<< >> NASA ASRS Report 402290, May 1998

B727 aircraft in climb to cruise experienced depressurization, flight crew unable to control pressure declared emergency and diverted to close airport. Postflt revealed a clamp holding duct onto air conditioning pack water separator had come off.

Attributes
ACN	402290
Time
Date	199805
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : jax
State Reference	FL
Altitude	msl bound lower : 28000 msl bound upper : 28000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 90 flight time total : 1900 flight time type : 30
ASRS Report	402290
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 60 flight time total : 7500 flight time type : 350
ASRS Report	402597
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

While climbing through FL280 en route to our cruising altitude, the cabin altitude was observed climbing at greater than 2000 FPM. All items on the 'loss of pressurization' hard card were accomplished, but had no effect on regaining control of aircraft pressurization. All items on the 'emergency descent' checklist were accomplished. The aircraft leveled off at 10000 ft and diverted to atl. All passenger oxygen masks deployed during the descent. Maintenance later reported that the clamp holding a duct onto the air conditioning pack water separator had come off and was dumping air overboard rather than into the cabin.

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Original NASA ASRS Text

Title: B727 ACFT IN CLB TO CRUISE EXPERIENCED DEPRESSURIZATION, FLC UNABLE TO CTL PRESSURE DECLARED EMER AND DIVERTED TO CLOSE ARPT. POSTFLT REVEALED A CLAMP HOLDING DUCT ONTO AIR CONDITIONING PACK WATER SEPARATOR HAD COME OFF.

Narrative: WHILE CLBING THROUGH FL280 ENRTE TO OUR CRUISING ALT, THE CABIN ALT WAS OBSERVED CLBING AT GREATER THAN 2000 FPM. ALL ITEMS ON THE 'LOSS OF PRESSURIZATION' HARD CARD WERE ACCOMPLISHED, BUT HAD NO EFFECT ON REGAINING CTL OF ACFT PRESSURIZATION. ALL ITEMS ON THE 'EMER DSCNT' CHKLIST WERE ACCOMPLISHED. THE ACFT LEVELED OFF AT 10000 FT AND DIVERTED TO ATL. ALL PAX OXYGEN MASKS DEPLOYED DURING THE DSCNT. MAINT LATER RPTED THAT THE CLAMP HOLDING A DUCT ONTO THE AIR CONDITIONING PACK WATER SEPARATOR HAD COME OFF AND WAS DUMPING AIR OVERBOARD RATHER THAN INTO THE CABIN.

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.