(c)  
Trim valve position, and zone, target and duct temperatures are received by the EIU on an ARINC 429 data bus from the Zone Temperature Controller (ZTC).

 (d)  
Pack outlet temperature, pack flow, turbine bypass valve, ram air inlet, ram air exit, and compressor outlet data is received by the EIU on an ARINC 429 data bus from the Pack Temperature Controller (PTC).

 (2)  
Zone Temperature

 (a)  Actual zone temperatures are displayed by white colored digital readouts in units of °C (Celsius).

 (3)  
Target Temperature

 (a)  Selected zone temperatures are displayed by white colored digital readouts in units of °C (Celsius).

 (4)  
Duct Temperature

 (a)  Duct temperatures are displayed by white colored digital readouts in units of °C (Celsius).

 (5)  
Trim Valve Position

 (a)  Trim valve position is displayed by white colored digital readouts. Full open valve position is indicated by 1.00 and full closed by 0.00.
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 (6)  
Trim Air Pressure

 (a)  Displayed in units of psi.

 (7)  
Pack Outlet Temperature

 (a)  Displayed in units of °C (Celsius).

 (8)  
Pack Flow

 (a)  Displayed in units of cubic meters per minute.

 (9)  
Turbine Bypass Valve (TBV) Position

 (a) Full open position is indicated by 1.00 and full closed by
 0.00.

 (10)
 Ram Air Inlet (RAI) Door Position

 (a) Full closed position is indicated by 1.00 and full open by
 0.00.

 (11)
 Ram Air Exit (RAE) Door Position

 (a) Full closed position is indicated by 1.00 and full open by
 0.00.

 (12)
 Compressor Outlet Temperature

 (a)  Displayed in units of °C (Celsius).

 (13)
 PTC Channel In Control

 (a)  
The pack temperature controller (PTC) channel in control is indicated by the message A (PTC A controlling packs 1-3) or B (PTC B controlling packs 1-3).

 (b)  
The indicator will blank for a no channel in control condition.

 E.  EICAS ECS (Air Supply and Cabin Pressure System) Maintenance Display (Fig. 52)
 (1)  General
 (a)  
ECS (Environmental Control System) parameters for high pressure controller, high pressure valve, pressure regulating valve, engine duct pressure, precooler outlet temperature, fan air valve, starter valve, pressure regulating shutoff valve, manifold duct pressure, cabin altitude, rate, differential pressure, landing altitude, outflow valve position and CPC in control are presented for display.

 (b)  
Manifold duct pressure data is received by the EIU on an ARINC 429 data bus from the Zone Temperature Controller (ZTC).

 (c)  
Cabin altitude and cabin rate are calculated by the EIU based on a cabin pressure signal received from the Cabin Pressure Controller System (CPCS). A backup analog cabin pressure signal is received by the EIU for the cabin altitude and rate calculations in case of a CPCS failure.

 (d)  
Differential pressure is calculated by the EIU using cabin pressure and an ambient pressure signal received on an ARINC 429 data bus from the Air Data Computer (ADC).

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MAINTENANCE MANUAL

ECS
ENGINE DUCT
PRESSURE

AIR SUPPLY SYSTEM: 1234
PRECOOLER
ENG DUCT PRESSURE 38 38 38 38
OUTLET
TEMPERATURE

PRECOOLER OUT TEMP 200 200 200 200

LR MANIFOLD DUCT PRESSURE 38 38
MANIFOLD DUCT PRESSURE

CABIN RATE CABIN
CABIN PRESSURE SYSTEM:
ALTITUDE
　
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