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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 EXTERNAL POWER RECEPTACLE - INSPECTION/CHECK
____________________________________________
 1.  General_______
 A.  This procedure contains three tasks.
 (1)  
External Power Receptacle Visual Inspection.

 (2)  
External Power Receptacle Pin Inspection.

 (3)  
External Power Receptacle Neutral Pin to Nose Gear Grounding Stud Continuity Check

 B.  
The external power receptacles (receptacle) may show worn areas and oxidization with usual use. The worn areas and the oxidation can cause an incorrect electrical connection between the plug and the receptacle.

 C.  
The visual inspection will make sure that the receptacle is in a good condition. In the visual inspection you will look for cracks in the receptacle case. You will make sure that the wires are in a good condition and connected correctly.

 D.  
The pin inspection uses a wear gage to do a GO-NO-GO test of the receptacle pins. The gage is made of a plug and a receptacle on a common shaft. The plug side of the gage is used to examine the pins on the receptacle. If you find worn pins, you will have to replace the receptacle. The receptacle side of the gage is used to examine the plug on the power cart. You must use the service procedure for the ground support equipment to do this test.

 E.  
You use a low resistance ohmmeter to measure the resistance between the neutral pins on the external power receptacles and the grounding stud on the nose gear.

 F.  
The two external power receptacles (No. 1 - D51, No. 2 - D52) are installed aft of the wheel well for the nose gear and forward of the E/E rack.

 TASK 24-41-03-206-001
 2.  External Power Receptacle Visual Inspection (Fig. 601)___________________________________________
 A.  References
 (1)  
AIPC 24-41-03, Fig. 1

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
SSM 24-41-01, SSM 24-41-02

 (4)  
WDM 20-20-00, WDM 24-41-13, WDM 24-41-23

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

SEE A
EXTERNAL POWER RECEPTACLE NO. 2, D52 EXTERNAL POWER RECEPTACLE DOOR
EXTERNAL
10
POWER
LB
TENSION
RECEPTACLE
SCALE
NO. 1, D51
GAGE 
TESTER 
FWD 
EXTERNAL POWER RECEPTACLE, P36
A 
RECEPTACLE 
GROUND 
POWER  GAGE 
PLUG  TESTER 

EXTERNAL POWER TEST SET
External Power Receptacle Inspection Figure 601
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 24-41-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 B. Equipment
 (1)  
Bonding Meter - Avitron, Model T207 TYW

 C.
Access

 (1)  
Location Zone
 118 Electrical and Electronics Compartment, RH

 (2)  
Access Panel
 118A External Power Receptacle Door

 D.
Prepare to examine the External Power Receptacles

 S 016-004
 (1)
Open the door 118A for the external power receptacle (receptacle).

 S 016-005

 (2)  
Open the floor panels, in the lower lobe, on the right side of the E/E rack to get access to the receptacles.

 S 036-006

 (3)  
Remove three nuts that hold the two conductor guards to the
 receptacle pan.

 S 016-016

 (4)  
Remove the wire guard from the two receptacles.

 E.
Examine The External Power Receptacle

 S 216-007
 (1)  
　
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