Primary finding
Probable cause
The blocked numer 1 engine drain manifold.
Investigator assessment
Analysis narrative
While taxiing, the number one engine fire warning light illuminated. The pilot and co-pilot initiated an engine shutdown and completed appropriate emergency procedures. An examination of the aircraft revealed that the no. 1 engine manifold was blocked with coking deposits resulting in fuel spill and subsequent fire within the nacelle.
Source record
Factual narrative
On March 4, 1994 at 1450 central standard time, an Aerospatiale ATR-72, N253AT, operating as American Eagle flight 3740, experienced an engine cowling fire while taxiing at the DFW Airport, Dallas/Fort Worth, Texas. The four crew members and 52 passengers were not injured. Visual meteorological conditions prevailed for the intended 14 CFR Part 121 flight. In the Pilot/Operator report, the pilot stated that the number one engine fire warning light illuminated. He further stated that he and the co-pilot performed the emergency checklist and then evacuated the passengers out of the rear door of the aircraft. The fire was suppressed by the crew using the published emergency procedures. A detailed examination of the aircraft by the operator revealed that the No. 1 engine drain manifold was blocked with "coking" deposits. The operator also stated that "internal pressure caused a fuel spill inside the nacelle with resultant fire." -