<< >> NASA ASRS Report 444420, July 1999

A C500 climbing to FL410 declared an emergency due to loss of cabin pressure caused by an in-flight test water spray probe seal failure.

Attributes
ACN	444420
Time
Date	199907
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mkc.airport
State Reference	MO
Altitude	msl single value : 40800
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zkc.artcc
Operator	general aviation : corporate
Make Model Name	Citation I
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 80 flight time total : 3400 flight time type : 100
ASRS Report	444420
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin pressure indicator other flight crewa
Resolutory Action	flight crew : diverted to another airport flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Heard bang aft cabin approximately 200 ft prior to leveling at FL410. Observed cabin altitude climbing rapidly. Called for and conducted emergency descent. Only declared emergency because ARTCC would not authority/authorized immediate lower altitude. Leveled at 15000 ft, conducted control checks and crew member checks. Landed uneventfully at ict. Maintenance found seal around water spray pipe failed. Pipe used for in-flight icing testing -- non production.

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Original NASA ASRS Text

Title: A C500 CLBING TO FL410 DECLARED AN EMER DUE TO LOSS OF CABIN PRESSURE CAUSED BY AN INFLT TEST WATER SPRAY PROBE SEAL FAILURE.

Narrative: HEARD BANG AFT CABIN APPROX 200 FT PRIOR TO LEVELING AT FL410. OBSERVED CABIN ALT CLBING RAPIDLY. CALLED FOR AND CONDUCTED EMER DSCNT. ONLY DECLARED EMER BECAUSE ARTCC WOULD NOT AUTH IMMEDIATE LOWER ALT. LEVELED AT 15000 FT, CONDUCTED CTL CHKS AND CREW MEMBER CHKS. LANDED UNEVENTFULLY AT ICT. MAINT FOUND SEAL AROUND WATER SPRAY PIPE FAILED. PIPE USED FOR INFLT ICING TESTING -- NON PRODUCTION.

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.