THROUGH LEAD (4 LOCATIONS) TERMINAL NUT PHASE LEAD(4 LOCATIONS)
(4 LOCATIONS)  A
1
FANNING
STRIP
TERMINAL NUT
WITH CAPTIVE

TERMINAL
WASHER BLOCK STUD

1
THROUGH LEAD
PHASE
LEAD
SQUARE
WASHER

SQUARE TERMINAL
WASHER
BLOCK STUD TERMINAL
BLOCK
TERMINAL

A
BLOCK
THROUGH
LEAD
A
A-A B
1
THERE IS AN OPTIONAL NUT, WITH CAPTIVE WASHER THAT MAY
BE USED INSTEAD OF TERMINAL SELF-LOCKING LOCKNUT AND
SEPARATE TERMINAL WASHER

IDG Terminal Block Assembly Figure 401
G73815
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 24-11-20
 ALL  ú ú 01 Page 402 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 034-013
 (3)  
Remove the self locking terminal nuts and washers, self locking nuts with captive washers or Spriolox nuts as applicable.

 S 034-015

 (4)  
Remove the phase leads.

 (a)  
Make sure the phase identification sleeving and the fanning strip is installed.

 S 034-016
 (5)  
Remove the terminal block screws.

 S 024-017

 (6)  
Remove the terminal block.

 (a)  
Move the terminal block to the input end of the IDG to remove it from the through-leads.

 S 034-018
 (7)  Remove the square washers from the terminal block.
 TASK 24-11-20-404-019
 3. Installation of the Terminal Block Assembly (Fig. 401)
___________________________________________
 A. References
 (1)  
AMM 71-00-00/501, Power Plant

 (2)  
AMM 78-31-00/201, Thrust Reverser System

 (3)  
AIPC 24-11-01, Fig. 2

 (4)  
WDM 24-11-11, WDM 24-11-12, WDM 24-11-13, WDM 24-11-14

 (5)  
SSM 24-11-01, SSM 24-11-02, SSM 24-11-03, SSM 24-11-04

 B.
Access

 (1)  
Location Zones 412 Engine 1 - Main Gearbox Aft Face 7 o'clock 422 Engine 2 - Main Gearbox Aft Face 7 o'clock 432 Engine 3 - Main Gearbox Aft Face 7 o'clock 442 Engine 4 - Main Gearbox Aft Face 7 o'clock

 (2)  
Access Panels
 415 Left Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 445 Left Thrust Reverser Half - Engine 4

 C.
Procedure

 (1)  
Install the square washers on the terminal block.

 S 434-020
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 ALL  ú ú 10 Page 403 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 CAUTION:_______ DEFORMED SQUARE WASHERS CAN CAUSE LOW CONDUCTIVITY OF THE PHASE LEADS. LOW CONDUCTIVITY OF THE PHASE LEADS CAN CAUSE HIGH PHASE LEAD TEMPERATURES. HIGH PHASE LEAD TEMPERATURES CAN CAUSE DAMAGE TO EQUIPMENT.
 (a)  Make sure the square washers are flat.
 CAUTION:_______ MAKE SURE THE TERMINAL BLOCK STUD THREADS ARE NOT GALLED OR DAMAGED. LOW TERMINAL NUT TORQUES WILL OCCUR TO THE PHASE LEADS. LOW TERMINAL NUT TORQUES WILL CAUSE LOW CONDUCTIVITY OF THE PHASE LEADS. LOW PHASE LEAD TEMPERATURES WILL CAUSE HIGH PHASE LEAD TEMPERATURES. HIGH PHASE LEAD TEMPERATURES CAN CAUSE DAMAGE TO EQUIPMENT.
 (b)  Replace the terminal block, if the terminal studs have any of the following conditions: 1) The terminal studs are loose. 2) The terminal stud threads are galled or damaged.
 (2)  S 424-021Install the terminal block.
 CAUTION:_______ MAKE SURE THE SQUARE WASHERS ARE INSTALLED BELOW THE THROUGH LEADS. SQUARE WASHERS INSTALLED ABOVE THE THROUGH LEADS ARE WILL CAUSE LOW PHASE LEAD CONDUCTIVITY. LOW PHASE LEAD CONDUCTIVITY WILL CAUSE HIGH PHASE LEAD TEMPERATURES. HIGH PHASE LEAD TEMPERATURES WILL CAUSE DAMAGE TO EQUIPMENT.
 (a)  Put the square washers below the through-lead straps.
　
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