*
LANDING.
Either ASCPC can give the flight phase information; the left is the primary source.
If any information is not available, the indication is blank.
Training Information Point
The related ASCPC calculates valve position information for the PRSOV and the HPSOV. Actual valve position does not always agree with the position shown. If you must make sure that the PRSOV or the HPSOV is open or closed, do a check of the position indicator on the valve.
The positions of the isolation valves and the APUSOV, are usually based on actual valve position measured by RVDTs. If a RVDT fails, the related valve position is calculated by the related ASCPC.
If an ASCPC has a failed primary control, then all information that normally comes from that controller will not show. The left ASCPC gives indications for the left part of the pneumatic system plus the center isolation valve. The right ASCPC gives indications for the right part of the pneumatic system plus the APU isolation valve (APUSOV).
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PNEUMATIC -SYSTEM TESTS
General
These are the pneumatic system tests that show when you select ATA 36 Air Supply System:
*
Left air supply control system
*
Right air supply control system.
Left and Right Air Supply Control System
These tests make sure that the electrical circuits for these air supply control system LRUs operate correctly:
*
Valves
*
Controllers
*
Interfaces.
You must remove pressure in the pneumatic ducts for this test. During the test, the torque motors and solenoids move. The tests each take less than 1 minute.
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
ENGINE AIR SUPPLY -INTRODUCTION
General
The engine air supply system supplies regulated bleed air to the air supply distribution system.
The engine air supply uses bleed air from an intermediate stage and a high stage of the high pressure compressor. The air supply cabin pressure controllers (ASCPC) control the bleed air to regulate flow, temperature, and pressure.
These are the air user systems:
*
Engine starter
*
APU starter
*
Wing anti-ice
*
Hydraulic reservoir
*
Air conditioning pack
*
Total air temperature (TAT) probe
*
Potable water
*
Aft and bulk cargo heat
*
Air driven pump.
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ENGINE AIR SUPPLY -GENERAL DESCRIPTION
General Description
The engine air supply system has three levels of control:
*
Digital (primary mode)
*
Analog (backup mode)
*
Pneumatic.
The ASCPC supplies the primary and backup modes. The high pressure fan air controller (HPFAC) and the pressure regulating and shutoff valve controller (PRSOVC) are set to let the engine air supply system operate without ASCPC control. This is the pneumatic mode.
For usual operation, all functions that have a relation to the primary mode and some functions for the backup mode operate at the same time. The primary mode and backup modes work together to supply the most efficient control for the engine air supply system.
If the primary mode fails, all functions for the backup and the pneumatic modes operate together. The backup and the pneumatic modes give a limited amount of control, protection, and indications for the engine air supply system.
If the primary and backup modes fail, the pneumatic mode sets the engine air supply system to the default condition. In the default condition, the engine air supply system supplies air in the pneumatic mode with no protection or indications.
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