R **ON A/C 062-099, 106-149, 153-199, 205-299, 301-399,
 (Ref. Fig. 010A)

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 The trim-air valve 11HK (12HK, 13HK) consists of an actuator assembly and a valve body assembly. They are bolted together and internally connected. A butterfly valve is driven by a stepper motor through reduction gears which have mechanical end stops. A cam installed on the shaft, operates a limit switch which signals fully closed to the zone controller 8HK. Step counting will signal the zone controller main and secondary computers the valve position. The zone controller uses this information for BITE and ECAM display. A manual override and visual position indicator device is installed on the bottom of the shaft.
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 Trim Air Valve (11HK, 12HK, 13HK)
 Figure 010

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 Trim Air Valve (11HK, 12HK, 13HK)
 Figure 010A

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 C. Zone Temperature Sensor (Ref. Fig. 011) There are three zone-temperature sensors 21HK (22HK, 23HK) one installed in the cockpit, fwd cabin and aft cabin zones. Each sensor consists of a ventilated plastic body into which are potted two thermistors. One thermistor supplies the zone controller 8HK primary computer the other the secondary computer, each performs control and indication. Also incorporated is a 6-pin connector.
 D. Duct Temperature Sensor (Ref. Fig. 012) There are three duct-temperature sensors 15HK (16HK, 17HK), one installed in the main supply ducts to the cockpit, fwd cabin and aft cabin zones. Each sensor consists of a ventilated metal body into which are potted two thermistors. One thermistor supplies the primary computer (of the zone controller 8HK), the other supplies the secondary computer (of the same controller). Each gives control indication and overheat detection. Also incorporated is a 6-pin electrical connector.
 E. Mixer Temperature Sensor (Ref. Fig. 013) There are two mixer temperature sensors 24HK (25HK) one installed on each side of the mixer. Each consists of a ventilated metal body into which are potted two thermistors. One thermistor supplies the primary computer (of the zone controller 8HK) the other the secondary computer. Also incorporated is a 6-pin electrical connector.
 F. Zone Temperature Selector (Ref. Fig. 014) There are three zone-temperature selectors 27HK (28HK, 29HK) installed on the AIR COND panel 30VU in the cockpit overhead panel. One selector for the cockpit, fwd cabin and aft cabin zones. Each one consists of a rotary setting potentiometer in a tubular metal housing. The temperature range is between 18 DEG.C (64.40 DEG.F) and 30 DEG.C (86.00 DEG.F) when in the 12 o'clock position the temperature is approx.24 DEG.C (75.20 DEG.F). Each selector is connected to the primary computer (of the zone controller 8HK) for temperature control function. An electrical connector is mounted on the base of the selector.
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 Zone Temperature Sensor (21HK, 22HK, 23HK) Figure 011
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 Duct Temperature Sensor (15HK, 16HK, 17HK) Figure 012 
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 Mixer Temperature Sensor (24HK, 25HK) Figure 013 
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 Zone Temperature Selector (27HK, 28HK, 29HK) Figure 014
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 G. Trim-Air Pressure Regulating-Valve (Ref. Fig. 015) The trim-air pressure regulating-valve 14HK regulates the pressure of the air supplied to the trim-air valves 11HK (12HK, 13HK). It performs the system shut-off function. The valve is a three-inch steel-butterfly type which is pneumatically actuated, and electrically signalled. The function of the valve is to act as an ON/OFF valve for the trim-air system. It also regulates the downstream pressure to a nominal 280 mbar above cabin pressure. A safety function is also included to reduce downstream pressure by about 50 % when any duct temperature goes above 80 DEG.C
 (176.00 DEG.F) The pressure regulation is controlled pneumatically and two solenoids control the ON/OFF function and the safety function. A limit switch indicates CLOSED/NOT CLOSED to the zone controller (8HK) and the ECAM system.

R **ON A/C 401-499,
　
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