ASN Wikibase Occurrence # 352338
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| Date: | Wednesday 17 November 1999 |
| Time: | 13:10 LT |
| Type: |  Bell 206L-3 |
| Owner/operator: | Aero-Copters, Inc. |
| Registration: | N206AC |
| MSN: | 51545 |
| Year of manufacture: | 1991 |
| Total airframe hrs: | 10969 hours |
| Engine model: | Allison 250-C30 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Seattle, WA -
 United States of America
|
| Phase: | En route |
| Nature: | Executive |
| Departure airport: | Seattle-Boeing Field International Airport, WA (BFI/KBFI) |
| Vancouver, BC | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A Bell 206L-3, N206AC, registered to and operated by Aero-Copters, Inc., and a Bell 206B, N5735A, registered to WPXI, Inc. and operated by KIRO Television collided in mid-air about seven miles north of Boeing Field Airport, Seattle, Washington. Visual meteorological conditions prevailed.
Both aircraft received substantial damage. The pilot of N5735A sustained minor injuries, and his passenger was uninjured. The pilot, the sole occupant of N206AC, was not injured.
N206AC departed Boeing Field approximately five minutes prior to the accident with a planned destination of Vancouver,
British Columbia, Canada. N5735A departed Boeing Field approximately 36 minutes prior to the accident for a local electronic news gathering flight.
The pilot of N5735A reported that he was transitioning the area of Lake Union (on a local electronic news gathering flight) in a south-southwesterly direction when the two aircraft collided. He stated that he simultaneously saw the other aircraft and felt the impact. After the collision, the pilot initiated a descent and landed on a nearby helipad. The pilot reported that prior to the collision he was monitoring the common traffic advisory frequency (CTAF) for Lake Union (122.90). He stated that just before transitioning the area he reported his position, altitude and heading on 122.90. The pilot of N206AC reported that he departed Boeing Field and was proceeding northbound. He stated that he had just cleared Boeing's Delta airspace and switched to Seattle Radio (122.50) when he '...experienced a loud bang and vibration in the main rotor system'. The pilot initiated a descent to a nearby helipad, and was able to land without further incident. The pilot stated he did not see the other aircraft before, or after the collision. There were no reported mechanical failures or malfunctions that may of contributed to the accident. A calculated convergence angle between the two aircraft indicated that there were no visual restrictions that would have prevented the pilot from seeing the other aircraft
Probable Cause: Adequate separation and lookout not maintained by the pilots of both aircraft.
Accident investigation:
 |
|
Sources:
NTSB SEA00FA021
History of this aircraft
Other occurrences involving this aircraft
| 13 August 2004 | C-GYHX | Yellowhead Helicopters | 0 | Valemount, British Columbia |  |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Mar-2024 11:01 | ASN Update Bot | Added |
| 07-Mar-2024 11:13 | ASN | Updated [Cn, Operator, Departure airport, Destination airport, Narrative] |
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