LJ36 make emergency descent due to loss of cabin pressure. Unable to communicate emergency to ATC due to inoperative oxygen mask mikes.

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Attributes
ACN	696325
Time
Date	200605
Local Time Of Day	1201 To 1800
Place
Locale Reference	intersection : zzzzz
State Reference	FO
Altitude	msl bound lower : 26500 msl bound upper : 41000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzzz.artcc
Operator	general aviation : corporate
Make Model Name	Learjet 36
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
Experience	flight time last 90 days : 199 flight time total : 6326 flight time type : 2164
ASRS Report	696325
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument pilot : private technician : powerplant technician : airframe
Experience	flight time last 90 days : 123 flight time total : 534 flight time type : 210
ASRS Report	696324
Events
Anomaly	altitude deviation : excursion from assigned altitude
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : overcame equipment problem none taken : anomaly accepted
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance ATC Human Performance
Primary Problem	Aircraft

Narrative:

We suffered a loss of cabin pressure after the crew shut off 1 bleed air switch per the emergency checklist for the bleed air warning light. The passenger masks deployed; and the crew executed a descent while troubleshooting the problem. After the crew restored proper function of the pressurization system; the crew returned to their assigned altitude and continued safely. The crew did not obtain clearance to deviation from their assigned altitude because they were not able to communicate via the microphone in their oxygen masks. After the aircraft returned to base; maintenance personnel verified that the microphone in each mask was inoperative.

Original NASA ASRS Text

Title: LJ36 MAKE EMER DSCNT DUE TO LOSS OF CABIN PRESSURE. UNABLE TO COMMUNICATE EMER TO ATC DUE TO INOP OXYGEN MASK MIKES.

Narrative: WE SUFFERED A LOSS OF CABIN PRESSURE AFTER THE CREW SHUT OFF 1 BLEED AIR SWITCH PER THE EMER CHKLIST FOR THE BLEED AIR WARNING LIGHT. THE PAX MASKS DEPLOYED; AND THE CREW EXECUTED A DSCNT WHILE TROUBLESHOOTING THE PROB. AFTER THE CREW RESTORED PROPER FUNCTION OF THE PRESSURIZATION SYS; THE CREW RETURNED TO THEIR ASSIGNED ALT AND CONTINUED SAFELY. THE CREW DID NOT OBTAIN CLRNC TO DEV FROM THEIR ASSIGNED ALT BECAUSE THEY WERE NOT ABLE TO COMMUNICATE VIA THE MIKE IN THEIR OXYGEN MASKS. AFTER THE ACFT RETURNED TO BASE; MAINT PERSONNEL VERIFIED THAT THE MIKE IN EACH MASK WAS INOP.

Data retrieved from NASA's ASRS site as of January 2009 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.