Flight crew of an medium large transport air carrier aircraft declared an emergency after losing cabin pressurization during climb at high altitude resulting in the passenger mask dropping and used until a lower altitude was reached.

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Attributes
ACN	255951
Time
Date	199310
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pit
State Reference	PA
Altitude	msl bound lower : 24000 msl bound upper : 28000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 10000 flight time type : 250
ASRS Report	255951
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : private pilot : instrument pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 140 flight time total : 8000 flight time type : 4000
ASRS Report	256145
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

At approximately 28000 ft MSL we lost the cabin pressurization. Proper procedures were accomplished according to checklist. Captain asked for lower and altimeter setting and began emergency descent to 14000 ft. First officer worked at controling cabin, however, pressurization could not be maintained even though valve indicated closed. Proper PA's were made and verification of oxygen masks in passenger cabin was checked. We elected to continue on to ewr at 10000 ft and landed with no further incident after declaring an emergency. Emergency vehicles met us upon landing even though we told them we did not require them 2 times. EMS was called to meet us at the gate in case passenger required assistance. Supplemental information from acn 256145: but there were no medical problems due to emergency descent or unpressurized flight. Maintenance found part of the seal missing around the aft cargo door.

Original NASA ASRS Text

Title: FLC OF AN MLG ACR ACFT DECLARED AN EMER AFTER LOSING CABIN PRESSURIZATION DURING CLB AT HIGH ALT RESULTING IN THE PAX MASK DROPPING AND USED UNTIL A LOWER ALT WAS REACHED.

Narrative: AT APPROX 28000 FT MSL WE LOST THE CABIN PRESSURIZATION. PROPER PROCS WERE ACCOMPLISHED ACCORDING TO CHKLIST. CAPT ASKED FOR LOWER AND ALTIMETER SETTING AND BEGAN EMER DSCNT TO 14000 FT. FO WORKED AT CTLING CABIN, HOWEVER, PRESSURIZATION COULD NOT BE MAINTAINED EVEN THOUGH VALVE INDICATED CLOSED. PROPER PA'S WERE MADE AND VERIFICATION OF OXYGEN MASKS IN PAX CABIN WAS CHKED. WE ELECTED TO CONTINUE ON TO EWR AT 10000 FT AND LANDED WITH NO FURTHER INCIDENT AFTER DECLARING AN EMER. EMER VEHICLES MET US UPON LNDG EVEN THOUGH WE TOLD THEM WE DID NOT REQUIRE THEM 2 TIMES. EMS WAS CALLED TO MEET US AT THE GATE IN CASE PAX REQUIRED ASSISTANCE. SUPPLEMENTAL INFO FROM ACN 256145: BUT THERE WERE NO MEDICAL PROBS DUE TO EMER DSCNT OR UNPRESSURIZED FLT. MAINT FOUND PART OF THE SEAL MISSING AROUND THE AFT CARGO DOOR.

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.