(a)
Connect the electrical connector (2) to the pressure switch (3).
NOTE: Refer to this table for the equipment numbers.
____
~............................................................ | | Equipment Number | | Location ............................ | | Switch | Connector | .............................................................. | No. 2 Main Tank - Inbd | S238 | DS238 | | No. 2 Main Tank - Outbd | S239 | DS239 | | No. 3 Main Tank - Inbd | S240 | DS240 | | No. 3 Main Tank - Outbd | S241 | DS241 | | Center Wing Tank - Left | S66 | DS66 | | Center Wing Tank - Right | S68 | DS68 | 2.................................…...........…..............1
(b) Adjust the wire bundle as necessary to remove excessive slack and allow for an adequate drip loop (SWPM 20-10-11).
NOTE: This adjustment is necessary every time you change
____ pump configurations (pumps with face mounted and bracket mounted electrical connectors).
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747-400 MAINTENANCE MANUAL
(c) Connect the airplane wiring to the pump electrical
connector (5).
NOTE: Refer to this table for the equipment numbers.
____
~............................................................ | | Equipment Number | | Location ............................ | | Motor | Connector | .............................................................. | No. 2 Main Tank - Inbd | M223 | DM223 | | No. 2 Main Tank - Outbd | M222 | DM222 | | No. 3 Main Tank - Inbd | M226 | DM226 | | No. 3 Main Tank - Outbd | M227 | DM227 | | Center Wing Tank - Left | M224 | DM224 | | Center Wing Tank - Right | M225 | DM225 | 2.................................…...........…..............1
(d) Hand tighten the connector and then use a strap wrench to turn the connector 1/8 turn more.
S 284-180
(8) Measure the bonding resistance across the bonding jumpers (SWPM 20-20-00):
NOTE: The total resistance across each bond must not be more than
____
0.0002 ohm.
(a)
Measure resistance from motor/impeller unit body at least 0.25 inch (6.35 mm) away from bonding clip to the rear spar, at least 0.25 inch (6.35 mm) away from the bonding jumper attachment.
(b)
PUMPS WITH BRACKET MOUNTED ELECTRICAL CONNECTORS; Measure resistance from motor/impeller unit body at least 0.25 inch (6.35 mm) away from the bonding clip to the electrical connector bracket, at least 0.25 inch (6.35 mm) away from the bonding jumper attachment.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
S 284-210
(9) Measure the bonding resistance between the pressure switch body and the rear spar structure (SWPM 20-20-00).
NOTE: The bonding resistance must not be more than 0.050 ohm.
____
S 434-211
(10)
Do these steps to connect the pump electrical connector:
(a)
Adjust the wire bundle as necessary to remove excessive slack and allow for an adequate drip loop (SWPM 20-10-11).
NOTE: This adjustment is necessary every time you change
____ pump configurations (pumps with face mounted and bracket mounted electrical connectors).
(b) Connect the airplane wiring to the pump electrical connector (5).
NOTE: Refer to this table for the equipment numbers.
____
~............................................................ | | Equipment Number | | Location ............................ | | Motor | Connector | .............................................................. | No. 2 Main Tank - Inbd | M223 | DM223 | | No. 2 Main Tank - Outbd | M222 | DM222 | | No. 3 Main Tank - Inbd | M226 | DM226 | | No. 3 Main Tank - Outbd | M227 | DM227 | | Center Wing Tank - Left | M224 | DM224 | | Center Wing Tank - Right | M225 | DM225 | 2.................................…...........…..............1
(c)
Hand tighten the connector and then use a strap wrench to turn the connector 1/8 turn more.
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