A DHC8-300 developed a burnt rubber smell with smoke during taxi out so an emergency was declared; t...

Attributes
ACN	1005435
Time
Date	201204
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Dash 8-300
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning Distribution System
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

As we taxied out from bravo short of kilo; we smelled something that smelled like burnt rubber and that was followed by smoke in the flight deck. The first officer declared an emergency to ground control and we stopped the aircraft on taxiway bravo. We ran the aircraft fire or smoke checklist and then followed that down to the suspected source of bleed or air conditioning. Smoke began to subside a little when the bleeds were shut off. We shut down the engines and had fire rescue check the airplane for smoke or fire outside of the aircraft. They determined no signs of smoke or fire so we restarted the airplane; kept bleeds off and were followed back to the gate. On the way back; the smell worsened and stayed in the aircraft once we shutdown but the smoke never returned.

Original NASA ASRS Text

Title: A DHC8-300 developed a burnt rubber smell with smoke during taxi out so an emergency was declared; the engines shut down; and after Airfield Rescue and Fire Fighter inspections the aircraft restarted for a return to the gate.

Narrative: As we taxied out from Bravo short of Kilo; we smelled something that smelled like burnt rubber and that was followed by smoke in the flight deck. The First Officer declared an emergency to Ground Control and we stopped the aircraft on Taxiway Bravo. We ran the Aircraft Fire or Smoke Checklist and then followed that down to the suspected source of bleed or air conditioning. Smoke began to subside a little when the bleeds were shut off. We shut down the engines and had fire rescue check the airplane for smoke or fire outside of the aircraft. They determined no signs of smoke or fire so we restarted the airplane; kept bleeds off and were followed back to the gate. On the way back; the smell worsened and stayed in the aircraft once we shutdown but the smoke never returned.

Data retrieved from NASA's ASRS site as of July 2013 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.

A DHC8-300 developed a burnt rubber smell with smoke during taxi out so an emergency was declared; the engines shut down; and after airfield rescue and fire fighter inspections the aircraft restarted for a return to the gate.