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?
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
• 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
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
APU BLEED VALVE
• a) FUNCTION• b) RULES : 1-
APU SUPPLY LIMITATION 2- PIORITY LOGIC 3- SLAVATORY RELATION 4- APU O/P MODIFICATION
• c) OPERATION
OPERATION
• A) DETECTION :
• LOOPS CONTINOUS MONITORING
– B) CONSEQUENCE
AFFECTED AREA IS ISOLATED
• C) INDICATION