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 C. Door Bypass Valve (Ref. 32-31-00) 
R  **ON A/C 301-399, 
R  (Ref. Fig. 005) 
R  **ON A/C ALL
 The door bypass valve is installed in the close line of each MLG door actuating-cylinder. During the operation of the Normal Extension and Retraction System (Ref. 32-31-00), hydraulic fluid goes through the door bypass valve.
 When the ground door-opening mechanisn is operated, the door bypass valve: - closes the hydraulic supply pressure - connects each side of the door actuating-cylinder together.
 This prevents a hydraulic lock, and allows the hydraulic fluid to be released from under the door actuating-cylinder piston. The door then moves under gravity.
 D. Proximity Sensors 
R  (Ref. Fig. 006)
 Proximity sensors and targets (Ref. 32-31-00) are used to show the position of the main door. The proximity sensors are installed on the center-fuselage keel-structure. The targets are installed on the main door, on a bracket at the door hinge line.

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R  MLG Door - Proximity Sensor and Target Figure 006
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 During the operation of the door, the positions of the proximity sensors change in relation to their targets. The sensors send a signal to the Landing Gear Control and Interface Units (LGCIUs) (Ref. 32-31-00). This signal shows when the door is 'fully open' or 'not fully open'. This data is used to: - control the retraction and extension sequences of the landing gear - supply indication/failure data of the MLG doors, to the indication and warning system in the flight compartment.
 4. Power Supply____________
 Not applicable
 5. Interface_________ 
R  (Ref. Fig. 007)
 The systems that follow, interface with the main landing gear doors: - normal extension and retraction (Ref. 32-31-00) - main landing gear (Ref. 32-11-00) - main landing gear doors (Ref. 52-81-00).
 6. Component Description_____________________
 A. General 
R  **ON A/C 301-399, 
R  (Ref. Fig. 008) 
R  **ON A/C ALL
 The MLG doors are made from Carbon-Fibre Reinforced-Plastic (CFRP) with a NOMEX honeycombe core. A detailed description of the MLG doors is given in (Ref. 52-81-00).
 Each door has flexible seals at its structure interface which protect the CFRP/metal interfaces from damage by the airflow.

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R  MLG - Interface Figure 007
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R  MLG - Main Door 
R  Figure 008
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 B. Main Door
 The shape of the door agrees with the contour of the fuselage and has hinges at its inboard edge. The MLG door actuating-cylinder ram end is attached to the main door, at an attachment fitting on the forward edge. There are three access steps on the door, and ramps at the front and rear (two fixed and one adjustable). An uplock roller is attached to the forward, outboard end.
 C. Fixed Fairing 
R  **ON A/C 301-399, 
R  (Ref. Fig. 009) 
R  **ON A/C ALL
 The fixed fairing has five adjustable attachments, for installation to the main gear.
 D. Hinged Fairing 
R  **ON A/C 301-399, 
R  (Ref. Fig. 010) 
R  **ON A/C ALL
 The hinged fairing has one hinge and an attachment point for the MLG attachment rod.
 E. Ground Door-Opening Handle 
R  **ON A/C 301-399, 
R  (Ref. Fig. 005)

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R  MLG - Fixed Fairing 
R  Figure 009
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R  MLG - Hinged Fairing 
R  Figure 010
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R **ON A/C ALL

 The ground door-opening handle is a lever with a forked end that is attached to the structure. A teleflex cable attaches to the apex of the fork. A release plunger at the hand grip releases a self latching mechanism (which operates to hold the handle in the open or the closed position). A locking pin prevents accidental operation of the handle.
　
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