-
the simplification of ground maintenance through a ground BITE test based on the CFDS,

 -
the storage of failure data in a non-volatile random access memory. The pack controller 7HH (27HH) functions are split between the primary computer and the secondary computer as shown below:

 -------------------------------------------------------------------------------FUNCTION PRIMARY SECONDARY -------------------------------------------------------------------------------Flow setting modulation Yes No Pack temp. control from zone controller demand Yes Yes Bypass valve control Yes Yes Ram air flow modulation Yes No Overheat detection and indication Yes Yes Pack temp. control to 15 DEG.C (59 DEG.F) ref. No Yes Failure analysis Yes Yes BITE and info. transmission to zone controller Yes No ECAM indications No Yes Anti-ice valve control Yes Yes Data handling Yes Yes
 (3) Compressor Outlet Overheat-Detection and Signals The pack controller 7HH (27HH) primary or secondary computer can detect an overheat 260 DEG.C (500.00 DEG.F) at the air-cycle machine 10HM (11HM) compressor outlet. The primary through the compressor discharge temp. sensor 12HH (32HH), and the secondary through the compressor overheat sensor 15HH (35HH). The first will send a signal to light up the FAULT legend on the related pack pushbutton switch 7HB (6HB) (installed on panel 30VU in the cockpit overhead panel). At this point, the crew must select the pack OFF manually, as the pack controller takes no automatic actions. An overheat signal is also sent on the fourth occurrence (during one flight leg), of a temperature over 230 DEG.C (446.00 DEG.F).
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 A. Air Conditioning System Controller (ACSC)
 (1)
 General The Air Conditioning System Controller (ACSC) 47HH (57HH) is an electronic assembly of modular construction, mounted on a chassis with a metal cover (4MCU to ARINC 600). There are two identical ACSC's, one for each air conditioning pack 10HM (11HM). Each ACSC has two fully independent lanes.

 (2)
 Functions The functions of the ACSC 47HH (57HH) are as follows:

 -the control of the water-extractor outlet temperature. This control is done through the modulation of the bypass valve 10HH (30HH) and the ram-air doors. The way this is done is combined and optimized to meet the demanded temperature with lowest use of ram-air (reduced drag penalties),
 -
to set the optimized flow demand reference. This setting is realized through varying the section of an internal discharge nozzle of the flow control valve 23HB (24HB),

 -
to compute and deliver a pack temperature demand signal for the pack

 -
to maintain constant temperatures at a preselected value in the

 cockpit, FWD cabin and AFT cabin zones - overheat detection and automatic safety control,

 -
to compute and deliver an engine rpm modulation to FADEC in order to get the necessary bleed pressure

 -
to give the FADEC a bleed air valve status

 -
the calibration, coding and delivery of information for ECAM display,

 -
the reduction of crew work load through the elimination of manual control. The system detects its own failures and takes the necessary action to overcome these detected failures automatically,

 -
the simplification of ground maintenance through a ground BITE test based on the CFDS,

 -
the storage of failure data in a non-volatile random access memory.

 (3)
 Compressor Outlet Overheat-Detection and Signals The ACSC 47HH (57HH) can detect an overheat 260 DEG.C (500.00 DEG.F) at the air-cycle machine 10HM (11HM) compressor outlet. THe ACSC active lane will send a signal to light up the FAULT legend on the related pack pushbutton switch 7HB (6HB) (installed on panel 30VU in the cockpit overhead panel). At this point, the crew must select the pack OFF manually, as the pack controller takes no automatic action.

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 **ON A/C 001-003, 051-054,

 B. Ram Air Inlet Actuator (Ref. Fig. 007) The ram-air inlet actuator 8HH (28HH) for each pack can be modulated only together with the ram-air outlet actuator 9HH (29HH) (to get optimum pack cooling airflow). 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,