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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 WARNING: MAKE SURE THAT ALL PERSONNEL ARE CLEAR OF THE
_______ LANDING GEAR DOORS. THE RAPID MOVEMENT OF THE DOORS CAN INJURE PERSONS OR CAUSE DAMAGE TO EQUIPMENT.
 (b)  
Put the landing gear control handle in the OFF position.

 (c)  
Push the nose gear alternate extend switch on the pilots P2-3 panel to the EXTEND position.

 NOTE: Hold the switch for three to five seconds and return
____ the switch to the ARM position for a minimum of 90 seconds.
 (d)  
Make sure that the nose gear forward doors unlock and fall open.

 (e)  
Make sure that the nose gear alternate extension rotary actuator makes a full cycle.

 (f)  
Return the nose gear alternate extend switch on the pilots P2-3 panel to the OFF position.

 S 862-256
 (21)
 Apply pressure to the hydraulic systems number 1 and 4 (AMM 29-11-00/201).

 S 862-024

 (22)
 Move the nose and main gear ground door release handles to the door closed position.

 S 612-158

 (23)
 Service the shock struts for the landing gear (AMM 12-15-03/301, (AMM 12-15-04/301 and AMM 12-15-05/301).

 S 612-159

 (24)
 Inflate the tires to the correct pressures (AMM 12-15-06/301).

 S 162-160

 (25)
 Remove all of the corrosion preventive compound from the unpainted components on the landing gear. Soak and scrub the parts with BMS 3-2 and then vapor degrease the parts.

 S 142-161

 (26)
 Remove the unwanted MIL-G-25013 or MCS 352 grease from the surface of the inner cylinder which is open to the outside air.

 (27)
 Lubricate all of the landing gear fittings (AMM 12-21-01/301).

 (28)
 Depreserve each power plant if it was preserved (AMM 71-00-03/201).

 S 642-162
 S 632-164
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 632-165
 (29)
 Depreserve the APU and remove the exhaust and cooling air covers (AMM 49-11-00/201).

 S 212-166

 (30)
 Make sure all of the airplane drains are open and clean.

 S 112-167

 (31)
 Remove the strippable protective coating (AMM 51-24-12/701).

 S 952-168

 (32)
 Remove the tape and the covers from all of the doors, access panels and windows.

 S 012-244

 (33)
 Remove the cheesecloth covers, red flags, and tape from all of the vent and openings.

 S 952-169

 (34)
 Remove the reflective material from the surface of the windshields and windows.

 S 632-170

 (35)
 Remove the Leeder 306N protective coating with Leeder 302N remover.

 S 632-246

 (36)
 Apply a layer of remover approximately 20 mils thick and keep it on for a minimum of 10 minutes.

 S 632-247

 (37)
 Pressure rinse with water up to 140 °F.

 S 632-248

 (38)
 If the protective coating is not completely removed, do the steps to remove it again or remove it with solvent.

 CAUTION:_______ DO NOT LET THE REMOVER DRY.  DO NOT LET THE REMOVER TOUCH THE
 ACRYLIC FOR MORE THAN 60 MINUTES.  DO NOT LET THE REMOVER TOUCH
 HIGH-STRENGTH STEEL PARTS (180,000 PSI AND OVER).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 652-171
 (39)
 Service the fuel tanks if it is necessary for planned flight (AMM 12-11-01/301).

 S 792-172

 (40)
 Do a check of the fuel lines and component connections for leaks.
　
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