ASN Wikibase Occurrence # 245987
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| Date: | Thursday 10 April 1958 |
| Time: | 11:00 |
| Type: |  Sikorsky S-58C |
| Owner/operator: | SABENA |
| Registration: | OO-SHO |
| MSN: | 58-432 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Brussels City Heliport (Groendreef/Allée Verte) -
 Belgium
|
| Phase: | Take off |
| Nature: | Cargo |
| Departure airport: | |
| Investigating agency: | AAIU Belgium |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
Aircraft was tasked with a postal flight, carrying one pilot and a quantity of mail. The aircraft was parked in position 3 at the city helicopter terminal, parked in between two other helicopters. After starting up the aircraft, the pilot unlocked the tail wheel in order to maneuver to the helipad.
As the helicopter started moving, the pilot observed that it started 'dancing around' with increasingly stronger motions. Hoping to stop the movements he held the cyclic fully down, however this only seemed to increase the movements. Fearing a collision with either of the other two helicopters on the platform, the pilot then decided to take off, hoping that the movements would subside once airborne.
After becoming airborne, the oscillations continued just as strongly, up to the point the pilot lost control and the aircraft started descending. The aircraft then hit the ground, after which the pilot cut fuel and all switches.
The aircraft sustained substantial damage in the accident, its left landing gear collapsing, and causing it to come to rest on its left side, with additional damage to the fuselage and rear stabiliser. The fuel cell was pierced. The main rotor blades were all damaged, as was the rotor mast.
CAUSE OF THE ACCIDENT.
The accident was caused by the phenomenon known as the name "Ground Resonance".
Accident investigation:
 |
|
Sources:
AAIU Belgium
https://www.helispot.be/hs/documents/ongevallen/oo-sho.pdf
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Jul-2023 19:47 | Anon | Updated |
| 15-Jul-2023 19:47 | harro | Updated |
Corrections or additions? ... Edit this accident description
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