CPC Signal Interface Figure 008
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CPC Interface Inputs Figure 009
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CPC Interface Outputs Figure 010
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R **ON A/C 062-099, 106-149, 151-199, 204-299, 301-399, 401-499,
A. System Interfaces
(1) ADIRS - Interface
-------------------------------------------------------------------------------
Parameters/Label used by the CPC -------------------------------------------------------------------------------Baro Correction mbar BCD 234 745 - 1100 mbar Ambient Static Press (Corr.) BNR 246 100 - 1100 mbar Ambient Static Press (Uncorr.) BNR 245 100 - 1100 mbar True Airspeed BNR 210 60 -599 Kts
The selection of the ADIRU 1, 2 or 3 is in accordance with the subsequent matrix:
----------------------------------------------------------------------------| Selection of ADIRU 1, 2 or 3| | |----------------------------------------------------------------------------| | Priority | 1 | 2 | 3 | | System 1 | ADIRS 1 | ADIRS 2 | ADIRS 3 | | System 2 | ADIRS 2 | ADIRS 1 | ADIRS 3 | ----------------------------------------------------------------------------
B. FMGS - Interface The information from the FMGS is used to perform normal cabin pressure control. The CPCs use the FMGS parameters as follows:
-Destination QNH BCD 140 745 -1050 mbar
-Landing Elev. BNR 256 - 2048 to 16384ft
**ON A/C ALL
(1) FMGS-Parameter Application
(a)
Landing Altitude (Label 256) The landing altitude (destination input) is used to calculate the general descent control schedule of the cabin pressure control system. The landing altitude is also that altitude where, after flight and depressurisation the delta-P is zero.
(b)
Destination QNH (Label 140) The CPCS uses this input for calculating the actual pressure at the landing field from the LFE input. In case that the QNH is not available, the CPC uses the baro correction from the ADIRS. If the baro correction from the ADIRS is also not available, the correction is set to the default value of 1013.25 mbar.
C. LGCIU Interface The LGCIU 1 (5GA1) and LGCIU 2 (5GA2) give a discrete signal for the flight/ground status to the CPCs. This signal is used to switch the CPC modes.
D. EIU Interface The EIU 1 (1KS1) and EIU 2 (1KS2) give a discrete signal for the throttle lever position to the CPCs. This signal is also used to switch the CPC modes.
E. CFDS Interface The BITE in the CPCs and the outflow valve actuator drive electronics, can isolate faults down to component level. This information is given to the CFDIU (1TW) via an ARINC 429 data bus.
F. Explanations to the Parameter List The parameter list is organized according to the connected ARINC 429 data buses. The connected systems (e.g. FAC, ECU, EEC, etc.) and the corresponding ATA chapter numbers are stated in the header on the left side of each page of the parameter lists. The columns are described as follows:
----------------------------------------------------------------Column | Description ----------------|-----------------------------------------------
1st | EQ.SYS.LAB.SDI = Parameternumber
SYS.LAB.SDI |
| System number: According to the system which is
| sending out the corresponding parameter:
| 1 for system one
| 2 for system two
| 3 for system three
| Label of the parameter, octal value
| according to ARINC 429.
| SDI states the Source/Destination Identifier
| which is used by the system for the
| corresponding parameter:
| 00 means SDI 00 (0)
| 01 means SDI 01 (1)
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Column | Description
----------------|-----------------------------------------------| 10 means SDI 10 (2) | 11 means SDI 11 (3)
---------------|------------------------------------------------2nd | PARAMETER PARAMETER | Parameter name ---------------|------------------------------------------------3rd | RANGE
RANGE | | Three different types of ranges are shown in | this column: | The first one, indicated by a 'W' (WORDRANGE), | is related to the ARINC 429 data bus. This | shows the maximum value of the parameter that | can be transferred on the bus. This | depends on the number of data bits (see | column DATA BITS) and the resolution ('R') of | the parameter (see column ACCURACY). | The second one, with no specific indication, | shows the normal operational range of the | parameter. | The third one is related to the ARINC 429 | Discrete Data Words. There are two states: | 'bit status 0' or 'bit status 1'. They | indicate the true condition of the | corresponding data word bit position.
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