(4)
With door at canopy position, raise and lower door, gradually increasing opening until full-open position is obtained. Cycle as required until operation is smooth and quiet.
(5)
With door at ful1-open position, manually operate control valve to POS-2 and operate handpump until door begins to close. The door should close to canopy position (actuator ram lock position).
NOTE: Do not operate handpump when door is closing. Handpump needs to be operated only to release ram lock in actuator or to drive door overcenter when closing door from full open position.
(6)
Operate handpump to release ram lock and allow to close.
(7)
Operate handpump until door is completely closed and latched.
(8)
Lock main cargo door.
C. Return Airplane to Normal
(1)
Close lift actuator door.
(2)
Replace any panels removed to observe hydraulic lines or components.
(3)
Close main cargo door control circuit breaker.
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MAIN CARGO DOOR SYSTEM - ADJUSTMENT/TEST
EFFECTIVITY
Passenger/Cargo Convertible Airplanes
1. Main Cargo Door System Test
A. General
(1)
The purpose of this procedure is to test all operating components of the main cargo door, including actuators, canopy switches, door position switch, lock switch, and lockpin switches. Refer to 52-71-0, Adjustment/Test, for door warning circuits test.
(2)
Prior to test the door shall be properly adjusted and checked for operating clearances. For adjustment procedures on door components, refer to 52-32-11, Adjustment/Test. Filling and bleeding of the A, B, standby, and main cargo door hydraulic systems shall have been completed (Ref Main Cargo Door System, Maintenance Practices and Chapter 29).
B. Prepare to Test
(1)
Provide electrical power to the airplane.
(2)
Check that following circuit breakers on load control center P6 are closed:
(a)
Hydraulic System B Pumps
(b)
Main Cargo Door Control
(c)
Indicator lights, Master Dimming Bus (9 places)
(d)
Landing Gear Failure Warning and Parking Brake
(e)
Landing Gear Indicating Lights
(3)
Ensure main cargo door is closed.
(4)
Remove panels over latch actuator (Ref 52-32-81).
Feb 01/76 52-32-0 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(5)
Ensure main cargo door control valve indicator is on POS-2.
NOTE: Control valve is on left wheel well aft bulkhead.
(6)
Open lift actuator access door.
CAUTION: LIFT ACTUATOR ACCESS DOOR MUST BE OPEN TO PREVENT DAMAGE TO CEILING PANEL DURING MAIN CARGO DOOR OPERATION.
(7)
Ensure parking brake is set.
NOTE: If airplane is on jacks, compress right main gear approximately 6 inches.
(8)
Pressurize hydraulic system B (Ref Chapter 29).
C. Test Main Cargo Door System
CAUTION: PERSONNEL AND EQUIPMENT MUST BE CLEAR OF MAIN CARGO DOOR PATH.
(1)
Operate external lock handle to unlocked position. Check that amber door-unlocked light on main cargo door control panel illuminates.
(2)
Operate main cargo door switch No. 1 to UP TO CANOPY. Check door does not open.
(3)
Deleted.
(4)
Repeat step (2). Results should be similar.
(5)
Lower forward hatrack and fold main cargo door aft hatrack to up and locked position.
(6)
Repeat step (2).
(7)
Deleted.
(8)
Operate main cargo door switch No. 1 to UP TO CANOPY. Check that door raises; then release switch before door reaches canopy position. Check that door stops.
(9)
Using switch No. 1, close main cargo door but keep external lock handle in unlocked position. Check that door-unlocked light on main cargo door control panel remains illuminated.
(10)
Operate external lock handle to locked position. Check that door-unlocked light extinguishes.
(11)
Disconnect wire from terminal 10 and terminal 11 of terminal strip T259 and unlock door. Check that door-unlocked light and main cargo door warning light on forward overhead panel P5 are extinguished.
NOTE: Terminal strip T259 is located behind ceiling panel inboard of aft section of main cargo door hinge line. For removal of ceiling panel, refer to Chapter 25, Passenger Cabin Lining and Insulation. 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(84)
