ASN Wikibase Occurrence # 76098
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| Date: | Sunday 29 November 1998 |
| Time: | 19:56 LT |
| Type: |  McDonnell Douglas MD 900 Explorer |
| Owner/operator: | Idaho Helicopters, Inc. |
| Registration: | N977LF |
| MSN: | 900-00027 |
| Year of manufacture: | 1995 |
| Total airframe hrs: | 1752 hours |
| Engine model: | P&W 206A |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Idaho City, ID -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | |
| Boise, ID (U56) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The McDonnell Douglas MD-900 medevac helicopter was dispatched to a car accident at a site characterized by high terrain and high trees. Prior to landing, the pilot requested information about wires and was advised by ground personnel that 'there were none.' Subsequent to landing, the pilot examined the landing site and proposed departure route for wires, and reportedly observed none. The departure from the site was conducted under dusk to dark night conditions. While climbing out vertically due to the narrow canyon conditions at the site, the helicopter struck unmarked transmission lines approximately 150 feet above ground. The pilot then determined that the helicopter was controllable and displayed no unusual flight characteristics, and chose to proceed to his destination. Post-flight examination revealed crazing of the windscreen and damage to four of the five main rotor blades requiring major repair/replacement.
Probable Cause: The pilot-in-command's not obtaining/maintaining clearance with the unmarked transmission lines. Contributing factors were environmental (dusk) conditions, the transmission lines, and both the pilot-in-command and the ground personnel not identifying the existence of the hazardous condition (high wires).
Accident investigation:
 |
|
Sources:
NTSB SEA99LA016
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Aug-2010 03:33 | Alpine Flight | Added |
| 27-Feb-2013 03:11 | TB | Updated [Aircraft type, Operator, Source] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 04-Apr-2024 12:53 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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