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A
747-400 MAINTENANCE MANUAL
S 865-095
(28)
Close this circuit breaker:
(a)
On the P7 panel:
1) 7H22, FUEL XFR VALVE RES 2A & 3A
S 745-096
(29) Make sure that the Bit 13 is "0" (Reserve 3A valve agree).
TASK 28-22-14-725-012
5. Valve Position Logic Card A12 Operational Test______________________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 28-22-16/401, Fuel System Card File
(3)
AMM 31-61-00/501, Intergrated Display System (IDS)
(4)
AMM 32-09-02/201, Air/Ground Relays
(5)
AMM 34-61-02/401, Control Display Unit
(6)
AMM 45-10-00/201, Central Maintenance Computer System
B.
Access
(1)
Location Zones
221 Control Cabin, Left
222 Control Cabin, Right
(2)
Access Panel
521CB Refuel Control Panel Access Door
C.
Preconditions
S 865-122
(1)
These conditions are necessary for this task:
(a)
Reserve Tank Transfer System serviceable.
(b)
Fuel Feed System serviceable.
(c)
APU Fuel-Feed System Serviceable
(d)
Fuel Jettison System serviceable.
(e)
A specific fuel quantity is not necessary for this task.
(f)
Electrical Power On (AMM 24-22-00/201).
(g)
Fuel System Card File serviceable (AMM 28-22-16/401).
(h)
Integrated Display System (IDS) serviceable (AMM 31-61-00/501).
(i)
Airplane must be in the ground mode (AMM 32-09-02/201).
(j)
CDU installed (AMM 34-61-02/401).
(k)
Central Maintenance Computer (CMC) serviceable (AMM 45-10-00/201).
D.
Procedure
(1)
Supply electrical power (Ref 24-22-00/201).
S 865-014
(2)
Open this circuit breaker:
(a)
On the main power distribution panel P6: 1) 6C18, JTSN NOZZLE VLV CONT R
S 865-013
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747-400 MAINTENANCE MANUAL
(3) S 725-045Make sure that the EICAS message "JETT NOZZLE R" shows on the top EICAS display.
(4) S 865-115Close this circuit breaker: (a) On the P6 panel: 1) 6C18, JETT NOZZLE VLV CONT R
(5) S 725-063Make sure the EICAS status message, JETT NOZZLE R, does not show on the top EICAS display.
(6) S 865-044Open this circuit breaker: (a) On the P6 panel: 1) 6F17, CTR L & MAIN 3 JTSN VLV
(7) S 865-046Make sure this circuit breaker is closed: (a) On the P6 panel: 1) 6E17, CTR R & MAIN 2 JTSN VLV
(8) S 725-016Make sure the EICAS status message, JETT XFER VLV, shows on the bottom EICAS display.
(9) S 865-017Close this circuit breaker: (a) On the P6 panel: 1) 6F17, CTR L & MAIN 3 JTSN VLV
S 725-018
(10) Make sure the EICAS status message, JETT XFER VLV, does not show on the bottom EICAS display.
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A
747-400 MAINTENANCE MANUAL
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