A320 crew lost cabin pressurization in ZOB class a airspace.

Attributes
ACN	510265
Time
Date	200105
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : cle.airport
State Reference	OH
Altitude	msl single value : 37000
Environment
Light	Night
Aircraft 1
Controlling Facilities	artcc : zob.artcc tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 158 flight time total : 20000 flight time type : 491
ASRS Report	510265
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin pressure eicas warning cabin altitude warning horn other flight crewa other flight crewb
Resolutory Action	flight crew : landed in emergency condition flight crew : declared emergency flight crew : diverted to another airport other
Consequence	other other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : repair
Supplementary
Problem Areas	Aircraft Company
Primary Problem	Aircraft

Narrative:

At approximately XA45Z, FL370,. Approximately 110 NM west of cle, 'cabin pressure system #1 and #2 fault' ECAM displayed, followed immediately by 'cabin pressure excess cabin altitude' ECAM. (Cabin pressure controller #2 previously deferred.) both pilots donned oxygen masks, emergency declared with ZOB, and emergency descent began to 10000 ft. As cle was directly on our path, and both pilots well familiar with airport and support facilities, decision made to divert to cle. Emergency descent qrc to include reference action items of A320 handbook accomplished. Flight attendants were briefed and told to prepare cabin for unscheduled landing in cle. Cabin altitude reached at least 12500 ft. However, passenger oxygen masks did not deploy. All appropriate checklists were performed, and an uneventful landing was made in cle. Aircraft and crew overnighted in cle, and on may/xa/01 crew ferried the aircraft to ord unpressurized on a maintenance ferry permit. Crew coordination and interaction with flight attendants worked very well. There are a few concerns about the verbiage in the A20 handbook that came to light in our particular situation. These can be addressed at the appropriate time.

Original NASA ASRS Text

Title: A320 CREW LOST CABIN PRESSURIZATION IN ZOB CLASS A AIRSPACE.

Narrative: AT APPROX XA45Z, FL370,. APPROX 110 NM W OF CLE, 'CABIN PRESSURE SYS #1 AND #2 FAULT' ECAM DISPLAYED, FOLLOWED IMMEDIATELY BY 'CABIN PRESSURE EXCESS CABIN ALT' ECAM. (CABIN PRESSURE CONTROLLER #2 PREVIOUSLY DEFERRED.) BOTH PLTS DONNED OXYGEN MASKS, EMER DECLARED WITH ZOB, AND EMER DSCNT BEGAN TO 10000 FT. AS CLE WAS DIRECTLY ON OUR PATH, AND BOTH PLTS WELL FAMILIAR WITH ARPT AND SUPPORT FACILITIES, DECISION MADE TO DIVERT TO CLE. EMER DSCNT QRC TO INCLUDE REF ACTION ITEMS OF A320 HANDBOOK ACCOMPLISHED. FLT ATTENDANTS WERE BRIEFED AND TOLD TO PREPARE CABIN FOR UNSCHEDULED LNDG IN CLE. CABIN ALT REACHED AT LEAST 12500 FT. HOWEVER, PAX OXYGEN MASKS DID NOT DEPLOY. ALL APPROPRIATE CHKLISTS WERE PERFORMED, AND AN UNEVENTFUL LNDG WAS MADE IN CLE. ACFT AND CREW OVERNIGHTED IN CLE, AND ON MAY/XA/01 CREW FERRIED THE ACFT TO ORD UNPRESSURIZED ON A MAINT FERRY PERMIT. CREW COORD AND INTERACTION WITH FLT ATTENDANTS WORKED VERY WELL. THERE ARE A FEW CONCERNS ABOUT THE VERBIAGE IN THE A20 HANDBOOK THAT CAME TO LIGHT IN OUR PARTICULAR SIT. THESE CAN BE ADDRESSED AT THE APPROPRIATE TIME.

Data retrieved from NASA's ASRS site as of July 2007 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.