Door Hydraulic System - Component Location at the FWD Cargo Comartment Door
Figure 001
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Door Hydraulic System - Component Location at the AFT Cargo Compartment Door
Figure 002
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R Door Hydraulic System - Component Location at the Yellow Ground Service Panel
Figure 003
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R Door Hydraulic System - Component Location at the Yellow Ground Service Panel
R Figure 003A
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R Door Hydraulic System - Component Location at the Yellow Ground Service Panel
R Figure 003B
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R Door Hydraulic System - Component Location at the Center Fuselage R Figure 004
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FIN I I FUNCTIONAL DESIGNATION I PANELIZONEIACCESS I I I I DOOR I ATA
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R 3188GM 3717GM CHECK VALVE DOUBLE CHECK VALVE 198 150 29-16-00 52-36-13
R R R R 3. System Description__________________ (Ref. Fig. 005) The door hydraulic system supplies the duplex door actuators with hydraulic power. The door actuators extend to open the cargo doors to the outer side. It is possible to open the FWD and AFT cargo door at the same time.
The electric pump of the Yellow hydraulic system supplies the door hydraulic system with hydraulic power. If this hydraulic power is not available, it is possible to pressurize the door hydraulic system with the hand pump. The normal system pressure of the door hydraulic system is 3000 psi (206 bar).
The electrical control system of the cargo doors supplies the hydraulic components with electrical power. It prevents the operation of the door hydraulic system when the cargo doors are locked.
The restrictors of the door actuators and the manual selector valves control the speed of the cargo doors.
INTENTIONALLY BLANK
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R Schematic of the Door Control System Figure 005 (SHEET 1)
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R Schematic of the Door Control System Figure 005 (SHEET 2)
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R R 4. Component Description_____________________ (Ref. Fig. 002)
R **ON A/C 001-049, 051-099, 101-149, 201-299,
R (Ref. Fig. 003)
R **ON A/C 151-199, 401-499,
R (Ref. Fig. 003A)
R **ON A/C 301-399,
R (Ref. Fig. 003B)
R **ON A/C ALL
R R (Ref. Fig. 004, 006)
NOTE : The identification numbers in brackets are for the components of the____ AFT cargo door.
To operate the FWD (AFT) cargo door, a control panel is installed on the fuselage. To get access to the control panel, open the access panel 134AR (154AR). On the control panel there is a selector to operate the manual selector valve 2501MJ (2504MJ) and a green indicator light 9MJ (8MJ). The indicator light comes on when the door actuators 2502MJ and 2503MJ (2505MJ and 2506MJ) are in their extended, locked positions. The selector is spring-loaded to the neutral position. When you release it in the "Open" or "Closed" position, it moves back to the neutral position. The manual selector valve 2501MJ (2504MJ) is installed behind the control panel and controls the operation of the cargo door. This valve has an extension mode, a neutral mode, an interim mode and a retraction mode.
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