S 032-093
CAUTION: FAILURE TO DISCONNECT ELECTRICAL CONNECTOR WILL RESULT IN
_______ MOTORING OF ENGINE WHEN "START" SWITCH IS PULLED OUT.
(6) Disconnect the electrical connector, DV351, from the engine start valve (Refer to AMM 80-11-02/401 to get access to the start valve).
S 862-058
(7) Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a) Main Power Distribution Panel, P6
1) 6J18 ENG START AIR CONT
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747-400 MAINTENANCE MANUAL
S 862-059
(8)
Pressurize the pneumatic system to above 20 psig using a ground cart or the APU.
S 862-060
(9)
Put the applicable ENGINE BLEED switch to the ON position.
S 862-061
(10)
Pull out the applicable engine START switch on the P5 overhead panel
S 862-062
WARNING: USE A RATCHET WRENCH TO TURN THE PRV MANUAL OVERRIDE DRIVE.
_______ THE PRV CAN OPEN QUICKLY WHEN YOU TURN THE MANUAL OVERRIDE DRIVE. THIS CAN PULL THE WRENCH OUT OF YOUR HANDS AND CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(11)
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.
TASK 36-00-00-862-022
6. Release the Pressure in the Pneumatic System____________________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 49-11-00/201, Auxiliary Power Unit
(3)
AMM 71-00-00/201, Power Plant
(4)
AMM 78-31-00/201, Thrust Reverser System
B.
Procedure
S 862-023
(1)
Shut down the ground air source, APU (AMM 49-11-00/201), or engines (AMM 71-00-00/201), as applicable.
(2)
Supply electrical power (AMM 24-22-00/201).
S 862-024
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S 862-049
(3) If the procedure to pressurize the pneumatic system upstream of the PRSOV was done, do these steps before you release the pressure:
WARNING: DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER TO
_______ PREVENT THE OPERATION OF THE THRUST REVERSER. ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(a)
Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).
(b)
Open the fan cowl panels (AMM 71-11-04/201).
(c)
Open the core cowl panels (AMM 71-11-06/201).
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU OPEN THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
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