-
two limit switches, one for the closed position, the other for the 70 %
open position. These send a signal to the secondary computer. The ram-air inlet is closed with the actuator fully extended and open with the actuator fully retracted.
R **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399,
B. Ram Air Inlet Actuator
(Ref. Fig. 007)
The actuator for the ram air inlet consists of:
-
an actuator (nominal 100 mm stroke),
-
an AC motor,
-
a set of reduction gears,
-
a torque limiting clutch (230 daN +20 %),
-
two potentiometers, one for control through the pack controller 7HH (27HH) primary computer, the other for indication through the secondary computer,
-
two limit switches, one for the closed position, the other for the 70 %
open position. These send a signal to the secondary computer. The ram-air inlet is closed with the actuator fully extended and open with the actuator fully retracted.
R **ON A/C 401-499,
B. Ram Air Inlet Actuator
(Ref. Fig. 007A)
The actuator for the ram air inlet consists of:
-
an actuator (nominal 100 mm stroke),
-
an AC motor,
Ram-Air Door Actuator
Figure 007
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Ram-Air Door Actuator
Figure 007A
R 1EFF : 401-499, 1 21-61-00 Page 75
1 1 Aug 01/05
1 1
1CES 1
-
a set of reduction gears,
-
a torque limiting clutch (230 daN +20 %),
-
a hall sensor for contactless sensing of speed and direction, giving feedback to ACSC
-two end-of-travel limit switches, one for the closed position, the other for the 70 % open position. These send a signal to the secondary computer.
The ram-air inlet is closed with the actuator fully extended and open with the actuator fully retracted.
**ON A/C 001-003, 051-054,
C. Ram-Air Outlet Actuator (Ref. Fig. 007) The ram-air outlet actuator 9HH (29HH) is mechanically similar to the ram-air inlet actuator 8HH (28HH). The differences are; it has a smaller AC motor, the torque setting is reduced to 200 daN + 20 % and reversed operation. That is, the ram-air outlet is closed with the actuator fully retracted, and fully open with the actuator fully extended.
D. Bypass Valve (Ref. Fig. 008) The bypass valve 10HH (30HH) is a light alloy 2-inch butterfly valve. It is located in the duct downstream of the primary heat exchanger and splits the hot airflow between the ACM and a bypass (which goes to the turbine outlet). The bypass valve gets a signal from the pack controller 7HH (27HH) (primary and secondary computer) to modulate the hot airflow. This controls the water extractor outlet temperature, thus the pack outlet temperature. The bypass valve 10HH (30HH) consists of an actuator assembly and a valve body assembly. They are bolted together and internally connected. A butterfly valve on a central shaft is driven by a stepper motor through reduction gears which have mechanical end stops. Two cams (installed on the shaft) operate limit switches which signal fully open or fully closed positions to the pack controller 7HH (27HH) secondary computer. Two potentiometers (at the end of the shaft) signal the primary computer for indication and the secondary computer for BITE and indication. A manual override and visual position indicator device is installed on the bottom of the shaft.
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Bypass Valve 10HH, 30HH - Schematic
Figure 008
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R
R
R
**ON A/C 004-049, 055-099, 101-105, 151-158, 201-210,
D. Bypass Valve (Ref. Fig. 008A) The bypass valve 10HH (30HH) is a light alloy 2-inch butterfly valve. It is located in the duct downstream of the primary heat exchanger and splits the hot airflow between the ACM and a bypass (which goes to the turbine outlet). The bypass valve gets a signal from the pack controller 7HH (27HH) (primary and secondary computer) to modulate the hot airflow. This controls the water extractor outlet temperature, thus the pack outlet temperature. The bypass valve 10HH (30HH) consists of an actuator assembly and a valve body assembly. They are bolted together and internally connected. A butterfly valve on a central shaft is driven by a stepper motor through reduction gears which have mechanical end stops. Two cams (installed on the shaft) operate limit switches which signal fully open or fully closed positions to the pack controller 7HH (27HH) secondary computer. Step counting signals the primary and secondary computers for indication. The limit switches signal the secondary computer for BITE. A manual override and visual position indicator device is installed on the bottom of the shaft.
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