(g)
Put the refuel valve switches, MAIN 2 and MAIN 3, to the OPEN position.
NOTE: This will remove the pressure from the refuel/jettison
____ manifold. The blue indication lights for the refuel valves in the No. 2 and No. 3 main tanks will come on if the refuel/jettison manifold pressure is more than 6 psig and the refuel valve is operational.
1) If a blue indication light did not come on, it is possible that the refuel valve did not operate electrically. a) Use the manual method to open the applicable refuel
valve(s) (AMM 12-11-01/301). b) Wait for 5 minutes. c) Close the refuel valve(s) that were opened manually
(AMM 12-11-01/301).
(h)
After the blue indication lights for the refuel valves go off, wait for 5 minutes.
(i)
Put the refuel valve switches, MAIN 2 and MAIN 3, to the CLOSED position.
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747-400 MAINTENANCE MANUAL
F. Jettison Nozzle Valve Operational Test
S 715-053
(1)
Put the fuel jettison L-NOZZLE switch, on the fuel jettison module (P5 pilots' overhead panel) to the ON position.
S 715-054
(2)
Make sure the amber intransit VALVE light in the L-NOZZLE switch comes on and then goes off, followed by a white ON indication light.
S 715-055
(3)
Make sure the EICAS advisory message, JETT NOZ ON L, shows on the top EICAS display.
S 715-154
(4)
Put the fuel jettison NOZZLE-R switch on the fuel jettison module (P5 pilots' overhead panel) to the ON position.
S 715-056
(5)
Make sure the amber intransit VALVE light in the NOZZLE-R switch comes on and then goes off, followed by a white ON indication light.
S 715-153
(6)
Make sure these EICAS advisory messages show on the top EICAS display:
(a)
JETT NOZ ON R
(b)
JETT NOZ ON
S 715-057
(7)
Push the fuel jettison L-NOZZLE switch to the closed position (the white ON indication light does not show).
S 715-058
(8)
Make sure these EICAS advisory messages do not show on the top EICAS display:
(a)
JETT NOZ ON L
(b)
JETT NOZ ON
S 715-059
(9)
Make sure the EICAS advisory message, JETT NOZ ON R, shows on the top EICAS display.
S 715-060
(10)
Put the fuel jettison NOZZLE-R switch to the closed position (the white ON indication light does not show).
S 715-061
(11)
Make sure the EICAS advisory message, JETT NOZ ON R, does not show on the top EICAS display.
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747-400
MAINTENANCE MANUAL
S 865-191
(12)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
On the main power distribution panel, P6:
1) 6C18, JTSN NOZZLE VLV CONT R
2) 6D18, JTSN NOZZLE VLV CONT L
S 865-193
(13)
Make sure these EICAS messages show on the top EICAS display:
(a)
JETT NOZZLE L
(b)
JETT NOZZLE R
S 865-194
(14)
Make sure the amber VALVE intransit light shows in the L-NOZZLE and NOZZLE-R switches.
S 865-172
(15)
Close these circuit breakers and remove the DO-NOT-CLOSE tags:
(a)
On the main power distribution panel, P6:
1) 6C18, JTSN NOZZLE VLV CONT R
2) 6D18, JTSN NOZZLE VLV CONT L
S 715-245
(16)
Make sure these EICAS messages do not show on the top EICAS display:
(a)
JETT NOZZLE L
(b) 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：747-400 AMM 飛機維護手冊 燃油 FUEL 4(8)
