(b)  
Install the backup rings and o-rings on the priority valve (25).

 (c)  
Remove the protective cap.

 (d)  
Install the priority valve flow control cartridge (25) in the flap control module (7).

 S 862-057
 (2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6, Main Power Distribution Panel
 1) 6L20, TE FLAP ELEC CONT INBD
 2) 6L19, TE FLAP ELEC CONT OTBD

 S 862-058
 (3)  
Supply electrical power (AMM 24-22-00/201).

 S 862-059

 (4)
Pressurize hydraulic systems No. 1 or No. 4 (AMM 29-11-00/201).

 S 792-065
 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.
 (5)  Extend and retract the flaps. Make sure there are no hydraulic leaks.
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747-400 MAINTENANCE MANUAL
 S 862-062
 (6)  Release the pressure in hydraulic systems No. 1 and No. 4 (AMM 29-11-00/201).
 S 092-097
 WARNING: CAREFULLY DO THE SPECIFIED TASK TO REMOVE THE DOOR LOCKS ON THE
_______ LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (7)  
Remove the door locks from the doors for the body landing gear (AMM 32-00-30/201).

 S 612-063

 (8)  
Fill the hydraulic reservoirs if it is necessary (AMM 12-12-01/301).

 S 862-064

 (9)  
Remove electrical power (AMM 24-22-00/201).

 TASK 27-51-10-712-098
 12. Operational Test - Priority Valve_________________________________
 NOTE: This is a scheduled maintenance task.
____
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

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

 B.
Access

 (1)  
Location Zone
 221/222 Control Cabin

 C.
Procedure

 S 862-073
 (1)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P415, Right Power Distribution Panel
 1) 415A32, TE FLAP ELEC INBD
 2) 415M38, TE FLAP ELEC OTBD

 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 862-075
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 S 862-076
 (3)  Pressurize the hydraulic systems No. 1 and No. 4 with a hydraulic service cart (AMM 29-11-00/201).
 NOTE: If only 1 hydraulic service cart is available, you must
____ do this test 2 times. One time with the hydraulic system No. 1 pressurized for the inboard flaps then with the hydraulic system No. 4 pressurized for the outboard flaps.
 S 712-072
 (4)  Do a check of the priority valve function with low hydraulic pressure:
 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.
 (a)  
Move the flap control lever to the 10-unit detent to extend the leading edge and trailing edge flaps.

 (b)  
Decrease the hydraulic pressure to 1650 psi (11.4 megapascal).

 (c)  
Move the flap control lever to the 20-unit detent.

 NOTE: With the hydraulic pressure reduced, the EICAS message
____ FLAPS PRIMARY will be displayed. The EICAS can display the message FLAPS DRIVE.
　
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