BE400 flight crew experienced smoke from under the glareshield during descent. An emergency was decl...

Attributes
ACN	928765
Time
Date	201101
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Beechjet 400
Operating Under FAR Part	Part 91
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	Flight Dynamics
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 60 Flight Crew Total 4250 Flight Crew Type 1200
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 60 Flight Crew Total 2200 Flight Crew Type 300
Events
Anomaly	Aircraft Equipment Problem Critical Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

Descending from altitude to assigned altitude of FL240; gray smoke starting coming from underneath the glareshield. Both the first officer and myself followed our memory items for electrical smoke. After the memory items were followed; I took the controls and the radio and instructed the first officer to complete the electrical smoke checklist. I then declared an emergency with ATC and started an emergency decent. I also considered where the nearest landing airport would be. While I was considering airports; ATC offered direct to our destination and I accepted. That would get us turned toward land while we descended. We were offered several other airports by ATC but we declined them until the checklists were run and the decent completed. As part of the checklist to isolate the source; I turned the angle of attack indexer on the glareshield off. The smoke then stopped. Once the checklist and decent was completed; the nearest suitable airport was ZZZ. We informed ATC that is where we were going to land. The normal procedures were accomplished for landing. We landed without further incident. We informed the tower we wanted to be inspected by the fire department to insure there was no further smoke. Tower informed us the fire vehicles would meet us at the ramp. We taxied to the ramp; were inspected by the fire department; and cleared by them.

Original NASA ASRS Text

Title: BE400 flight crew experienced smoke from under the glareshield during descent. An emergency was declared and checklist procedures are commenced. When the angle of attack indexer is turned of the smoke stopped but the crew elected to continue their divert to the nearest suitable airport.

Narrative: Descending from altitude to assigned altitude of FL240; gray smoke starting coming from underneath the glareshield. Both the First Officer and myself followed our memory items for electrical smoke. After the memory items were followed; I took the controls and the radio and instructed the First Officer to complete the electrical smoke checklist. I then declared an emergency with ATC and started an emergency decent. I also considered where the nearest landing airport would be. While I was considering airports; ATC offered direct to our destination and I accepted. That would get us turned toward land while we descended. We were offered several other airports by ATC but we declined them until the checklists were run and the decent completed. As part of the checklist to isolate the source; I turned the angle of attack indexer on the glareshield off. The smoke then stopped. Once the checklist and decent was completed; the nearest suitable airport was ZZZ. We informed ATC that is where we were going to land. The normal procedures were accomplished for landing. We landed without further incident. We informed the Tower we wanted to be inspected by the fire department to insure there was no further smoke. Tower informed us the fire vehicles would meet us at the ramp. We taxied to the ramp; were inspected by the Fire Department; and cleared by them.

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.