**ON A/C ALL
 Pack Temperature Control Parameter List Remarks:
 R = Resolution W = Wordrange
 (I)= Significant Data Digits

R **ON A/C 001-003, 051-054,
 Alpha Call-up List
 | ALPHA | PARAMETER | NAME | | CALL UP | NUMBER | | |----------------------------------------------------------------------------| | PSW1 | 8E.1.062.11| Discrete Data Word | | | 8E.2.062.00| | | | | | | TW | 8E.1.111.11| Pack Water Extr. Temperature Deg C | | | 8E.2.111.00| | | | | | | PBV | 8E.1.112.11| Pack Bypass Valve Position % | | | 8E.2.112.00| | | | | | | TP | 8E.1.121.11| Pack Outlet Temperature Deg C |

 | ALPHA | PARAMETER | NAME |
 | CALL UP | NUMBER | |
 |----------------------------------------------------------------------------|

 |  |  8E.2.121.00|  |
 |  |  |  |
 |  COT  |  8E.1.123.11|  Pack Compr. Outlet Temp.  Deg C |
 |  |  8E.2.123.00|  |
 |  |  |  |
 |  RO  |  8E.1.124.11|  Pack Ram Air Outlet Position  %  |
 |  |  8E.2.124.00|  |
 |  |  |  |
 |  PF  |  8E.1.126.11|  Pack Flow Demand  kg/sec|
 |  |  8E.2.126.00|  |
 |  |  |  |
 |  |  8E.1.127.11|  Pack Flow Measured  kg/sec|
 |  |  8E.2.127.00|  |
 |  |  |  |
 |  RI  |  8E.1.130.11|  Pack Ram Air Inlet Position  %  |
 |  |  8E.2.130.00|  |

 |----------------------------------------------------------------------------|

R **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 Alpha Call-up List
 | ALPHA | PARAMETER | NAME | | CALL UP | NUMBER | | |----------------------------------------------------------------------------| | PSW1 | 8E.1.062.11| Discrete Data Word | | | 8E.2.062.00| | | | | | | TW | 8E.1.111.11| Pack Water Extr. Temperature Deg C | | | 8E.2.111.00| | | | | | | PBV | 8E.1.112.11| Pack Bypass Valve Position % | | | 8E.2.112.00| | | | | | | TP | 8E.1.121.11| Pack Outlet Temperature Deg C | | | 8E.2.121.00| | | | | | | COT | 8E.1.123.11| Pack Compr. Outlet Temp. Deg C | | | 8E.2.123.00| | | | | | | PF | 8E.1.126.11| Pack Flow Demand kg/sec| | | 8E.2.126.00| | | | | | | ALPHA | PARAMETER | NAME | | CALL UP | NUMBER | | |----------------------------------------------------------------------------| | | 8E.1.127.11| Pack Flow Measured kg/sec| | | 8E.2.127.00| | | | | | | RI | 8E.1.130.11| Pack Ram Air Inlet Position % | | | 8E.2.130.00| | |----------------------------------------------------------------------------|

 **ON A/C ALL
 6. Component Description
_____________________

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 A. Pack Controller
 (Ref. Fig. 006)

 (1)
 General The pack controller 7HH (27HH) is an electronic assembly of modular construction, mounted on a chassis with a metal cover (4MCU to ARINC 600). There are two identical pack controllers, one for each air conditioning pack 10HM (11HM). Each controller consists of a primary computer and an electrically independent secondary computer. The secondary computer serves as a back-up in the event of a primary computer failure. The primary computer can still control in the event of a partial failure, but at a reduced level.

 (2)
 Functions The functions of the pack controllers 7HH (27HH) are as follows:

 -
the control of the water-extractor outlet temperature in accordance with demands elaborated from the zone controller 8HK. 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),

 -
the setting of the optimized flow demand reference computed and sent from the zone controller 8HK. This setting is realized through varying the section of an internal discharge nozzle of the flow control valve 8HB (11HB),

 -
the overheat detection and automatic safety control,

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

 Pack Controllers - Location
 Figure 006

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 21-61-00Page 70 1201-299, 301-399, 1Aug 01/05 1 1 1CES 1

 -
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,
　
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