S 865-024

 (5)  
Release the pressure in hydraulic system No. 1 and 4 (Ref 29-11-00/201).

 S 415-025

 (6)
Install the access panels on the movable flap track fairings.

 TASK 27-51-09-705-026
 3. Flap Power Package Operational Test
___________________________________
 A. Standard Tools and Equipment
 (1)  
Spring scale, 0 to 15 pound range

 B.
References

 (1)  
24-22-00/201, Manual Control

 (2)  
29-11-00/201, Main Hydraulic Supply System

 (3)  
32-00-30/201, Landing Gear Door Locks

 C.
Prepare for the Test

 S 865-027
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 865-028

 (2)
Pressurize hydraulic systems No. 1 and 4 (Ref 29-11-00/201).

 S 015-029

 (3)
Remove the access panels from all movable flap track fairings.

 (4)
Make sure that the landing gear ground locks are installed.

 S 495-030
 S 495-031
 WARNING: CAREFULLY DO THE SPECIFIED TASK TO INSTALL THE DOOR LOCKS ON
_______ THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE EQUIPMENT.
 (5)  
Install the door locks on the doors for the body landing gear (Ref 32-00-30/201).

 D.
Do a Test of the Flap Hydraulic Operation

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 S 865-046
 WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
 FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP
 CONTROL LEVER.  WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL
 MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP

 CONTROL LEVER.
 (1)  
Put the flap control lever in the 30-unit detent to extend the flaps.

 (a)  
Make sure that the ball screw nuts do not touch the downstops.

 S 865-042
 (2)  
Put the flap control lever in the UP detent to retract the flaps.

 (a)  
Make sure that the ball screw nuts do not touch the upstops.

 S 715-034
 (3)  Do a test of the hydraulic operation time for the trailing edge flaps.
 NOTE: A minimum of 35 gpm for the inboard flap power package and 25
____ gpm for the outboard flap power package is necessary.
 (a)  
Make sure that hydraulic systems No. 1 and 4 are pressurized.

 (b)  
Move flap control lever from the UP detent to the 30-unit detent.

 (c)  
Make sure that the time for the flaps to extend to the 30-unit position is 40 to 55 seconds.

 (d)  
Make sure that the time difference between the inboard and outboard flaps is not more than 10 seconds.

 (e)  
Move the flap control lever from the 30-unit detent to the UP detent.

 (f)  
Make sure that the time necessary for the flaps to retract is 40 to 55 seconds.

 (g)  
Make sure that the time difference between the inboard and outboard flaps is not more than 10 seconds.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 03 Page 507 ú Oct 10/94
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A
747-400 MAINTENANCE MANUAL
 E. Do a Test of the Operation of the Flap Alternate Drive
 S 865-043
 (1)  
Make sure that hydraulic systems No. 1 and 4 are pressurized.

 S 715-044

 (2)  
Do a test of the ALTN FLAP ARM switch.

 (a)  
Push the ALTN FLAPS ARM switch to put the flaps in alternate control. 1) Make sure the ALTN FLAPS EXT/RET switch is in the OFF
　
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