S 434-038

 (11)
 Connect the electrical connector to the float switch receptacle.

 NOTE: Refer to the table for the equipment numbers.
____
 ~.................................................................
 |  |  Equipment Number  |
 | Location .......................... ..
 |  |  Switch  |  Connector  |

 ................................................................... | Surge Tank - Left Wing | S690 | DS690 | | Surge Tank - Right Wing | S691 | DS691 | 2......................................…...........…..............1
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A
747-400 MAINTENANCE MANUAL
 S 864-044
 (12) Supply the electrical power if it is not available (AMM 24-22-00/201).
 S 094-016
 WARNING: REFER TO AMM 27-81-00/201 FOR THE LOCK REMOVAL PROCEDURE.
_______ FLAPS WILL RETRACT IN 7 SECONDS AND COULD CAUSE INJURY TO PERSONS.
 (13) Remove the safety locks from the leading edge flaps (AMM 27-81-00/201).
 S 864-021
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LEADING
_______ EDGE AND TRAILING EDGE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
 (14)
 Retract the leading edge flaps (AMM 27-81-00/201).

 S 864-023

 (15)
 Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 (a)  
P415 Power Distribution Center - Right
 1) 415M14 FUEL OVERFILL CONT

 (16)
 Do the float switch operational test (AMM 28-21-12/501).

 S 714-019
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 WING SURGE TANK FLOAT SWITCH - ADJUSTMENT/TEST
______________________________________________
 TASK 28-21-12-715-001
 1.  Wing Surge Tank Float Switch Operational Test_____________________________________________
 A. General
 (1)  
The wing surge tank float switch operational test examines each float switch operation. During the test a ground is applied to the fueling shutoff relay. This tells the fuel quantity processor unit to close all the refuel valves.

 (2)  
The wing surge tank float switches operate when the surge tank fuel quantity is approximately between 27 to 50 gallons (102 to 190 liters). The quantity of fuel required to actuate the switch is dependent on wing loading and airplane attitude.

 WARNING: FAILURE TO OBEY THE APPROVED FUEL PRECAUTIONS CAN CAUSE THE
_______ IGNITION OF THE FUEL FUMES. THE FUEL TANK VENTS ARE IN EACH WINGTIP. THE GROUND SUPPORT EQUIPMENT MUST NOT BE PUT IN THESE AREAS BECAUSE DANGEROUS AND EXPLOSIVE FUEL FUMES CAN COLLECT.
 (3)  
All usual precautions must be followed during the pressure refuel operation. Use caution to prevent fuel leakage from the fuel tank vents. If leakage does occur, the fuel operation must be stopped immediately to decrease the risk of fire (AMM 12-11-01/301).

 B.
Equipment

 (1)  
Fueling truck with flowmeter or equivalent.

 (2)  
MIT65B00772 Receptacle assembly, fuel sampling

 C.
References

 (1)  
AMM 12-11-01/301, Fuel - Servicing

 (2)  
AMM 12-11-03/301, Fuel Sump - Servicing

 (3)  
AMM 20-41-01/201, Static Grounding

 (4)  
AMM 24-22-00/201, Manual Control

 (5)  
AMM 27-81-00/201, Leading Edge Flap System

 (6)  
AMM 28-13-00/001, Fuel Vent System

 (7)  
AMM 28-21-00/501, Pressure Fueling System

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