# NTSB FTW95IA064: Aerospatiale ATR-72-212, N633AS, Dfw Airport, TX, December 12, 1994 - Type: NTSB incident investigation - Classification: Incident · No injuries · Incident investigation · Final report - Date: December 12, 1994, 09:00 local (15:00 UTC) - Place: Dfw Airport, TX - Location: 32.8972° N, 97.0377° W: Placed by OpenAirDocs at DALLAS-FORT WORTH INTL (DFW), within about a mile (OpenAirDocs) - Nearby events: https://openairdocs.org/map.md?lat=32.8972&lon=-97.0377&mi=10 - Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 38 uninjured - Status: Completed, report May 4, 1995 - Report: Approved by Office Director - NTSB case key (mKey): 19262 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW95IA064 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/19262/pdf - Page: https://openairdocs.org/ntsb/FTW95IA064 ## Probable cause FIRE DUE TO THE INTERNAL FAILURE OF THE NUMBER ONE DC STARTER-GENERATOR. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, taxi - electrical system,generator - failure (cause) - fire extinguishing equipment - initiated, pilot in command - electrical system,generator - fire (cause) - evacuation - performed, pilot in command - Fire, taxi ## Analysis THE NUMBER ONE ENGINE FIRE WARNING LIGHT ILLUMINATED WHILE TAXIING BACK TO THE GATE AFTER THE #1 GENERATOR FAULT LIGHT HAD ILLUMINATED WHILE HOLDING SHORT FOR DEPARTURE. SMOKE WAS OBSERVED COMING FROM THE ENGINE AND THE CREW DISCHARGED BOTH ONBOARD FIRE BOTTLES AND SECURED THE ENGINE. AN EMERGENCY EVACUATION WAS ORDERED BY THE CREW ON THE ACTIVE TAXIWAY VIA THE RIGHT AFT SERVICE DOOR. THERE WERE NO REPORTED INJURIES DURING THE EVACUATION. THE ENGINE COWLING AND SEVERAL ACCESSORIES SUSTAINED FIRE DAMAGE. THE FIRE WAS THE RESULT OF THE INTERNAL FAILURE OF THE GENERATOR DUE TO FAILURE OF A GENERATOR BEARING. ## Factual narrative On December 12, 1994, at 0900 central standard time, an Aerospatiale ATR 72-212, N633AS, sustained minor damage while taxiing at the Dallas/Fort Worth International Airport, Texas, (DFW). There were no injuries to the 4 crewmembers and the 34 passengers aboard the airplane. Visual meteorological conditions prevailed for the scheduled 14 CFR Part 121 flight. The airplane was being operated by Atlantic Southeast Airlines as ASA Flight 7694, on a scheduled domestic passenger service from DFW to Oklahoma City, Oklahoma. According to the operator, the airplane was holding short of the runway for departure, when the flight crew heard a noise followed by the illumination of the #1 generator fault light. The crew contacted dispatch and related the events to their maintenance personnel. While taxiing back to the gate for further troubleshooting, the fire warning light for the number one engine illuminated and smoke was observed coming from the engine. The crew discharged both onboard fire bottles and secured the engine. An emergency evacuation was ordered by the flight crew on taxiway alpha via the right aft service door. There were no reported injuries during the evacuation. A post- incident inspection of the affected engine by a Federal Aviation Administrator inspector confirmed minor damage and evidence of fire due to the internal failure of the #1 DC starter-generator. The failed component, part number 8260-121, serial number 8260- 121, serial number 1232, had accumulated a total of 646.6 hours since last overhaul, and 2,992 hours since new. A teardown confirmed that the internal failure was the result of the failure of a generator bearing. ## Aircraft - Registration: N633AS (not matched to a registry record) - Reported make and model: AEROSPATIALE ATR-72-212 (ATR 72-212) - Category: Airplane - Serial number: 344 - Airframe hours: 4133 - Engines: P&W PW127 2750 horsepower turbo prop - Damage: Minor damage - Fire: On-Ground - Flight: Part 121 - Operator: Atlantic Southeast Airlines, doing business as Asa - Registered owner: Antoine Finance Corp. - Airworthiness certificate: Standard, Transport - Departed: DFW, TX - Destination: OKC, OKLAHOMA CITY, OK - Flight plan: IFR - Airport: DFW, Dallas/Fort Worth Airport, runway 18L, 11,388 × 200 ft, concrete ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 39; commercial, airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 12,800 total, 1,338 in this make and model, 231 in the last 90 days, 81 in the last 30 days, 7 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 180° at 11 knots - Visibility: 20 statute miles - Lowest ceiling: none - Temperature: 37 °F, dew point 30 °F - Altimeter: 30.00 inHg - Observed at: DFW, 2 nm away ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Incident 19941212043929I](https://openairdocs.org/incident/19941212043929I), Dec 12, 1994: Aerosp ATR72212, Dallas-Ft Worth, TX, Minor damage. Generator fault light came on holding at runway. Fire light on. Smoke, shutdown, evacuated. Starter generator defec From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.