4. Install Flexible Coupling Assembly
A. Align duct per tolerances in figure 401.
B. Install retainer.
C. Slide sleeve and ring over retainer.
D. Position sleeve to encircle both ring and retainer.
E. Install clamp and tighten nut to 90 to 95 pound-inches.
Flexible Coupling Assembly 500
21-51-61 Figure 401 (Sheet 1) May 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Flexible Coupling Assembly
May 15/67 Figure 401 (Sheet 2) 21-51-61
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
RAM AIR SYSTEM - DESCRIPTION AND OPERATION
1. General
A. The ram air system provides for two different methods of operation. During pressurized flight, ram air is used as a cooling medium for the air cycle system heat exchangers. An air cycle system utilizes a turbofan to induce airflow through the same ducts for ground operation and during flight when flaps are in any position other than retracted. A ram air system is included for each air cycle system. (See figure 1)
B. The ram air system provides a cooling medium for the air-to-air primary and secondary heat exchangers. The heat exchangers are located so that air passing through the ram air ducts must pass through the heat exchangers. A turbofan is installed between duct sections near the aft end of the ram air system.
C. A ram air modulation system automatically regulates airflow through the ram air system during flight to minimize drag. The system also moves to provide maximum flow for ground operation and extends a deflector door to prevent slush injection when the airplane is moving on the ground.
D. The ram air modulation system equipment includes the ram air inlet modulation panel, a deflector door, ram air exhaust louvers and their operation mechanism, a ram air actuator, a cable system for the ram air inlet modulation panel, a ram air control, and a ram air temperature sensor. (See figure 2). Air cycle system equipment includes a turbofan, a turbofan valve, and the related ducting for routing pressurized air to run the turbofan.
2. Ram Air Inlet
A. The ram air inlet consists of a scoop, a modulation panel, and a deflector door. A scoop is located on each side of the airplane at the forward end of the wing to body fairing. The scoop forms the entry for the ram air ducts.
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Aug 15/67 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-52-0 Page 1
B. The ram air inlet modulation panel is made up of two panel sections. The forward end of the forward panel is hinged to structure and its aft end is hinged to the forward end of the aft panel section. The aft end of the aft panel section is equipped with rollers, which allow movement forward and aft. Two cranks with rollers attached move the forward end of the aft panel inboard or outboard to open or close the inlet. The cranks are attached to a shaft, which is operated by the ram air actuator through a cable system.
C. The deflector door is hinged at its forward edge to airplane structure and is shaped to fit in the scoop when retracted to prevent interference with ram airflow into the ram air ducts. A mechanism connected to the modulation panel cable system causes the deflector door to be extended when the airplane is on the ground and then to fair on takeoff. The deflector door minimizes the possibility of foreign material entering the ram air system when the airplane is moving on the ground.
3. Ram Air Ducts
A. The ram air ducts are contained in the ram air duct cavity and the equipment bay. A web between the two compartments helps support the heat exchangers and the inlet ducts. The ram air exits ducts connect to the inboard side of the heat exchangers then extend to an outlet just aft of the equipment bay doors. A turbofan is included between duct sections immediately forward of the outlet. Access to the entire ram air duct system is obtained by opening the ram air duct access door and the air conditioning equipment bay doors.
4. Ram Air Actuator
A. The ram air actuator is a 115-volt ac motor-operated linear actuator. It operates in either direction and may be stopped at any position between full extend and full retract. The actuator is used to modulate the ram air inlet modulation panel and the ram air exhaust louvers, and moves the deflector door.
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