(6)
AIPC 28-41-11, Fig. 2
(7)
SSM 28-44-01
(8)
WDM 28-44-11, WDM 28-44-12
B.
Access
(1)
Location Zones 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right
C.
Procedure
S 864-002
(1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6, Main Power Distribution Panel
1) 6F6, FUEL SYS MGMT CH1
2) 6F8, FUEL SYS MGMT CH2
(2)
Defuel the applicable inboard main tank (AMM 28-26-00/201).
S 654-004
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A
747-400 MAINTENANCE MANUAL
RESERVE TANK TRANSFER SINGLE POINT SENSOR ASSEMBLY (REF ONLY)
SINGLE POINT SENSOR
SEE A
YELLOW WIRE
(HI-Z SHIELD)
GREEN WIRE (LO-Z)
WHITE WIRE
(HI-Z)
TERMINAL BLOCK
FUEL JETTISON SINGLE POINT SENSOR ASSEMBLY
SINGLE POINT SENSOR
COVER BRACKET
MOUNTING WASHER
BRACKET (2 LOCATIONS)
SCREW
FWD (2 LOCATIONS)
SINGLE POINT SENSOR
WASHER
(LEFT WING SHOWN,
(5 LOCATIONS)
RIGHT WING OPPOSITE)
SCREW
A (5 LOCATIONS)
Fuel Jettison Single Point Sensor Figure 401
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747-400 MAINTENANCE MANUAL
S 014-005
(3) Remove the applicable main fuel tank access door 544AB or 644AB (AMM 28-11-02/401).
NOTE: Main fuel tank access doors 544AB and 644AB are high impact
____ resistant doors and are not interchangeable with the usual doors (AMM 28-11-02/401).
S 654-021
WARNING: CAREFULLY DO ALL PROCEDURES TO DEFUEL AND GO INTO THE FUEL
_______ TANKS. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PROCEDURES.
(4)
Purge and go into the fuel tank (AMM 28-11-00/201).
S 034-007
(5)
Remove the nuts and washers that attach the airplane leads and sensor leads to the terminal block (3 locations).
NOTE: Make a record of the color and location of the leads to
____
make the installation easier.
S 034-008
(6)
Remove the screws and washers (5 locations) that attach the cover bracket to the mounting bracket.
S 034-009
(7)
Remove the screws and washers (2 locations) that attach the single point sensor to the mounting bracket.
(8)
Remove the sensor leads through the hole in the mounting bracket.
S 024-010
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747-400
MAINTENANCE MANUAL
S 024-020
(9) Remove the single point sensor from the airplane.
TASK 28-31-16-404-011
3. Fuel Jettison Single Point Sensor (SPS) Installation (Fig. 401)
____________________________________________________
A. References
(1)
AMM 28-11-00/201, Fuel Tanks
(2)
AMM 28-31-17/401, Fuel Jettison Single Point Sensor Control Card
(3)
AIPC 28-41-10, Fig. 1
(4)
AIPC 28-41-11, Fig. 2
(5)
SSM 28-44-01
(6)
WDM 28-44-11, WDM 28-44-12
B.
Access
(1)
Location Zones 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right
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