Aeronotique

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 SINGLE AISLE   TECHNICAL TRAINING MANUAL   MAINTENANCE COURSE - T1 & T2 (CFM56-5B/ME)   PNEUMATIC 

This document must be used for training purposes only

Under no circumstances should this document be used as a reference

It will not be updated.

All rights reserved No part of this manual may be reproduced in any form, by photostat, microfilm, retrieval system, or any other means,without the prior written permission of AIRBUS S.A.S.

SINGLE AISLE TECHNICAL TRAINING MANUAL

PNEUMATIC
Pneumatic Level 2 (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Engine Bleed System Description (3) . . . . . . . . . . . . . . . . . . . . . . . . 16 Pneumatic System Warnings (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 PneumaticSystem Operation (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 APU Bleed Air SPLY/X-Bleed System D/O (3) . . . . . . . . . . . . . . . . 36 BMC Interfaces (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Pneumatic Leak Detection System D/O (3) . . . . . . . . . . . . . . . . . . . . 42

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MAINTENANCE COURSE - T1 & T2(CFM56-5B/ME)  36 - PNEUMATIC

TABLE OF CONTENTS

May 11, 2006 Page 1

SINGLE AISLE TECHNICAL TRAINING MANUAL

PNEUMATIC LEVEL 2 (2)
SYSTEM OVERVIEW
The Pneumatic system is used to supply High Pressure (HP) air for air conditioning, pressurization, engine start and anti-icing. HP air can be supplied from both engines, the APU or an external ground source. However, APU BLEED air could also beused in flight, depending on altitude. The APU bleed supply is connected to the left side of the crossbleed duct. On the ground, a HP ground power unit can be connected to the left side pneumatic system. The right side may be supplied by opening the crossbleed valve.

ENGINE BLEED
The engine bleed air is pressure and temperature regulated prior to supplying the pneumatic system. Air is bled fromtwo engine High Pressure Compressor (HPC) stages, the Intermediate Pressure (IP) stage and the HP stage. The High Pressure Bleed Valve (HPV) supplies air to the system when the engines are at low power. Once the IP bleed is sufficient, the HPV closes. All the engine bleed air is supplied to the pneumatic system through the main engine BLEED valve (or Pressure Regulating Valve (PRV)), which acts asa shut off and overall system pressure regulating valve. Each Bleed Monitoring Computer (BMC) monitors system pressure and will shut down the engine bleed in case of excessive pressure. In addition, an Overpressure Valve (OPV) is installed downstream from the bleed valve to protect the system in case of overpressure. The temperature of the engine bleed air is regulated to a maximum value. The hotbleed air goes through an air-to-air heat exchanger called the precooler. Fan discharge air modulated by the Fan Air Valve (FAV), blows across the pre-cooler to maintain the temperature within limits.

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APU BLEED/EXTERNAL AIR
The left and right bleed systems are connected by a crossbleed duct. A crossbleed valve enables their interconnection or isolation.The APU can also be used for bleed air supply. This is usually done on the ground for air conditioning and for engine start.

MAINTENANCE COURSE - T1 & T2 (CFM56-5B/ME)  36 - PNEUMATIC

PNEUMATIC LEVEL 2 (2)

May 10, 2006 Page 2

SINGLE AISLE TECHNICAL TRAINING MANUAL

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SYSTEM OVERVIEW - ENGINE BLEED & APU BLEED/EXTERNAL AIR
MAINTENANCE COURSE -T1 & T2 (CFM56-5B/ME)  36 - PNEUMATIC PNEUMATIC LEVEL 2 (2) May 10, 2006 Page 3

SINGLE AISLE TECHNICAL TRAINING MANUAL

PNEUMATIC LEVEL 2 (2)
SYSTEM OVERVIEW (continued) LEAK DETECTION
Leak detection loops are installed along the hot air supply ducts of the pneumatic system and are connected to the BMCs. The leak detection system is organized into three loops. Here are the loops and the...
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