EGYPTAIR TRAINING CENTER

• PNEUMATIC SYSTEM FOR ENGINEERS

• By:• Engineer / AHMED MOKHTAR

PNEUMATIC SYSTEM

• INTRODUCTION

• a/c needs compressed air…why?

water

Compressed air

hydraulic

Compressed air

Hydraulic tank Water tank

PNEUMATIC SYSTEM

• INTRODUCTION

• a/c needs compressed air…why?

Wing

L.E

Hot air tube

Hot air

PNEUMATIC SYSTEM

• INTRODUCTION

• a/c needs compressed air…why?

Air cond. Unit ( pack)Hot air Cold air

PNEUMATIC SYSTEM

• INTRODUCTION

• a/c needs compressed air…why?

Engine Air StarterHot air

Main gear boxMech I/P

USERS OF COMPRESSED AIR

• - HYDRAULIC RESERVOIR PRESSURIZATION

• - WATER TANK PRESSURIZATION

• - WING ANTI- ICE ( WAI)

• AIR CONDITIONING UNITS ( PACKS)

• MAIN ENGINE STARTING ( MES )

• CARGO HEATING

PNEUMATIC SYSTEM

• INTRODUCTION

• INPUT OUTPUT

• SOURCES OF AIR SUPPLY:• a) ENGINES( TWO BLEED PORTS )• b) APU• c) GPU d) TURBO COMPRESSOR(B707)

PNEUMATIC SYSTEM

AIR SOURCES

• 1- ENGINES : MAIN SOURSE DURING FLIGHT

• 2- APU : a) MAIN SOURSE DURING GROUND b) BACKUP SOURSE DURING FLIGHT. ------ APU LIMITATION :---------

AIR SOURCES

• 3- GPU

(AIR STARTER /Air Ground Cart)

- ALTERNATE SOURSE TO APU DURING GROUND - Max Pressure allowed : 60 psi

AIR SOURCES

• 4- TURBO COMPRESSOR :

T C

Eng. Bleed

Amb. Air

( suction)

To Pneumatic. Sys.

Exaust

AIR SOURCES

• TURBO COMPRESSOR ( T.C) :

• Location: above Eng.(2), Eng.(3), Eng.(4) in

B707

• Why T.C ?To provide clean air for

Pneumatic system on ground

SYSTEM DESCRIPTION

REGULATION REGULATION

L.H USERS R.H USERS

Eng. 1 APU Eng. 2

GPU

X-BLEED

VLV.

APU BLEED VLV

PNEUMATIC SUBYSTEMS

–A) ENG BLEED SYSTEM

–B) APU BLEED & X-BLEED SYSTEM

A) ENG BLEED SYSTEM

FUNCTION: 1) ENG. BLEED SUPPLY SELECTION ( HBV , IPC)

2) ENG. PRESSURE REGULATION & PROTECTION

3) ENG. TEMPERATURE REGULATION & PROTECTION

SYSTEM DESCRIPTION

• SYSTEM TARGETS: ( 44 PSI ,

200 C)

• SYSTEM CONCEPTS:

a) PRIORITY LOGIC

• b) SLAVATORY RELATION

c) DURING MES

SYSTEM DESCRIPTION

•SYSTEM CONCEPTS

• a) ASYMMETRIC OF H/D

• b)PRESSURE REGULATION PRIOR

TEMP. REGULATION

SYSTEM COMPONENTS

• 1- BLEED PORTS ( IPC , HPV )a) FUNCTION

b) OPERATION Note : HPSOV) = HPV

SYSTEM COMPONENTS

• 2- ENGINE BLEED VALVE ( PRSOV /ENG. PRV)

a) FUNCTIONb) OPERATION

SYSTEM COMPONENTS

• 3- HEAT EXCHANGER( = PRECOOLER )

a) FUNCTION

• b) OPERATION

SYSTEM COMPONENTS

• 4- FAN AIR VALVE (= FAV)

a) FUNCTION b) OPERATION

SYSTEM COMPONENTS

• 5- OVER PRESSURE VALVE

a) FUNCTION b) OPERATION

SYSTEM COMPONENTS

• 6- PNEUMATIC CONTROLLER

a) FUNCTION b) OPERATION

SYSTEM CONTROLS

SYSTEM INDICATION

APU & X-BLEED

• APU BLEED VALVE

• X- BLEED VALVE

APU BLEED VALVE

• a) FUNCTION• b) RULES : 1-

APU SUPPLY LIMITATION 2- PIORITY LOGIC 3- SLAVATORY RELATION 4- APU O/P MODIFICATION

• c) OPERATION

X-BLEED VALVE

• FUNCTION:

• OPERATION :

a) AUTO MODE b) MANUAL MODE

LEAK DETECTION SYSTEM

• A) LEAK DECTION

• B) LEAK DECTION CONSEQUENCE

DANGERS OF AIR LEAK

• 1- FIRE HAZARDS

• 2- STRUCTURE DAMAGE

POWER SUPPLY

SWITCH LAMP

FLAME

CORE ( CONDUCTOR)

INSULATOR

INCONEL TUBING

OPERATION

• A) DETECTION :

• LOOPS CONTINOUS MONITORING

– B) CONSEQUENCE

AFFECTED AREA IS ISOLATED

• C) INDICATION

REVIEW QUESTIONS

• 1-IF X-BLEED VALVE IS SHUT AND APU BLEED VALVE OPENS,….WHAT WILL HAPPEN ?

•END