PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
PDOS -ACTUATION AND CONTROL SWITCHES
EFFECTIVITY BEJ ALL 71-12-00
Page 9
D633W101-BEJ Sep 05/2002
PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
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71-12-00
Page 10 D633W101-BEJ Sep 05/2002
PDOS -PUMP/POWER PACK
The pump/power pack supplies hydraulic power to the cowl opening actuators. The actuators open and close the fan cowls and thrust reverser halves.
These are the parts of the pump/power pack:
*
Housing
*
Reservoir
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Solenoid valves (5)
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Electric motor
*
Manual drive.
Housing
The pump/power pack parts attach to the housing. The housing contains the pump drive shaft and the pump/power pack filter element. The filter element is under the high pressure filter plug.
There are four connectors for hydraulic supply lines to the cowl opening actuators. There is one electrical connector for the solenoid valves.
Reservoir
The reservoir attaches to the housing. The reservoir has a vent and an oil filler cap with a dipstick on it
Solenoid Valves
Five solenoid valves attach to the housing. The solenoids get power from the 28v dc ground handling bus when you push the actuation and control switches.
Electric Motor
The electric motor turns the hydraulic pump. It gets electrical power from the 115v ac ground handling bus.
Manual Drive Lug
The manual drive lug is on the housing and connects to the pump drive shaft. You use a 3/8 inch square drive to turn the manual drive. A decal on the reservoir shows you how to manually operate the pump/power pack.
Training Information Point
The PDOS pump/power pack filter is an LRU.
You service the PDOS pump/power pack with engine oil.
WARNING: USE THE FALL ARREST LIFELINE PROCEDURE IF YOU DO NOT USE OTHER SAFETY EQUIPMENT. IF YOU DO NOT, YOU COULD FALL AND CAUSE INJURY OR DEATH.
EFFECTIVITY BEJ ALL 71-12-00
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D633W101-BEJ Sep 05/2002
PDOS -PUMP/POWER PACK
CAUTION: DO NOT FILL THE PDOS PUMP WITH OIL WITH THE FAN COWL PANELS OR THE THRUST REVERSERS IN THE OPEN POSITION. IF YOU FILL THE PDOS PUMP WITH THE COWLS OPEN, THERE WILL BE TOO MUCH OIL IN THE SYSTEM AND DAMAGE CAN OCCUR.
CAUTION: DO NOT OVERFILL THE PDOS PUMP. IF YOU OVERFILL THE PDOS PUMP, DAMAGE TO THE PDOS SYSTEM COULD OCCUR.
This is a summary of the procedure to add oil to the PDOS pump:
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Make sure the fan cowl panels and the thrust reversers are in the closed position
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Examine the oil level on the fill port dipstick
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If the oil level is low, fill the PDOS pump with the specified engine oil to the mark on the dipstick
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