a380-Level i - Ata 36 Pneumatic

A380 TECHNICAL TRAINING MANUAL MANUAL MAINTENANCE COURSE - T1 & T2 (RR / Metric) LEVEL I - ATA 36 Pneumatic

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A380 TECHNICAL TRAINING MANUAL

LEVEL I - ATA 36 PNEUMATIC Pneumatic System Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Pneumatic Pneumatic Air Distribution Distribution System Presentation Presentation . . . . . . . . . . . . . . . . 4 Engine Bleed Air System Presentation Presentation . . . . . . . . . . . . . . . . . . . . . . . 10 OverHeat OverHeat Detection Detection System Presentation Presentation . . . . . . . . . . . . . . . . . . . . . 16 Pneumatic Pneumatic System Maintenance Maintenance (1) . . . . . . . . . . . . . . . . . . . . . . . . . 20

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TABLE OF CONTENTS

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PNEUMATIC SYSTEM INTRODUCTION General The Pneumatic system is composed of three sub-systems: - the Pneumatic Air Distri bution System (PADS), - the Engine Bleed Air System (EBAS), -the OverHeat Detection System (OHDS),

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PNEUMATIC SYSTEM INTRODUCTION

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PNEUMATIC PNEUMA TIC AIR DISTRIBUTION D ISTRIBUTION SYSTEM PRESENTA PRESENTATION TION Pneumatic Air Distribution System overview The Pneumatic Air Distribution System (PADS) collects compressed air from the various bleed air sources and supply it to the aircraft users. Air Sources The air sources are: - the four engines, - the APU and, - a ground air source via the three High Pressure Ground Connectors. Users The Users of the pneumatic system are: - the Air Conditioning System for hot air feed and unpressurized bay ventilation, - the Wing Anti-Ice System, - the Engine Starting System to g ive compressed air to the engine starters and, - the Hydraulic System for reservoir pressurization. PADS component s

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The main components of the PADS are: - the crossbleed manifold, - the three crossbleed valves (left, center and right,) - the APU isolation valve and, - the HP ground connectors. P 6 3 M L 0 T 0 T D 0 L 2 8 0 6 0 Y 0 L

MAINTENANCE COURSE - T1 & T2 (RR / Metric) LEVEL I - ATA 36 Pneumatic

PNEU PN EUMA MATI TIC C AIR AIR DIST DISTRI RIBU BUTI TION ON SYS SYSTE TEM M PRES PRESEN ENT TATI TION ON

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PNEUMATIC PNEUMA TIC AIR DISTRIBUTION D ISTRIBUTION SYSTEM PRESENTA PRESENTATION TION PADS Control and Indicating The PADS controls are located on the AIR PANEL PANEL (1225VM). These controls are: - the CROSSBLEED selector and, - the APU BLEED P/BSW. P/BSW. Indications concerning the PADS are displayed on the ECAM BLEED PAGE.

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PNEUMATIC PNEUMA TIC AIR DISTRIBUTION D ISTRIBUTION SYSTEM PRESENTA PRESENTATION TION Airflow coming from the APU is regulated and can be used directly by the users.

Crossbleed System All the air sources are connected to the crossbleed manifold. Three crossbleed valves are used to isolate the left hand and right hand bleed systems and also each engine bleed system when required. The APU and the HP ground connectors are connected to the left hand side of the crossbleed manifold.

System control The crossbleed valves control is done by a PADS application hosted in the four CPIOMs-A. The crossbleed selector located on the overhead panel is used to choose the control mode of the valves. Three modes are available: - the manual OPEN mode, to open the three crossbleed valves manually, - the manual CLOSE mode, to close the three valves manually and, - the AUTO mode, to use an automatic control of the valves by the four CPIOM-A. Note that in normal operation, the selector is on the AUTO position.

Ground Compressed air supply An alternative compressed air source is available when th e aircraft in on the ground. A ground air source can supply pressurized, temperature regulated and flow regulated air to the aircraft via three High Pressure Ground Connectors, located in at the bottom of the belly fairing. The HP Ground Connectors are connected to a common duct, connected onto the left hand side of the crossbleed manifold.

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APU Bleed system The APU bleed duct is connected to the left hand side of the crossbleed manifold. The APU isolation valve allows compressed air from the APU to go to the crossbleed manifold. 0

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When you need APU bleed air supply, press the APU BLEED pushbutton switch located on the AIR panel (1225VM). The signal is received by the 4 CPIOMs-A, which command the APU isolation valve to open. At the same time, the Electronic Control Box (ECB) opens the APU bleed valve. MAINTENANCE COURSE - T1 & T2 (RR / Metric) LEVEL I - ATA 36 Pneumatic

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ENGINE BLEED B LEED AIR SYSTEM PRESENTA PRESENTATION TION General Engine Bleed Air is the main compressed air source during flight. It supplies pressure and temperature regulated air to the Pneumatic Air Distribution System (PADS). (PADS). On each engine, air is bled from either an Intermediate Pressure (IP) port or a High Pressure (HP) port on the engine compressor. The engine bleed IP/HP selection system selects the appropriate bleed port according to engine operation parameters. Then, the engine bleed pressure control system regulates the bleed pressure according to the users bleed demand. Finally, the engine bleed temperature control system cools the bleed air using fan air.

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ENGINE BLEED B LEED AIR SYSTEM PRESENTA PRESENTATION TION Engine Bleed Control and Indicating The EBAS controls are located on the AIR panel (1225VM). These controls are the four ENGine BLEED pushbutton switches. Indications concerning the EBAS are displayed on the ECAM BLEED page.

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ENGINE BLEED B LEED AIR SYSTEM PRESENTA PRESENTATION TION Engine Bleed Functions Engine Bleed Air System is controlled automatically by the EBAS application hosted in the four CPIOMs-A. It is possible to switch off one or several engine bleed system(s) by releasing out the corresponding ENGine BLEED pushbutton switch.

Engine Bleed Port Selection Engine bleed port selection is achieved through the HP Bleed Valve and the IP Bleed Check Valve. Using Pressure sensors feedback, the EBAS application of the CPIOM-A opens or closes the HP Bleed valve depending on the Bleed demand and the pressure available at the IP port. Most of the time, air is bled from the IP port. The HP port is used when the engine is running at low-rating and the IP pressure is not sufficient to meet the user demand at such rate.

Engine Bleed Air Pressure Control

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The Bleed Valve and the Overpressure Valve (OPV) ensure eng ine bleed pressure control. Using Pressure sensors feedback, the EBAS application of the CPIOM-A modulates the Bleed Valve position in order to reach the user pressure demand. The OPV protects the system against overpressure in case of EBAS failure.

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The Fan Air Valve Valve (FAV) (FAV) ensures engine bleed temperature control. Using temperature sensor feedback, the EBAS application hosted in the CPIOMs-A modulates fan airflow through the pre-cooler heat exchanger to cool down the bleed air to the correct temperature. -

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OVERHEAT OVERHEA T DETECTION D ETECTION SYSTEM PRESENTA PRESENTATION TION System architecture architecture The OverHeat Detection System (OHDS) detection loops are located along the pneumatic system duct network and around some air conditioning system components. Each of the monitored area is equipped with dual detection loops (A loops and B loops). Dual detection loops are installed: - on each engine pylon, - on the wings bleed ducts, - on the inner wings bleed ducts, - in the left and right Air Generation Unit (AGU) bays, - on the upper and lower trim air ducts, - in the crossbleed valve area, - and on the APU bleed duct. Each detection loop is composed of sensin g elements connected in series.

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OVERHEAT OVERHEA T DETECTION D ETECTION SYSTEM PRESENTA PRESENTATION TION Loop Monitoring Two OverHeat Detection Units (OHDU) monitor the detection loops. They are located in the left and right avionics bay racks (2300VU and 2400 VU). If a leak is detected, the OHDU sends a signal to the CPIOM-A. Then, the OHDS application hosted in the CPIOM-A triggers appropriat e valve closure and sends a leak message to the Flight Warning System (FWS), to the Control and Display System (CDS) for indication and to the Onboard Maintenance System (OMS) for leak localization. If a leak is detected, fault lights illuminate on the corresponding BLEED pushbutton on the AIR panel (1225VM).

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PNEUMATIC SYSTEM MAINTENANCE (1) Pneumatic System safety items Here is an overview of main safety precautions relative to the pneumatic system. Make sure that the pneumatic system is depressurized before starting the work, pressurized air can cause unwanted pressurization of the aircraft, and injury to personnel. Parts can be hot for 1 hour after engine shutdown. Do not touch them until they are sufficiently cool.

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AIRBUS S.A.S. 31707 BLAGNAC cedex, FRANCE  STM  REFERENCE L0Y06082  MARCH 2006  PRINTED IN FRANCE  AIRBUS S.A.S. 2006  ALL RIGHTS RESERVED  AN EADS JOINT COMPANY  WITH BAE SYSTEMS