LJ35 diverts to nearest suitable airport due to smoke in cabin.

Attributes
ACN	804365
Time
Date	200809
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : boi.airport
State Reference	ID
Altitude	msl single value : 41000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc.artcc
Operator	general aviation : corporate
Make Model Name	Learjet 35
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : flight engineer pilot : cfi pilot : commercial pilot : atp
Experience	flight time last 90 days : 200 flight time total : 4300 flight time type : 600
ASRS Report	804365
Events
Anomaly	other anomaly
Independent Detector	other flight crewa
Resolutory Action	aircraft : evacuated flight crew : diverted to another airport flight crew : declared emergency
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Cruising a FL410 5 mins prior to beginning the descent into boi the PIC turned on the windshield heat as preparation for the descent. Approximately 90 seconds later the aft went into emergency pressurization and smoke began filling the back of the cabin. The crew immediately informed ATC ZLC of the problem; declared an emergency; and requested vectors to the nearest airport with a 5000 ft runway. The crew began the descent for an emergency landing and proceeded with the checklist for smoke in the aircraft. Once the checklist was completed; the crew began troubleshooting the source of the failure by turning off 1 bleed air switch at a time as well as a reduction of power. No change in the position of the bleed air switches would eliminate the source of the smoke from the air ducts from the right side of the aircraft. The crew landed without additional incident and immediately egressed the aircraft.

Original NASA ASRS Text

Title: LJ35 DIVERTS TO NEAREST SUITABLE ARPT DUE TO SMOKE IN CABIN.

Narrative: CRUISING A FL410 5 MINS PRIOR TO BEGINNING THE DSCNT INTO BOI THE PIC TURNED ON THE WINDSHIELD HEAT AS PREPARATION FOR THE DSCNT. APPROX 90 SECONDS LATER THE AFT WENT INTO EMER PRESSURIZATION AND SMOKE BEGAN FILLING THE BACK OF THE CABIN. THE CREW IMMEDIATELY INFORMED ATC ZLC OF THE PROB; DECLARED AN EMER; AND REQUESTED VECTORS TO THE NEAREST ARPT WITH A 5000 FT RWY. THE CREW BEGAN THE DSCNT FOR AN EMER LNDG AND PROCEEDED WITH THE CHKLIST FOR SMOKE IN THE ACFT. ONCE THE CHKLIST WAS COMPLETED; THE CREW BEGAN TROUBLESHOOTING THE SOURCE OF THE FAILURE BY TURNING OFF 1 BLEED AIR SWITCH AT A TIME AS WELL AS A REDUCTION OF PWR. NO CHANGE IN THE POS OF THE BLEED AIR SWITCHES WOULD ELIMINATE THE SOURCE OF THE SMOKE FROM THE AIR DUCTS FROM THE R SIDE OF THE ACFT. THE CREW LANDED WITHOUT ADDITIONAL INCIDENT AND IMMEDIATELY EGRESSED THE ACFT.

Data retrieved from NASA's ASRS site as of May 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.