R **ON A/C 301-399,
R (Ref. Fig. 005)
R **ON A/C ALL
A detailed description of the bypass valve is given in (Ref. 32-31-00).
7. Operation/Control and Indicating
________________________________
A. Ground Door-Opening for Maintenance
When the ground door-opening handle is operated, it pulls a teleflex cable which moves the lever on the bypass valve through 90 degrees. The initial movement of the ground door-opening handle causes the bypass valve to:
-isolate the door-close hydraulic supply from the door actuating-cylinder
-connect the two chambers of the MLG door actuating-cylinder together.
At the same time, the hook of the door uplock is released. Gravity then opens the main door, which causes the hydraulic fluid to move from one side of the door actuating-cylinder to the other. The main door opens slowly because some cavitation occurs in the door actuating-cylinder.
A more detailed operation sequence is given in (Ref. 32-31-00).
B. Ground Door-Closing after Maintenance
The Green hydraulic system must be pressurized before the ground door-opening handle can be moved. A locking plunger in the bypass valve stops movement of the handle, if the hydraulic system is not pressurized.
1EFF : ALL 1 32-12-00Page 17 1 1 May 01/04 1 1 1CES 1 When the ground door-opening handle is turned towards the closed position, it pushes the teleflex cable. This moves the lever of the bypass valve. The valve then isolates the chambers of the main door actuator from each other and connects them to the hydraulic supply. At the same time, the rod to the uplock moves the ground release mechanism in the door uplock to its initial position. The main door actuator then closes the main door, and the uplock closes to hold the door actuating-cylinder in the closed position.
A more detailed operation sequence is given in (Ref. 32-31-00).
8. BITE Test_________
Not applicable
1EFF : ALL 1 32-12-00Page 18 1 1 May 01/04 1 1 1CES 1
MAIN GEAR DOORS - MAINTENANCE PRACTICES
_______________________________________ TASK 32-12-00-010-001 Open the Main Gear Doors for Access WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU
_______ START A TASK ON OR NEAR:
-
THE FLIGHT CONTROLS
-
THE FLIGHT CONTROL SURFACES
-
THE LANDING GEAR AND THE RELATED DOORS
-COMPONENTS THAT MOVE. WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
_______ GEAR.
1. Reason for the Job
__________________
To open the main landing-gear (MLG) doors for access to equipment installed in zones 147 and 148.
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific safety barriers No specific warning notice 460005835 1 GROUND LOCK SLEEVE
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
32-00-00-481-002 Installation of the Safety Devices on the Landing Gear Doors 32-12-00-991-001 Fig. 201
1EFF : ALL 1 32-12-00Page 201 1 1 Feb 01/98 1 1 1CES 1
3. Job Set-up
__________
Subtask 32-12-00-941-051
A. Safety Precautions
(1)
In the cockpit, make sure that: - on the panel 400VU, the landing-gear control-lever 6GA is in the DOWN position
- on the panel 110VU, the GRAVITY GEAR EXTN handle is folded into the center console.
(2)
Put the safety barriers in position to prevent access to the range(s) of travel of the applicable MLG door(s).
4. Procedure
_________ (Ref. Fig. 201/TASK 32-12-00-991-001) Subtask 32-12-00-010-050 R A. Open the Applicable Door(s) WARNING : MAKE SURE THAT THE TRAVEL RANGES OF THE LANDING GEAR ARE CLEAR.
_______ R WARNING : INSTALL THE GROUND LOCK SLEEVE ON THE MLG ACTUATING CYLINDER
_______ R IMMEDIATELY AFTER YOU OPEN THE MLG DOOR.
(1)
Open the access panel 195BB(196BB).
(2)
Stand away from the travel-range of the MLG door.
(3)
Move the applicable MLG door control-handle to the OPEN position, as follows:
(a)
Remove the safety pin.
(b)
Push and hold-in the pushbutton and move the handle down.
(c)
Release the pushbutton to lock the handle in the OPEN position.
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