R **ON A/C 106-149, 303-399, 401-499,
R 6HL VALVE-SAFETY 1 R 7HL VALVE-SAFETY 2 R 9HL CONTROL UNIT-RESIDUAL PRESSURE R 10HL VALVE-OUTFLOW R 11HL CONTROLLER-CABIN PRESSURE 1 R 12HL CONTROLLER-CABIN PRESSURE 2 R 20HL SEL-CABIN PRESS/LDG ELEV AUTO
262 312AR 21-31-52262 312AR 21-31-52162DW 172 826 21-31-5195VU 121 811 21-31-3496VU 122 811 21-31-3425VU 210 21-31-00
262 312AR 21-31-52 262 312AR 21-31-52 122 811 21-31-35 162DW 172 826 21-31-51 95VU 121 811 21-31-34 96VU 122 811 21-31-34 25VU 210 21-31-00

 Pressure Control System - Component Location Figure 001 (SHEET 1)
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 21-31-00Page 2 1201-299, 301-302, 1Aug 01/05 1 1 1CES 1

 Pressure Control System - Component Location Figure 001 (SHEET 2)
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 21-31-00Page 3 1201-299, 301-302, 1Aug 01/05 1 1 1CES 1R Pressure Control System - Component Location R Figure 001A (SHEET 1)

R 1EFF : 106-149, 303-399, 401-499, 1 21-31-00Page 4 1 1 Aug 01/05 1 1 1CES 1R Pressure Control System - Component Location R Figure 001A (SHEET 2)

R 1EFF : 106-149, 303-399, 401-499, 1 21-31-00Page 5 1 1 Aug 01/05 1 1 1CES 1R Pressure Control System - Component Location R Figure 001A (SHEET 3)

R 1EFF : 106-149, 303-399, 401-499, 1 21-31-00Page 6 1 1 Aug 01/05 1 1 1CES 1

R  **ON A/C ALL
 3. System Description__________________ 
R  **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
 (Ref. Fig. 001) 
R  **ON A/C 106-149, 303-399, 401-499, 
R  (Ref. Fig. 001A) 
R  **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299, 301-302,
 A. The Pressure Control and Monitoring System The system has two identical, independent, automatic systems. Each system has a Cabin Pressure Controller (CPC) 11HL (12HL) which controls the pressure through a flap-type outflow valve 10HL. This valve is installed in the lower right-hand fuselage skin behind the aft cargo compartment. In the automatic operation the CPCs use the data from the Flight Management and Guidance System (FMGS) and the Air Inertial/Reference System (ADIRS). The active CPC sends control signals through a RS422 bus to the outflow valve. The electronic box, the auto-motor and a gearbox operate the outflow valve flap in the commanded position. The feedback module gives the position signals to the CPCs via the electronic box for control purposes and indication on the Electronic Instrumentation System (EIS).
 Only one CPC operates its system at a time, with the other system on standby. The change of control from one CPC to the other is fully automatic after each flight, on landing with a time delay of 70 sec. The systems will also change if there is a failure or part failure of one of the control systems. A landing field elevation (LDG ELEV) selector 20HL is installed on the CABIN PRESS overhead panel 25VU. Under normal condition the LDG ELEV selector is selected in the AUTO position. Then the CPCs 11HL (12HL) use the landing field elevation data from the FMGS. In all other cases the LDG ELEV selector signal overrides the FMGS data (semi-automatic operation).
 The MAN V/S toggle switch 5HL controls the manual motor of the outflow valve 10HL when the MAN SEL pushbutton switch 14HL is selected to MAN.

 These controls are installed in the cockpit, on the CABIN PRESS overhead
 panel 25VU.
 NOTE : The MAN mode can be selected more than two times in a single____
 flight. After each re-selection of AUTO-mode the CPC, which was
 previously in in standby state changes to operational state.
 In manual mode the backup channel of the CPC in position No. 1 is used.
 It has a pressure sensor to generate the excess cabin altitude warning
 and pressure outputs for the indication on the EIS.
 A DITCHING pushbutton switch 13HL (guarded black) closes the outflow
 valve in ditching configuration.
 Two safety valves 6HL (7HL) prevent excessive positive and negative
 differential pressure in the cabin. These valves are installed in the aft
 pressure-bulkhead above the aircraft flotation line. 
R  **ON A/C 106-149, 303-399, 401-499, 
R  A landing field elevation (LDG ELEV) selector 20HL is installed on the 
R  CABIN PRESS overhead panel 25VU. Under normal condition the LDG ELEV 
R  selector is selected in the AUTO position. Then the CPCs 11HL (12HL) use 
R  the landing field elevation data from the FMGS. 
R  In all other cases the LDG ELEV selector signal overrides the FMGS data 
　
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