removed.
(3)
Hole on current transformer where lead runs through (left, right, or center).
E. Remove mounting fasteners from current transformer and remove current transformer.
501
Oct 20/88 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 24-21-71 Page 401
Current Transformer Component Location 501
24-21-71 Figure 401 (Sheet 1) Jun 20/84
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EFFECTIVITY
AIRPLANES PRIOR
TO INCORPORATION
OF SB 24-1076
503 Current Transformer Component Location
Feb 20/90 Figure 401 (Sheet 2) 24-21-71
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Current Transformer Component Location 503
24-21-71 Figure 401 (Sheet 3) Feb 20/90
Page 404
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
503 Current Transformer Component Location
Feb 20/90 Figure 401 (Sheet 4) 24-21-71
Page 405
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
3. Install Current Transformer (Fig. 401)
A. Install current transformer with fasteners.
B. Install leads through holes in current transformer to applicable terminal.
CAUTION: CHECK THAT LEADS PASS THROUGH PROPER HOLES IN CURRENT TRANSFORMER. INCORRECT INSTALLATION WILL RESULT IN CIRCUIT MALFUNCTION.
C. Install electrical connector on current transformer.
D. Close access panel or shroud as applicable.
(1)
Close right cowl panel (Ref 71-11-11).
(2)
Install APU lower shroud.
(a) Position lower shroud against upper shroud and close shroud latches.
CAUTION: MAINTAIN A MINIMUM CLEARANCE OF 0.18 INCH BETWEEN ENGINE PLUMBING, FIRE DETECTOR, CLAMPS, AND INSIDE SURFACE OF LOWER SHROUD.
EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
(b) Disengage APU compartment access door support rods and stow rods. Close and latch access door.
(3)
Close P6-11 or P6-12 panel and tighten screws.
(4)
Close electronic compartment access door.
E. Test current transformer by testing ac generation system (Ref 24-21-0).
503
24-21-71 Page 406 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/90
GENERATOR CONTROL UNIT - REMOVAL/INSTALLATION
1. Remove GCU (Generator Control Unit)
A. Remove all electrical power from airplane (Ref 24-22-0 MP).
CAUTION: ALL ELECTRICAL POWER MUST BE REMOVED FROM THE AIRCRAFT DURING REMOVAL/INSTALLATION OF GCU TO PREVENT POSSIBLE DAMAGE TO CURRENT TRANSFORMERS OR GCU.
B. Remove GCU (Ref 20-10-111).
2. Install GCU
CAUTION: ALL ELECTRICAL POWER MUST BE REMOVED FROM THE AIRCRAFT DURING REMOVAL/INSTALLATION OF GCU TO PREVENT POSSIBLE DAMAGE TO CURRENT TRANSFORMERS OR GCU.
A. Install GCU (Ref 20-10-111).
3. Test Generator Control Unit
A. Test Engine Generator and Control
(1)
On the P5-4 panel, make sure the following switches are OFF:
(a)
BUS TRANS
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