ASN Wikibase Occurrence # 289040
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| Date: | Friday 29 July 2011 |
| Time: | 15:30 LT |
| Type: |  Schweizer 269C |
| Owner/operator: | Cvc Helicopter Service |
| Registration: | N39SH |
| MSN: | S1287 |
| Year of manufacture: | 1987 |
| Total airframe hrs: | 2907 hours |
| Engine model: | Lycoming HIO-360 SER |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Darlington, Maryland -
 United States of America
|
| Phase: | Standing |
| Nature: | Ferry/positioning |
| Departure airport: | Bel Air, MD (NA ) |
| Darlington, MD (NA ) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot of the helicopter stated that he conducted a light touchdown on the helipad and reduced engine power and applied collective friction for cooldown, per the helicopter's checklist. About 1 minute after the touchdown, the helicopter began to vibrate violently. The pilot further reduced engine power, but the helicopter continued to vibrate until it fell apart. Before the day's flights, the pilot performed a preflight inspection of the helicopter, during which he visually inspected both forward and aft landing gear dampers and also squeezed them to confirm that they contained oil and were not leaking. He did not observe any anomalies during this inspection. The landing gear dampers were examined by the manufacturer after the accident, and during load testing three of the four dampers did not meet required specifications. The minority owner of the helicopter stated that, based on the helicopter's fuel consumption during the time since its last inspection, he believed that the helicopter was more than 50 hours overdue for a 100-hour inspection. He also stated that, on one occasion, he found the helicopter's Hobbs meter disconnected. The helicopter manufacturer's maintenance instructions state that, "Incorrect fluid levels, improper pressure or inoperable valving will deteriorate the damping capabilities of the landing gear dampers. These conditions may result in ground resonance and destruction of the helicopter.â€
Probable Cause: Inadequate maintenance of the helicopter's landing gear dampers, which resulted in a main rotor out-of-balance condition and ground resonance encounter.
Accident investigation:
 |
|
Sources:
NTSB ERA11LA428
History of this aircraft
Other occurrences involving this aircraft
| 2 August 1989 | N75044 | Atlantic Leasing Ser.,inc. | 0 | Philadelphia, PA | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-Oct-2022 09:06 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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