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747-400 MAINTENANCE MANUAL
 S 865-083
 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.
 (6)  Retract the leading edge flaps with the alternate
 extension/retraction system (AMM 27-81-00/201).

 J. Leakage Test of the Engine Bleed Air Ducts Upstream of the PRSOV
 S 015-043
 (1)  
Open the thrust reverser halves (AMM 78-31-00/201).

 S 865-070

 (2)  
For the applicable engine,
 Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel
 1) 6F01, ENG 1 IGN 1
 2) 6F02, ENG 2 IGN 1
 3) 6F03, ENG 3 IGN 1
 4) 6F04, ENG 4 IGN 1
 5) 6G19, STBY IGN ENG 1
 6) 6G20, STBY IGN ENG 2
 7) 6G21, STBY IGN ENG 3
 8) 6G22, STBY IGN ENG 4
 9) 6J18, ENG START AIR CONT
 10) 6K19, ENG 1 IGN 2
 11) 6K20, ENG 2 IGN 2
 12) 6K21, ENG 3 IGN 2
 13) 6K22, ENG 4 IGN 2
 14) 6L10, ENG 1 FUEL CONT VLV
 15) 6L11, ENG 2 FUEL CONT VLV

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MAINTENANCE MANUAL

4540 3530252015
DUCT AIR PRESSURE - PSIG
Bleed Air Ducting Leakage Test Limits Figure 501
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747-400 MAINTENANCE MANUAL
 16) 6L12, ENG 3 FUEL CONT VLV 17) 6L13, ENG 4 FUEL CONT VLV S 035-085 CAUTION: FAILURE TO DISCONNECT ELECTRICAL CONNECTOR WILL RESULT IN
_______ MOTORING OF ENGINE WHEN "START" SWITCH IS PULLED OUT.
 (3)  Disconnect the electrical connector, DV351 from the applicable engine start valve (Refer to AMM 80-11-02/401 to get access to the start valve).
 (4)  S 865-071Remove the DO-NOT-CLOSE tag and close the 6J18 ENG START AIR CONT circuit breaker on the P6 main power distribution panel.
 (5)  S 865-072Pressurize the pneumatic system to above 20 psig.
 (6)  S 865-073Put the applicable ENGINE BLEED switch in the ON position.
 (7)  S 865-150Pull out the applicable engine START switch on the P5 overhead panel.
 S 985-075

 WARNING: USE A RATCHET WRENCH TO TURN THE PRV MANUAL OVERRIDE DRIVE.
_______ THE PRV MAY OPEN SUDDENLY WHEN YOU TURN THE MANUAL OVERRIDE DRIVE. THE MANUAL OVERRIDE DRIVE COULD PULL THE WRENCH OUT OF YOUR HANDS IF YOU DO NOT USE A RATCHET-DRIVE WRENCH.
 (8)  
Carefully turn the PRV manual override drive on the applicable engine to the OPEN position.

 (a)  
Make sure the PRV stays in the open position.

 S 865-077
 (9)  
Increase the pneumatic system pressure to 44-46 psig.

 S 795-078

 (10)
 Examine all of the ducts and couplings forward of the PRSOV.

 NOTE: A small quantity of leakage is permitted from the
____ joints. There must not be a high concentration of leakage from the joints. A high concentration of air flow can be felt by the hand at a distance of 12 inches from the leakage source.
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