Air carrier medium large transport lost pressurization control at FL310 and made a rapid descent to ...

Attributes
ACN	137315
Time
Date	199002
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : fnt
State Reference	MI
Altitude	msl bound lower : 10000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : zob
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 11000 flight time type : 3000
ASRS Report	137315
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 10000 flight time type : 7000
ASRS Report	137106
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	other
Supplementary
Primary Problem	Aircraft

Narrative:

This is just an advisory report only! Aircraft was in cruise flight at 31000' when the pressurization controller failure causing loss of pressurization. A turn off the airway was initiated and an emergency descent to 10000' was accomplished. Normal/emergency checklists were completed. No injuries to crew or passenger except for some ear problems associated with the descent. An inspection of cabin was completed with no evidence of structural failure. Normal landing at chicago's O'hare airport was accomplished. Extremely excellent help was received from the personnel at chicago center ATC. FAA was notified of this incident and company irregularity reports were also filed. Supplemental information from acn 137106. Rapid descent to 10000' with ATC approval. Paramedics met aircraft but no one required medical attention.

Original NASA ASRS Text

Title: ACR MLG LOST PRESSURIZATION CTL AT FL310 AND MADE A RAPID DESCENT TO 10000'.

Narrative: THIS IS JUST AN ADVISORY RPT ONLY! ACFT WAS IN CRUISE FLT AT 31000' WHEN THE PRESSURIZATION CTLR FAILURE CAUSING LOSS OF PRESSURIZATION. A TURN OFF THE AIRWAY WAS INITIATED AND AN EMER DSCNT TO 10000' WAS ACCOMPLISHED. NORMAL/EMER CHKLISTS WERE COMPLETED. NO INJURIES TO CREW OR PAX EXCEPT FOR SOME EAR PROBS ASSOCIATED WITH THE DSCNT. AN INSPECTION OF CABIN WAS COMPLETED WITH NO EVIDENCE OF STRUCTURAL FAILURE. NORMAL LNDG AT CHICAGO'S O'HARE ARPT WAS ACCOMPLISHED. EXTREMELY EXCELLENT HELP WAS RECEIVED FROM THE PERSONNEL AT CHICAGO CTR ATC. FAA WAS NOTIFIED OF THIS INCIDENT AND COMPANY IRREGULARITY RPTS WERE ALSO FILED. SUPPLEMENTAL INFO FROM ACN 137106. RAPID DSCNT TO 10000' WITH ATC APPROVAL. PARAMEDICS MET ACFT BUT NO ONE REQUIRED MEDICAL ATTN.

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.

Air carrier medium large transport lost pressurization control at FL310 and made a rapid descent to 10000'.