(2)
An installation of the APU current transformer.
B.
The two APU current transformers are installed behind the bulk cargo compartment and attached to the two brackets on the airplane floor beam. You can get access to the two APU current transformers through the bulk cargo compartment door and access station 2160 bulkhead door.
TASK 49-61-11-004-020
2. APU Current Transformer Removal (Fig. 401)_______________________________
A. Access
(1)
Location Zones 151 Area Aft of Bulk Cargo Compartment - Left 152 Area Aft of Bulk Cargo Compartment - Right 221 Control Cabin - Left 222 Control Cabin - Right
(2)
Access Panels
146AZ Access Station 2160 Bulkhead Door
823R Bulk Cargo Compartment Door
B.
Prepare for the Removal
S 864-001
(1)
Make sure the APU control switch on the P5 overhead panel is OFF and attach a DO-NOT-OPERATE tag.
S 864-022
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6-2 Main Power Distribution Panel
1) 6K18, APU ALTN CONT
(b)
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIME CONT
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49-61-11
ALL ú ú 01 Page 401 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 014-036
(3)
Open the bulk cargo compartment door, 823R.
S 014-003
(4)
Open the access station 2160 bulkhead door, 146AZ.
C.
APU Current Transformer Removal
S 024-037
(1)
Do these steps to remove the APU current transformer (2):
(a)
Disconnect the electrical connector (1) from the APU current transformer (2).
(b)
Remove the two screws (4) and two washers (5) that attach the lanyard and cover (3) to the APU current transformer (2).
(c)
Remove the cover (3).
(d)
Remove the two nuts (9), two washers (7) and two screws (6) that attach the two clamps (8) and generator cable to the airframe.
(e)
Remove the two clamps (8).
(f)
Remove the three nuts (11) and three screws (10) that attach the APU current transformer (2) to the bracket.
(g)
Remove the APU current transformer (2).
(h)
Make sure you install all necessary protection covers.
TASK 49-61-11-404-021
3. APU Current Transformer Installation (Fig. 401)____________________________________
A. References
(1) AMM 20-22-01/601, Electrical Bonding
B. Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 2 | APU Current Transformer | 49-61-11 | 01 | 15 or | | | | | | | 115 | 2.......….......…...................................…...........…......….......1
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49-61-11
ALL ú ú 01 Page 402 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
ACCESS STATION 2160
BULKHEAD DOOR, 146AZ
SEE B C
BULK CARGO
COMPARTMENT
DOOR, 823R
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