Beechcraft A60 N457DA
9 November 1999 · Boulder, Colorado, United States · No injuries
Summary
On 9 November 1999 at about 18:00 local time, a Beechcraft A60 registered N457DA was involved in an incident near Boulder, Colorado, United States. One person was on board and nobody was injured. The aircraft was slightly damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.
The record
- Date
- at 18:00
- Classification
- Incident
- Location
- Boulder, Colorado, United States
- Nearest airport
- Boulder Municipal Airport (1V5)
- Coordinates
- 40.0194, -105.2498
- Aircraft
- Beechcraft A60
- Registration
- N457DA
- Category
- Airplane
- Engines
- 2
- Operator
- Not recorded
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Public Use
- Phase of flight
- Not recorded
- Route
- Englewood → Unknown
- Aircraft damage
- Minor
- Weather
- VMC
- Light
- Day
- NTSB number
- DEN00IA075
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 1 |
Probable cause
The fatigue failure of the #6 cylinder connecting rod cap.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
The pilot said that as he descended to 6,500 feet mean sea level, the left engine of the twin-engine airplane failed. The pilot landed the airplane without further incident. The engine had 23.5 hours on it since major overhaul. An engine teardown revealed that the #6 connecting rod had failed. Examination of the #6 cylinder parts found preexisting fractures on both the rod cap and the connecting rod. The fatigue features displayed on the rod cap are suggestive of lower stress propagation than those stress propagation marks on the connecting rod. It appeared that the engine failure-initiating event was the failure of the rod cap. Examination of the #6 connecting rod bolts indicated that they fractured as a result of overstress.
Quoted verbatim from the NTSB record.
Other Beechcraft A60 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 8 Apr 2000 | Beechcraft A60 | Englewood, Colorado, United States | - | No injuries | - |
| 24 Oct 2002 | Beechcraft A60 | Jesup, Georgia, United States | J. P. R. Comeault | Fatal | 2 |
| 6 Jan 1995 | Beechcraft A60 | Hurley, New Mexico, United States | - | Fatal | 3 |
| 15 May 2004 | Beechcraft A60 | Gualala, California, United States | Richard L. Probert | No injuries | - |
| 21 Nov 1992 | Beechcraft A60 | Snoqualmie Pass, Washington, United States | Huber, James D. | Fatal | 6 |
| 11 Mar 1989 | Beechcraft A60 | Manassas, Virginia, United States | RTS Service Inc. | Fatal | 5 |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 28 Apr 1999 | Weatherly 201-C | Two Buttes, Colorado, United States | - | No injuries | - |
| 11 Aug 1999 | Air Tractor AT-402A | Mead, Colorado, United States | - | No injuries | - |
| 25 Mar 1999 | Robinson R22 BETA | Englewood, Colorado, United States | - | No injuries | - |
| 28 Mar 1999 | Cameron V-77 | Elbert, Colorado, United States | - | Serious injuries | - |
| 16 Aug 1999 | Piper PA-32-260 | Aspen, Colorado, United States | - | Minor injuries | - |
| 25 Dec 1999 | Luscombe 8E | San Luis, Colorado, United States | - | Serious injuries | - |