28-21-12
ALL ú ú 05 Page 501 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(8)
AMM 28-22-16/401, Fuel System Card File
(9)
AMM 28-26-00/201, Defueling
(10)
AMM 28-41-00/501, Fuel Quantity Indicating System
(11)
AMM 32-09-02/201, Air/Ground Relays
D.
Access
(1)
Location Zones 125 Area Below Forward Cargo Container Compartment, Left 521 Leading Edge to Front Spar, Left 555 Surge Tank, Front Spar to Rear Spar, Left 621 Leading Edge to Front Spar, Right 655 Surge Tank, Front Spar to Rear Spar, Right
(2)
Access Panels
125B Electronics Access Door
521BB Fueling Station Access Door
521CB Fueling Control Panel Access Door
621BB Fueling Station Access Door
E.
Preconditions
S 865-053
(1)
These conditions are necessary for this task:
(a)
Pressure Fueling System serviceable (AMM 28-21-00/501).
(b)
A pressure refuel operation is necessary for this task (AMM 12-11-01/301).
NOTE: The reserve tanks are refueled until fuel overflows into
____
the surge tanks.
(c)
Electrical Power On (AMM 24-22-00/201).
(d)
Fuel System Card File serviceable (AMM 28-22-16/401).
(e)
Fuel Quantity Indication System (FQIS) serviceable (AMM 28-41-00/501).
(f)
Airplane must be in the ground mode (AMM 32-09-02/201).
F.
Prepare for the Test
S 495-002
WARNING: REFER TO AMM 27-81-00/201 FOR THE LOCK INSTALLATION PROCEDURE.
_______ THE FLAPS WILL RETRACT IN 7 SECONDS. INSTALL THE LOCKS TO PREVENT INJURY FROM THE ACCIDENTAL OPERATION OF THE FLAPS.
(1) Install the locks on all extended leading edge flaps
(AMM 27-81-00/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-21-12
ALL ú ú 04 Page 502 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 495-003
WARNING: THE AIRPLANE AND THE FUEL SOURCE MUST BE CORRECTLY GROUNDED
_______ BEFORE THE FUEL OPERATION. THIS WILL PREVENT A POSSIBLE FIRE OR EXPLOSION BECAUSE OF STATIC ELECTRICITY.
(2)
Ground the airplane and the fuel source (AMM 20-41-01/201).
S 015-007
(3)
Open the P42 refuel control panel door.
S 865-008
(4)
Make sure that the left and right wingtip pressure relief valves are closed (AMM 28-13-00/001).
S 495-005
(5)
Connect the refuel nozzle to the left wing refuel receptacle (AMM 12-11-01/301).
S 865-004
(6)
Supply electrical power (AMM 24-22-00/201).
S 015-046
(7)
Open the access door, 125B, and remove the screws (six locations) from the access cover on the M7860 fuel quantity processor unit (FQPU).
S 035-047
(8)
Remove the screws (two locations) from the VTO override switch guard to get to the switch.
S 865-009
(9)
Put the VTO override switch to the ON (override) position.
S 865-010
(10)
Make sure that these circuit breakers are closed:
(a)
On the main power distribution panel, P6:
1) 6D5, FUEL QTY 1
2) 6D6, FUEL QTY 2
3) 6F5, FUEL SYS MGMT CARD A
4) 6F6, FUEL SYS MGMT CH 1
5) 6F7, FUEL SYS MGMT CARD B
6) 6F8, FUEL SYS MGMT CH 2
(b)
On the overhead circuit breaker panel, P7:
1) 7H21, FUEL XFR VALVE MAIN 1
2) 7H22, FUEL XFR VALVE RES 2A & 3A
3) 7H23, FUEL XFR VALVE RES 2B & 3B
4) 7H24, FUEL XFR VALVE MAIN 4
(c)
On the DC power distribution panel, P180:
1) 180M8, FUELING VALVE 2
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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