<< >> NASA ASRS Report 984441, December 2011

A LR45 cockpit filled with smoke and fumes as it began a descent so the crew declared an emergency and diverted. A cockpit temperature control valve and environmental control system (ecs) temperature controller were replaced.

Attributes
ACN	984441
Time
Date	201112
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Learjet 45
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning Distribution Ducting Clamps Connectors
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 112.5 Flight Crew Total 12500 Flight Crew Type 1500
Events
Anomaly	Aircraft Equipment Problem Critical Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

After beginning an initial descent from FL430 and passing through (around) FL400; the flight crew noticed fumes and smoke accumulating in the cockpit and cabin. An emergency descent was immediately initiated with appropriate memory items and checklist completed. ATC was notified and vectors to a suitable airport were given. After passing through (around) FL200 the smoke and fumes rapidly dissipated and a normal landing was made with no further incident. [We needed a] replacement of a malfunctioning cockpit temperature control valve and replacement of the ecs temperature controller. I also informed [FSDO] that there was no evidence of a fire.

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Original NASA ASRS Text

Title: A LR45 cockpit filled with smoke and fumes as it began a descent so the crew declared an emergency and diverted. A cockpit temperature control valve and environmental control system (ECS) temperature controller were replaced.

Narrative: After beginning an initial descent from FL430 and passing through (around) FL400; the flight crew noticed fumes and smoke accumulating in the cockpit and cabin. An emergency descent was immediately initiated with appropriate memory items and checklist completed. ATC was notified and vectors to a suitable airport were given. After passing through (around) FL200 the smoke and fumes rapidly dissipated and a normal landing was made with no further incident. [We needed a] replacement of a malfunctioning cockpit temperature control valve and replacement of the ECS temperature controller. I also informed [FSDO] that there was no evidence of a fire.

Data retrieved from NASA's ASRS site as of April 2012 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.