Neum谩tico y Presurizaci贸n
X BLEED VALVE
APU BLEED VALVE
Precooler
Precooler
GPU BLEED VALVE
BLEED VALVE
APU
IP
HP
ENG 1
HP
IP
ENG 2
Neumático • ALIMENTACIÓN CRUZADA • Una válvula permite el aislamiento o la
•
interconexión de los sistemas de sangrado del lado izquierdo (ENG 1) y del lado derecho (ENG 2). Está controlada eléctricamente mediante el selector X BLEED del Panel de Aire Acondicionado y es accionada por dos motores eléctricos, uno para el modo manual y otro para el modo automático.
Neumático
• La válvula X BLEED en
modo automático se abre (AUTO) cuando se usa el sangrado del APU.
• Se cierra cuando se
detecta alguna pérdida de aire (excepto durante Puesta en Marcha de Motor).
Neumático • Los elementos sensores
•
están unidos, formando un lazo sencillo en los pylons y APU, y un lazo doble en los planos. Cuando los dos lazos detectan una pérdida o cuando un lazo detecta la pérdida y el otro está inoperativo se activa una señal de pérdidas en planos
Neumático • En caso de señal de pérdida en planos: – Se cierra automáticamente la válvula BLEED en el lado correspondiente. – Se ilumina la luz FAULT asociada en el panel AIR COND.
Neumático – La válvula X BLEED se cierra automáticamente (excepto durante la puesta en marcha de motor). – Si la válvula APU BLEED está abierta, y si la pérdida afecta al plano izquierdo, se cierra automáticamente (excepto durante la puesta en marcha de motor).
Neumรกtico
System design - Devices
The proper cabin pressure is automatically maintained by:
2 Cabin Pressure Controllers (CPC) © AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
Outflow Valve Safety Valves and negative relief valve
CABIN DEPRESSURIZATION
OLM FBW 2008 – Toulouse – 27-29 May 2008
System design – Automatic mode Cabin Pressure Controllers
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
Electric Motor
CPC 1
CPC 2
Electric Motor
Outflow Valve
CABIN DEPRESSURIZATION
OLM FBW 2008 – Toulouse – 27-29 May 2008
System design - Automatic Mode The 2 CPCs receive main information from:
FMGC
ADIRS
LGCIU
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
This enables the CPCs to control the outflow valve to:
Adapt the cabin altitude and V/S to the flight plan and different flight phases
Manage the cabin altitude if the FM data are lost
Ensure there is no residual cabin pressure on ground
One CPC is active at a time
The second system still monitors the cabin altitude parameters
CABIN DEPRESSURIZATION
OLM FBW 2008 – Toulouse – 27-29 May 2008
System design – Cabin altitude If the cabin altitude reaches 9550 feet ECAM warning
16000
12000
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
8000
4000
0 CABIN DEPRESSURIZATION
OLM FBW 2008 – Toulouse – 27-29 May 2008
System design – Cabin altitude If the cabin altitude reaches 14000 feet automatic deployment of oxygen masks
16000
12000
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
8000
4000
0 CABIN DEPRESSURIZATION
OLM FBW 2008 – Toulouse – 27-29 May 2008
In-Service events description Nearly all reported events bleed
overheat after one engine bleed system failure
Typical event description First
Engine Bleed system failure ECAM procedure application – X-BLEED open
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
– 1 BLEED / 2 PACKS configuration Loss of the remaining bleed system due to overheat
Most common operational consequence In-Flight
Turn Back
Emergency
descent
DUAL BLEED LOSS on Single Aisle - Using the QRH procedure
OLM FBW 2008 – Toulouse – 27-29 May 2008
Normal Bleed System Operation
Normal Operation
PRECOOLER
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
Fan Air Valve (FAV) provides cold fan air to the PRECOOLER upon signal from the Temperature Control Thermostat (TCT)
DUAL BLEED LOSS on Single Aisle - Using the QRH procedure
TCT FAV BLEED VALVE
IP
HP
OLM FBW 2008 – Toulouse – 27-29 May 2008
Bleed System Failure – Identified cause Hidden failure in the FAV actuation system •TCT drift •Sense line leakage •FAV cover leakage
PRECOOLER
TCT FAV
1 BLEED / 2 PACKs operation
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
BLEED VALVE
Increase of bleed air temperature
IP
HP
FAV actuation system fails to compensate DUAL BLEED LOSS on Single Aisle - Using the QRH procedure
OLM FBW 2008 – Toulouse – 27-29 May 2008
DUAL BLEED FAULT procedure Scenario of the reported events PACK 2
PACK 1
AIR ENG 2 BLEED FAULT - ENG 2 BLEED…….OFF
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
- X BLEED…………OPEN
HP
IP
APU
ENG 1 BLEED
DUAL BLEED LOSS on Single Aisle - Using the QRH procedure
IP
HP
ENG 2 BLEED
OLM FBW 2008 – Toulouse – 27-29 May 2008
DUAL BLEED FAULT procedure Scenario of the reported events PACK 2
PACK 1
AIR ENG 2 BLEED FAULT - ENG 2 BLEED…….OFF
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
- X BLEED…………OPEN
HP
IP
APU
ENG 1 BLEED
DUAL BLEED LOSS on Single Aisle - Using the QRH procedure
IP
HP
ENG 2 BLEED
OLM FBW 2008 – Toulouse – 27-29 May 2008
DUAL BLEED FAULT procedure Scenario of the reported events PACK 2
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
PACK 1
HP
IP
?
AIR ENG 2 BLEED FAULT - ENG 2 BLEED…….OFF - X BLEED…………OPEN
APU
ENG 1 BLEED
DUAL BLEED LOSS on Single Aisle - Using the QRH procedure
IP
HP
ENG 2 BLEED
OLM FBW 2008 – Toulouse – 27-29 May 2008
DUAL BLEED FAULT procedure
If ENG 1 (2) BLEED was lost due to a :
X-BLEED CLOSED
LEAK on side 1 (2) ENG 1 (2) FIRE (cierra BLEED y Pack)
© AIRBUS S.A.S. All rights reserved. Confidential and proprietary document.
Start Air Valve 1 (2) failed open
X-BLEED OPEN
DUAL BLEED LOSS on Single Aisle - Using the QRH procedure
In all other cases
OLM FBW 2008 – Toulouse – 27-29 May 2008
CAB PR EXCESS CAB ALT
CAB PR EXCESS CAB ALT
CAB PR EXCESS CAB ALT