# NTSB CHI99LA239: Cessna 411, N660EM, Troy, MI, July 16, 1999 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: July 16, 1999, 18:00 local (22:00 UTC) - Place: Troy, MI - Coordinates: 42.560508, -83.17929 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=42.5605&lon=-83.1793&mi=10 - Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report January 18, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 46822 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI99LA239 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/46822/pdf - Page: https://openairdocs.org/ntsb/CHI99LA239 ## Probable cause Engine explosion/fire during start for undetermined reason. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Fire/explosion, standing - starting engine(s) - wing - fire - reason for occurrence undetermined (cause) - wing - exploded ## Analysis The pilot heard two loud backfires or explosions during the right engine start. He saw an area of the right wing expanded upward. The passenger saw flames coming from the right wing. The pilot shut down both engines. Two observers fought the fire with extinguishers. The pilot and passenger evacuated the airplane. The fire department chief said that a 'couple hundred foot' column of black smoke was observed and the response time was four to five minutes. He said the airplane was facing north, the wind was coming from the west, and the wind blew the flames away from the fuselage. He said the right wing outboard of the engine nacelle was on the ground with some wiring and some melted structure present between the nacelle and the wing. The tops of the wing and tip tank were melted and flames were observed coming out from the melted areas and from the nacelle area. Inspectors at the scene were unable to determine the source of the fire. The airplane records were reviewed and they did not reveal any anomalies. ## Factual narrative On July 16, 1999, at 1800 eastern daylight time, a Cessna 411, N660EM, piloted by an airline transport rated pilot, sustained substantial damage from fire and explosions while the airplane was starting engines at Oakland/Troy Airport, Troy, Michigan. The pilot and passenger reported no injuries. Visual meteorological conditions prevailed at the time of the accident. The 14 CFR Part 91 flight was not on a flight plan. The personal flight to Fort Scott, Kansas was originating at the time of the accident. In a phone interview, the pilot stated that about 145 gallons of 100 low lead fuel was added to the airplane's fuel tanks by the fixed base operator at Troy. He said that he started the left engine first without any problems. He said that he started the right engine next. He said that he heard a loud backfire or explosion after the right engine started. He said that he heard a second loud backfire or explosion. He said that he saw an area, about a one-foot wide, expanded upward. The area was described to be in the middle, top of the right wing, and about three to five feet outboard of the exhaust. He stated that the passenger saw flames coming from the right wing. He said that he shut down both engines. He stated that within 5 to 10 seconds, he saw 2 observers on the ramp area that started to fight the wing fire with their extinguishers. He said that he and his passenger evacuated the airplane. One of the witnesses stated that he heard two explosions and saw that the flames initially came from the underside of the right wing's trailing edge. He described the initial flame as one and a half-foot wide, golden in color, and a surface type flame. He said that as the flames grew, the flames gave off black smoke. He said that he fought the fire with a 50-pound dry chemical type C extinguisher. The responding fire department chief said that a "couple hundred foot" column of black smoke could be seen coming from the wing fire. He stated that the response time was four to five minutes. He said that the twin Cessna was facing north and the wind was coming from the west. He stated that the west winds blew the flames away from the fuselage. He said that the right wing outboard of the engine nacelle was on the ground with some wiring and some melted structure still present between the nacelle and the wing. The tops of the wing and tip tank were melted. The chief said that flames were observed coming out from the melted areas and from the nacelle area. Inspectors at the scene were unable to determine the source of the fire. The airplane records were reviewed and the review did not reveal any anomalies. ## Aircraft - Registration: [N660EM](https://openairdocs.org/deregistered/N660EM-2013-04-30), registration cancelled 2013-04-30, S/N 411-0142, built 1966 (OpenAirDocs) - Reported make and model: Cessna 411 - Registry model: [Cessna 411](https://openairdocs.org/model/cessna-411) (registry code 2075902) (OpenAirDocs) - Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 4110142 - Airframe hours: 2600 - Engines: Continental GTSIO-520-C 340 horsepower reciprocating - Damage: Substantial damage - Fire: On-Ground - Flight: Personal, Part 91 - Registered owner: Robert J. Cullen - Airworthiness certificate: Standard, Normal - Last inspection: 100 hour, June 12, 1999, 25 hours before - Departed: 7D2 - Destination: FSK, FORT SCOTT, KS - Airport: 7D2, Oakland/Troy Airport ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 40; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 5,925 total, 283 in this make and model, 5,460 as pilot in command, 59 in the last 90 days, 23 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 230° at 12 knots, gusting 18 - Visibility: 8 statute miles - Lowest ceiling: none - Temperature: 90 °F, dew point 64 °F - Altimeter: 30.00 inHg - Observed at: PTK, 13 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). - [Accident 19990716009199A](https://openairdocs.org/incident/19990716009199A), Jul 16, 1999: Cessna 411, Troy, MI, Substantial damage. Started left engine normally, then started right engine. Right engine expolded, acft was evacuated. (.19)on July 16, 1999, at 1800 eastern daylight time, a… 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.