S 762-173
(41)
Do a check of the airplane battery.
S 762-249
(42)
Put the dc meter select switch to the BAT position.
S 762-250
(43)
The voltmeter must read between 24 to 28 volts.
S 422-174
(44)
If the APU, megaphone, and emergency lights batteries were removed, install fully charged batteries (AMM 24-31-06/401, AMM 33-51-04/201, AMM 33-51-06/401, and AMM 33-51-07/201).
S 422-175
(45)
If the rack-mounted electronic modules were removed from the equipment racks, install cleaned, serviceable units (AMM 20-11-22/401).
S 422-176
(46)
If the IRS (Inertial Reference System) components were removed, install all units (AMM 34-21-01/401 and AMM 34-21-02/401).
S 092-269
WARNING:_______ FAILUARE TO REMOVE COVERS FROM PITOT PROBES BEFORE FLIGHT MAY
CAUSE LARGE ERRORS IN AIRSPEED-SENSING AND ALTITUDE-SENSING
SIGNALS, WHICH MAY LEAD TO LOSS OF SAFE FLIGHT.
CAUTION: MAKE SURE THE PITOT-STATIC PROBE COVERS ARE IN GOOD WORKING
_______ CONDITION WITH NO EVIDENCE OF DAMAGE, ESPECIALLY FRAYING AROUND THE COVER OPENING. FRAYED FIBERS FROM THE COVER COMBINED WITH OTHER SUBSTANCES SUCH AS DIRT, GREASE AND FLUIDS CAN CAUSE OBSTRUCTON IN THE PROBE.
CAUTION:_______REMOVE ALL COVERS. ENGINES SHOULD NOT BE OPERATED WITH COVERS IN PLACE BECAUSE THE COVERS CAN COME OFF AND DAMAGE THE ENGINES.
(47) Remove the pitot-static probe covers (4 places).
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747-400 MAINTENANCE MANUAL
S 092-271
(48)
Remove the "PITOT PROBES COVERED" tag from the left control wheel in the flight deck.
S 092-178
(49)
Remove the covers from the temperature probes, the angle-of-attack sensor, and the the ice detector probe (if installed).
S 092-272
WARNING:_______ FAILURE TO REMOVE BARRICADE TAPE AND VINYL ADHESIVE TAPE FROM
THE STATIC PORTS BEFORE FLIGHT MAY CAUSE LARGE ERRORS IN
AIRSPEED-SENSING AND ALTITUDE-SENSING SIGNALS, WHICH MAY LEAD
TO LOSS OF SAFE FLIGHT.
CAUTION:_______REMOVE ALL BARRICADE TAPE AND VINYL ADHESIVE TAPE. ENGINES SHOULD NOT BE OPERATED WITH COVERINGS IN PLACE BECAUSE THE COVERINGS CAN COME OFF AND DAMAGE THE ENGINES.
(50) Remove all barricade tape and vinyl adhesive tape from the static ports.
(a) Inspect each static port and if necessary use naphtha or equivalent to remove all tape residue, dirt and other contaminants around the static ports.
S 092-270
(51)
Remove the "STATIC PORTS COVERED" tag from the left control wheel in the flight deck.
S 612-179
(52)
Make sure all the fire extinguishers (Engine, APU, Portable) have been weighed within the 60 day period and are in the weight limits shown on the fire extinguisher nameplate.
(a) Reference: 1) AMM 26-26-01/601, Halon fire extinguisher.
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2) AMM 26-26-02/601, Water-type fire extinguisher.
S 282-180
(53) Make sure the pitot-static systems are drained.
NOTE: The drains are in the lower sections 41, 42, and 46.
____
There are 27 drains.
S 612-181
(54)
Service the windshield washer and rain repellent systems (AMM 12-16-01/301 and AMM 12-16-02/301).
S 712-182
(55)
Do the operational check for the electrical and electronic systems.
S 422-183
(56)
Install a clean coalescer in each water separator (AMM 21-51-05/201).
S 422-184
(57)
If the pressure controller and the pack and zone temperature controllers were removed, install serviceable units (Ref (AMM 21-31-02/401, AMM 21-61-01/401 and AMM 21-62-07/401).
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