ASN Wikibase Occurrence # 133196
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| Date: | Wednesday 25 May 1994 |
| Time: | 19:30 LT |
| Type: |  Hughes 269B |
| Owner/operator: | Dwain Webster |
| Registration: | N9375S |
| MSN: | 54-0091 |
| Year of manufacture: | 1964 |
| Total airframe hrs: | 3669 hours |
| Engine model: | Lycoming HIO-360-A1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Toulon, IL -
 United States of America
|
| Phase: | Take off |
| Nature: | Unknown |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE HELICOPTER HAD BEEN REASSEMBLED AFTER AN ANNUAL INSPECTION, WITH INSTALLATION OF 3 OVERHAULED MAIN ROTOR BLADES. THE MAIN ROTOR BLADE DAMPERS HAD BEEN DISASSEMBLED, INSPECTED AND REASSEMBLED. DURING REASSEMBLY, THE INTERNAL SEQUENCE OF FRICTION DISCS WAS INCORRECT, RESULTING IN IMPROPER AND NON- UNIFORM DAMPING ACTION BETWEEN THE BLADES. THE SHOCK STRUT OLEOS WERE NOT SERVICED. POST ACCIDENT INSPECTION REVEALED LOW PRESSURE IN THE 3 REMAINING INTACT STRUTS. DURING THE FIRST TAKEOFF AFTER REASSEMBLY TO TRACK THE MAIN ROTOR BLADES IN A HOVER, THE HELICOPTER ENCOUNTERED GROUND RESONANCE AND WAS DESTROYED.
Probable Cause: the improper reassembly of the main rotor blade dampers and the underservicing of the landing gear skid hydraulic struts which resulted in ground resonance of the helicopter when the first takeoff after reassembly was attempted.
Accident investigation:
 |
|
Sources:
NTSB CHI94LA175
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 10-Apr-2024 07:16 | ASN Update Bot | Updated [Time, Other fatalities, Source, Narrative, Category, Accident report] |
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