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SYSTEM PRESENTATION
TMUPNE201-P01 LEVEL 1
EFFECTIVITY 36-00-00 Page 3
May 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 36 PNEUMATIC SYSTEM
UF94200
EFFECTIVITY Page 3
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SYSTEM PRESENTATION
CROSS BLEED VALVE
The cross bleed valve, installed in the cross feed
line, allows the left and right bleed systems to be
interconnected or isolated.
The cross bleed valve is electrically controlled by
two independent electrical motors. In auto mode, it
is controlled to the same position as the APU bleed
valve. In manual mode, it is controlled independently
of APU bleed valve.
LEAK DETECTION
A leak detection system is provided to detect overheat
in the vicinity of hot air ducts, in the pylons, wings
and fuselage.
The leak detection system monitors the following zones:
- Wing and packs: ensured by a double loop of
sensing elements.
The left loops also monitor bleed ducts up to
cross bleed valve and APU check valve.
The right loops also monitor bleed ducts up to
cross bleed valve.
- Pylons: ensured by a single loop with one
sensing element.
- APU bleed duct (from APU bleed valve to check
valve): ensured by a single loop of sensing
elements.
MONITORING
Engine bleed pressure, temperature and leak detection
are monitored by two bleed monitoring computers:
- In normal configuration, computer 1 monitors
the left bleed system and computer 2 the right
bleed system.
- If one Bleed Monitoring Computer fails, the
remaining BMC is able to monitor both bleed
systems (except for Pylon leak and APU leak
detection).
USERS
The pneumatic system supplies pressurized air to
different users.
The users are:
- the engine start system,
- the wing ant-ice system,
- the air conditioning pack,
- the water tank and hydraulic reservoir
pressurization,
- the AFT cargo heating (Optional),
- the nacelle anti-ice valve (CFM only).
TMUPNE201-T01 LEVEL 1
EFFECTIVITY 36-00-00 Page 4
May 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 36 PNEUMATIC SYSTEM
UF94200
EFFECTIVITY Page 4
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SELF EXAMINATION
Does the APU bleed valve opening have priority
over the engine bleed valves opening ?
A - YES.
B - NO.
TMUPNE201 LEVEL 1
EFFECTIVITY 36-00-00 Page 5
May 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 36 PNEUMATIC SYSTEM
UF94200
EFFECTIVITY Page 5
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THIS PAGE INTENTIONALLY LEFT BLANK
TMUPNE201 LEVEL 1
EFFECTIVITY 36-00-00 Page 6
May 31/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 36 PNEUMATIC SYSTEM
UF94200
EFFECTIVITY Page 6
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36 - PNEUMATIC
36-00-00 SYSTEM CONTROLS PRESENTATION
CONTENTS:
Engine Bleed Valve Pushbutton
APU Bleed Valve Pushbutton
Cross Bleed Valve Selector
TMUPNE301 LEVEL 1
EFFECTIVITY 36-00-00 Page 1
Jun 30/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 36 PNEUMATIC SYSTEM
UF94200
EFFECTIVITY Page 7
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SYSTEM CONTROLS PRESENTATION
ENGINE BLEED VALVE PUSHBUTTON
When pressed in, the related engine bleed valve opens,
provided the engine is running, the APU bleed not ON
and no fault is detected (by its Bleed Monitoring
Computer).
When released out, the related bleed valve and HP valve
are closed.
The HP valve opens if the bleed pressure is less than
36 psi.
APU BLEED VALVE PUSHBUTTON
When pressed in, the APU bleed valve opens provided
the APU is running and no leak is detected by BMC1.
When released out, the APU bleed valve is closed.
NOTE: When the APU bleed valve is open, the X bleed
valve is open and both engine bleed valves are
closed, provided X bleed valve selector at AUTO.
CROSS BLEED VALVE SELECTOR
In AUTO, the cross bleed valve takes the same
configuration as the APU bleed valve (closed or open).
When OPEN is selected, the cross bleed valve is
controlled to open.
When SHUT is selected, the cross bleed valve is
controlled to close.
NOTE: If SHUT is selected and the APU bleed valve is
open, only engine 2 bleed valve is open.
TMUPNE301-T01 LEVEL 1
EFFECTIVITY 36-00-00 Page 2
Jun 30/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 36 PNEUMATIC SYSTEM
UF94200
EFFECTIVITY Page 8
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