(3)  
For the applicable engine, remove DO-NOT-CLOSE tags and close these circuit breakers as follows:

 (a)  
P6 Main Power Distribution Panel
 1) 6G15 SCU ALT PWR ENG 1
 2) 6G16 SCU ALT PWR ENG 2
 3) 6G17 SCU ALT PWR ENG 3
 4) 6G18 SCU ALT PWR ENG 4

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5) 6) 7) 8)  6G23 ENG SCU 16G24 ENG SCU 26G25 ENG SCU 36G26 ENG SCU 4
 (4)  S 714-040-N00Start the engine with AUTOSTART to do a test for the correct operation of the SCU (AMM 71-00-00/201).
 (5)  S 714-015-N00Do the test for the supplemental control unit (SCU) that is shown in the Power Plant Test Reference Table (AMM 71-00-00/501).

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SCU PROGRAMMING PLUG - REMOVAL/INSTALLATION
___________________________________________
 1.  General
_______
 A.  This procedure gives the instruction for the removal and installation of the SCU programming plug.
 B.  The programming plug is connected on the aft end of the supplemental control unit (SCU). The SCU is installed on the fan case at the 3 o'clock position.
 C.  Open the right fan cowl panel to get access to the programming plug.
 TASK 73-21-16-004-013-N00
 2.  Remove the SCU Programming Plug (Fig. 401)
_______________________________
 A.  References
 (1)  
AMM 71-11-04/201, Fan Cowl Panels

 B.  
Access

 (1)  
Location Zone
 412 Engine 1 - Fan Case 3 o'clock
 422 Engine 2 - Fan Case 3 o'clock
 432 Engine 3 - Fan Case 3 o'clock
 442 Engine 4 - Fan Case 3 o'clock

 (2)  
Access Panel
 414 Right Fan Cowl Panel - Engine 1
 424 Right Fan Cowl Panel - Engine 2
 434 Right Fan Cowl Panel - Engine 3
 444 Right Fan Cowl Panel - Engine 4

 C.  
Prepare to Remove the SCU Programming Plug

 S 864-001-N00
 (1)  
For the applicable engine, open these circuit breakers and attach the DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel
 1) 6G15 SCU ALT PWR ENG 1

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE  A 
FAN CASE 
(SCU) SUPPLEMENTAL CONTROL UNIT 

SCU 
PROGRAMMING 
PLUG 
SEE  B 
FWD 
A 
SCU 
LANYARD PROGRAMMING 
PLUG 
LANYARD 
SEE  C 
RIVET PIN  FWD 
COLLAR 
C  B 
SCU Programming Plug Installation 
Figure 401 

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2) 6G16 SCU ALT PWR ENG 2
 3) 6G17 SCU ALT PWR ENG 3
 4) 6G18 SCU ALT PWR ENG 4
 5) 6G23 ENG SCU 1
 6) 6G24 ENG SCU 2
 7) 6G25 ENG SCU 3
 8) 6G26 ENG SCU 4

 S 014-002-N00
　
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