Colgan Air Flight 9446
Colgan Air Flight 9446 was a repositioning flight operated by Colgan Air for US Airways Express. On August 26, 2003 a Beech 1900D crashed into water 100 yards offshore from Yarmouth, Massachusetts, United States shortly after taking off from Barnstable Municipal Airport in Yarmouth.[1] Both pilots were killed.[3][4][5]:85
 A Colgan Air Beechcraft 1900D, similar to the aircraft involved in the accident | |
| Accident | |
|---|---|
| Date | August 26, 2003 |
| Summary | Maintenance and pilot errors[1][2] |
| Site | Yarmouth, Massachusetts 41°37′N 70°15′W |
| Aircraft | |
| Aircraft type | Beechcraft 1900D |
| Operator | Colgan Air |
| Registration | N240CJ |
| Flight origin | Barnstable Municipal Airport, Yarmouth, Massachusetts |
| Destination | Albany International Airport, Albany, New York |
| Occupants | 2 |
| Crew | 2 |
| Fatalities | 2 |
| Survivors | 0 |
Aircraft and crew
Flight 9446 was an unscheduled deadhead flight of a Beechcraft 1900D (registration N240CJ[6]).[3][7] The aircraft had just finished receiving maintenance in Yarmouth, Massachusetts, and was being repositioned to Albany, New York to return to revenue service.[1][7] The two occupants of the plane were its pilots, Captain Scott Knabe and First Officer Steven Dean.[5]
Accident
Flight 9446 departed Barnstable Municipal Airport on August 26, 2003 at 15:40 eastern daylight time.[2] Shortly after takeoff, Flight 9446 declared an emergency and reported a trim problem. The aircraft entered into a left turn and reached an altitude of 1,100 feet. The pilots requested a return to Barnstable, and air traffic control cleared the flight to land on any runway.[3][5]:86 The airplane continued its left turn in a nose-up attitude, and then pitched down and crashed into water near the airport.[3]
Investigation and aftermath
The National Transportation Safety Board (NTSB) investigated the accident.[8]
The NTSB determined that Flight 9446 was the first flight after maintenance personnel replaced the forward elevator trim cable. The maintenance personnel had skipped a step in the maintenance process. In addition, the aircraft maintenance manual depicted the elevator trim drum backwards.[8][1] As a result, the trim system was configured in a manner that caused the trim tabs in the cockpit to move in the correct direction, but the actual trim wheel (which controlled the flight control surfaces) moved in the opposite direction.[8]
The NTSB also determined that the pilots did not notice the maintenance error because the captain failed to perform a preflight checklist, which included an elevator trim check. The pilots manually set nose-up trim prior to departure, but because of the improper maintenance, this actually set the elevator trim to the full nose-down position.[8]
The NTSB determined that it would have taken 250 pounds of force on the control yoke for the pilots to keep the plane airborne, making a safe landing nearly impossible. Investigators programmed a flight simulator with the improper trim settings and made six simulated flights. Five attempts resulted in crashes shortly after takeoff; in one attempt, the simulator pilot was able to circle for a landing, but impacted terrain while attempting to land.[1]
The NTSB published its findings and determination of probable cause on August 31, 2004. The NTSB determined that the probable causes of the accident were the maintenance crew's improper replacement of the forward elevator trim cable, and subsequent inadequate functional check of the maintenance performed. The NTSB identified the flightcrew's failure to follow the checklist procedures, and the aircraft manufacturer's erroneous depiction of the elevator trim drum in the maintenance manual, as contributing to the accident.[8]
After the NTSB's final report was published, Aero News Network observed that Beechcraft 1900D maintenance manuals were considered as accident factors in two previous fatal accidents. However, Raytheon (owner of Beechcraft) denied blame for the crash of Flight 9446, and a company spokesman said the accident would not have happened without the Colgan Air maintenance crew's mistakes.[1]
References
- "Errors Piled Up To Doom Colgan Cape Cod Flight". aero-news.net. September 2, 2004. Retrieved December 23, 2017.
- "Full narrative (Colgan Air Flight 9446)". National Transportation Safety Board. August 31, 2004. NYC03MA183. Retrieved December 23, 2017.
- "Update on NTSB Investigations into Recent Beech 1900D Accidents and Incidents". National Transportation Safety Board. November 21, 2003. Retrieved December 23, 2017.
- Gouveia, Aaron. "Buffalo crash airline had Cape crash in 2003 Archived February 22, 2012, at the Wayback Machine." Cape Cod Times. February 13, 2009. Retrieved on February 13, 2009.
- Aircraft Accident Report, Loss of Pitch Control During Takeoff, Air Midwest Flight 5481, Raytheon (Beechcraft) 1900D, N233YV, Charlotte, North Carolina, January 8, 2003 (PDF). National Transportation Safety Board. NTSB/AAR-04/01. Archived from the original (PDF) on June 28, 2014.
- "FAA Registry (N240CJ)". Federal Aviation Administration.
- Babineck, Mark; Hensel, Bill Jr. (February 13, 2009). "Records show Colgan flights had been fatality free". Houston Chronicle. Retrieved December 23, 2017.
- "Aircraft accident report (Colgan Air Flight 9446)". National Transportation Safety Board. August 31, 2004. NYC03MA183. Retrieved December 23, 2017.
