(2)
Ensure control valve indicator is on POS-2.
NOTE: Control valve is on left wheel well aft bulkhead.
(3)
Provide electrical power to the airplane.
(4)
Check that main cargo door control circuit breaker on load control center P6 is closed.
(5)
Ensure landing gear failure warning and parking brake circuit breaker is closed on load control center P6.
(6)
Ensure parking brake is set.
NOTE: If airplane is on jacks, compress right gear approximately six inches.
(7)
Open lift actuator access door.
CAUTION: LIFT ACTUATOR ACCESS DOOR MUST BE OPEN TO PREVENT DAMAGE TO CEILING PANEL DURING MAIN CARGO DOOR OPERATION.
(8)
Fold both main cargo door hatracks to the up-and-locked position.
(9)
Connect hydraulic test bench to ground service module.
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C. Bleed and Fill System
(1)
Operate external lock handle to unlocked position.
(2)
Slowly increase hydraulic pressure to 3000 PSIG and check hydraulic components and fittings for leaks.
(3)
Using main cargo switch No. 1, operate door through 10 complete cycles between closed and canopy positions, gradually increasing opening until canopy position is reached. Repeat cycle as required until operation is smooth and quiet.
(4)
With door at canopy position and using switch No. 2, gradually raise and lower door (increasing opening until full-open position is obtained). Cycle as required until door operation is smooth and quiet.
(5)
Close main cargo door.
(6)
Slowly increase hydraulic pressure to 3400 (+50/-50) PSIG and hold for minimum of five minutes. There should be no evidence of leakage from any main cargo door hydraulic lines or components.
(7)
Raise main cargo door to full-open position and repeat step (6).
(8)
Close main cargo door and reduce hydraulic pressure to zero.
(9)
Lock main cargo door.
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D. Restore Airplane to Normal
(1)
Close lift actuator access door.
(2)
Disconnect test bench.
(3)
Replace any panels removed to observe hydraulic lines or components.
(4)
Determine whether there is any further need for electrical power on the airplane; if not, remove electrical power.
3. Bleed and Fill Main Cargo Door Hydraulic System (Handpump)
A. Prepare to Bleed and Fill
(1)
Open main cargo door control circuit breaker on load control center P6.
(2)
Open lift actuator access door.
CAUTION: LIFT ACTUATOR ACCESS DOOR MUST BE OPEN TO PREVENT DAMAGE TO CEILING PANEL DURING MAIN CARGO DOOR OPERATION.
(3)
Fold main cargo door hatracks to up-and-locked position.
B. Bleed and Fill System
(1)
Operate external lock handle to unlocked position.
(2)
Manually operate control valve to POS-1.
NOTE: Control valve is on left wheel well aft bulkhead adjacent to handpump.
CAUTION : CONTROL VALVE MOTOR MAY BURN OUT IF CONTROL VALVE IS MANUALLY POSITIONED WHILE ELECTRICAL POWER IS APPLIED TO MOTOR. ENSURE MAIN CARGO DOOR CONTROL CIRCUIT BREAKER IS OPEN AND SUITABLY TAGGED TO PREVENT INAVERTENT CLOSING.
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(3)
Using main cargo door handpump, operate door through 10 complete cycles between closed and canopy positions, gradually increasing opening until canopy position is reached. Repeat cycle as required until operation is smooth and quiet.
NOTE: Manually operate control valve to POS-2 when closing door and to POS-1 when opening door. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737 AMM 飞机维护手册 舱门 DOORS(83)
