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747-400 MAINTENANCE MANUAL
CAUTION: DO NOT TURN ON THE EMERGENCY LIGHT SYSTEM IF POWER
_______ HAS NOT APPLIED TO THE INSTALLED SYSTEM WHILE THE AIRPLANE WAS PARKED FOR 6 DAYS OR MORE. DO NOT TURN ON THE SYSTEM FOR A MINIMUM OF 90 MINUTES AFTER YOU APPLY ELECTRICAL POWER. DO NOT DO A FUNCTIONAL TEST UNTIL THE BATTERIES HAVE BEEN CHARGED FOR A MINIMUM OF 90 MINUTES. THIS IS NECESSARY BECAUSE THE SYSTEM MUST BE CHARGED BEFORE IT IS ABLE TO OPERATE CORRECTLY.
4) Do the system test of the emergency light system (AMM 33-51-00/501).
NOTE: The battery packs in the emergency light power
____ supplies are continuously charged when electrical power is supplied to the airplane, unless the emergency light switches are set to the on mode. If the battery packs are fully drained, maximum time necessary to charge them is 90 minutes.
(m) Make sure the applicable switches are returned to the correct position after the power is turned on.
S 863-046
(6) Make sure the flight deck has been warmed and maintained at or above -4°F (- 20°C) for 30 minutes, then do the steps that follow:
(a)
Disconnect the ground cart.
(b)
Close all panels as applicable.
1) Remove the heating hose to the Air Conditioning Access Door, 192HR and the Air Conditioning Access Door, 191NL conditioned air ground service panel.
2) Remove the heating hoses in the Main Equipment Center Access Panel, 117A. 3) Make sure the main equipment center bay door 117A is closed.
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747-400 MAINTENANCE MANUAL
(c) Make sure the outflow valves are in the OPEN position.
(d) Close the battery bus circuit breakers.
(e) Start the APU with the battery or ground power (AMM
49-11-00/201) .
NOTE:____ To improve starting capability of the APU at
temperatures below -40°F (-40°C), it may be desirable to
use low viscosity oil (MIL-L-7808).
The EICAS may indicate low APU oil quantity for the
first 5 minutes after the APU start or until the APU has
warmed up.
(f) Make sure the recirculation fan switches are in the ON
position.
(g) Close the pack and zone circuit breakers if they are open.
(h) Put all zone selectors in the 12 o'clock position.
(i) Make sure the Trim Air switches are ON.
(j) Turn the left and right pack switches to AUTO (AMM
21-00-00/201).
S 863-047 CAUTION: DO NOT CYCLE THE CONTROL COLUMN, WHEEL, RUDDER PEDALS, BRAKE
_______ PEDALS, GROUND SPOILERS, STABILIZER OR FLAPS UNTIL THE PUMPS HAVE RUN FOR AT LEAST 15 MINUTES.
(7) Turn on the hydraulic system electric motor pumps and air driven pumps, as applicable 30 minutes before starting the engines.
NOTE: This will make sure the hydraulic system operates normally
____ and will prolong the life of the components.
(a) Use alternating current motor pumps and air driven pumps, as applicable to pressurize the main hydraulic system (AMM 29-11-00/201).
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