<< >> NASA ASRS Report 300286, March 1995

While climbing through FL350, an air carrier experienced a loss of pressurization which necessitated an emergency declaration, and a rapid descent.

Attributes
ACN	300286
Time
Date	199503
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : obk
State Reference	IL
Altitude	msl bound lower : 10000 msl bound upper : 32500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : zau
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : commercial pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 210 flight time total : 3600 flight time type : 800
ASRS Report	300286
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : atp pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 13000 flight time type : 6000
ASRS Report	300165
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : overcame equipment problem flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

On an air carrier flight from ind to msp, on mar/sat/95, we experienced a partial loss of cabin pressure, while climbing through FL325. The cabin altitude climbed to 11500 ft. The PNF declared an emergency, and started a rapid descent in accordance with emergency procedures. We descended the aircraft to 10000 ft. The cabin altitude stabilized at 7400 ft and we continued to msp at 10000 ft without further incident. Callback conversation with reporter revealed the following information. The reporter states that the PNF declared an emergency and an immediate descent was initiated, in order to keep the cabin from climbing any further. The flight deck crew donned oxygen masks on a 727-200 when a fairly rapid cabin rate of climb was noted -- beginning with 6500 ft to 11500 ft. After landing, the so heard from the mechanic that the problem was probably related to an outflow valves failure to close. The reporter states that the flight was given emergency priority with chicago, but that minnepolis was unaware of their having declared an emergency. The aurthority was actually exercised a second time, to preserve minimum alternate fuel. A written report was not requested by the administrator.

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Original NASA ASRS Text

Title: WHILE CLBING THROUGH FL350, AN ACR EXPERIENCED A LOSS OF PRESSURIZATION WHICH NECESSITATED AN EMER DECLARATION, AND A RAPID DSCNT.

Narrative: ON AN ACR FLT FROM IND TO MSP, ON MAR/SAT/95, WE EXPERIENCED A PARTIAL LOSS OF CABIN PRESSURE, WHILE CLBING THROUGH FL325. THE CABIN ALT CLBED TO 11500 FT. THE PNF DECLARED AN EMER, AND STARTED A RAPID DSCNT IN ACCORDANCE WITH EMER PROCS. WE DSNDED THE ACFT TO 10000 FT. THE CABIN ALT STABILIZED AT 7400 FT AND WE CONTINUED TO MSP AT 10000 FT WITHOUT FURTHER INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. THE RPTR STATES THAT THE PNF DECLARED AN EMER AND AN IMMEDIATE DSCNT WAS INITIATED, IN ORDER TO KEEP THE CABIN FROM CLBING ANY FURTHER. THE FLT DECK CREW DONNED OXYGEN MASKS ON A 727-200 WHEN A FAIRLY RAPID CABIN RATE OF CLB WAS NOTED -- BEGINNING WITH 6500 FT TO 11500 FT. AFTER LNDG, THE SO HEARD FROM THE MECH THAT THE PROBLEM WAS PROBABLY RELATED TO AN OUTFLOW VALVES FAILURE TO CLOSE. THE RPTR STATES THAT THE FLT WAS GIVEN EMER PRIORITY WITH CHICAGO, BUT THAT MINNEPOLIS WAS UNAWARE OF THEIR HAVING DECLARED AN EMER. THE AURTHORITY WAS ACTUALLY EXERCISED A SECOND TIME, TO PRESERVE MINIMUM ALTERNATE FUEL. A WRITTEN RPT WAS NOT REQUESTED BY THE ADMINISTRATOR.

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.