An A320's number 2 high pressure bleed was MEL'ed and required to closed for descent. As the descent...

Attributes
ACN	860326
Time
Date	200911
Local Time Of Day	1201-1800
Environment
Light	Daylight
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	Pneumatic Valve/Bleed Valve
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 120 Flight Crew Total 12000 Flight Crew Type 7000
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

This aircraft had the number 2 hp bleed valve deferred. In accordance with the MEL; as we began our descent I turned off the number 2 bleed and opened the cross bleed. Almost immediately; the number 1 bleed overheated and closed. Remembering the anomaly listed in the flight manual; I immediately restored the number 2 bleed before we lost cabin pressure. After the number 1 bleed cooled; I restored it as well. We made gradual descents to keep the power up from idle and landed uneventfully with the bleeds in the normal configuration. While this anomaly is addressed in the flight manual; it is referenced to other ECAM procedures; not specifically to this MEL or deferral. I recommend the MEL for hp bleed deferral be updated with reference to this anomaly until all the faulty temperature sensors have been replaced.

Original NASA ASRS Text

Title: An A320's Number 2 High Pressure Bleed was MEL'ed and required to closed for descent. As the descent was begun and Bleed closed; the Number 1 Bleed overheated and closed requiring that the Number 2 Bleed be reopened.

Narrative: This aircraft had the Number 2 HP bleed valve deferred. In accordance with the MEL; as we began our descent I turned off the Number 2 bleed and opened the cross bleed. Almost immediately; the Number 1 bleed overheated and closed. Remembering the anomaly listed in the flight manual; I immediately restored the Number 2 bleed before we lost cabin pressure. After the Number 1 bleed cooled; I restored it as well. We made gradual descents to keep the power up from idle and landed uneventfully with the bleeds in the normal configuration. While this anomaly is addressed in the flight manual; it is referenced to other ECAM procedures; not specifically to this MEL or deferral. I recommend the MEL for HP bleed deferral be updated with reference to this anomaly until all the faulty temperature sensors have been replaced.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

An A320's number 2 high pressure bleed was MEL'ed and required to closed for descent. As the descent was begun and bleed closed; the number 1 bleed overheated and closed requiring that the number 2 bleed be reopened.