ASN Wikibase Occurrence # 294612
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| Date: | Monday 23 August 2004 |
| Time: | 09:50 LT |
| Type: |  Enstrom F-28A |
| Owner/operator: | P |
| Registration: | N9573 |
| MSN: | 131 |
| Year of manufacture: | 1972 |
| Engine model: | Lycoming HIO-360-CIA |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Leroy, Minnesota -
 United States of America
|
| Phase: | Unknown |
| Nature: | Survey |
| Departure airport: | Leroy, MN |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter sustained substantial damage when it impacted terrain and rolled over after a loss of engine power during takeoff. The pilot reported that the engine was producing 3,000 rpm's when he brought the helicopter into a hover. He transitioned into forward flight and cleared a fence, and then the engine lost power. He reported that he thought that an exhaust valve was stuck. He attempted to do a run on landing to a field. The helicopter touched down on its left skid two times but the helicopter was not straight. He reported that the third time the helicopter touched down on its left skid, the helicopter was not straight and the rpm's were low. He reported that he ran out of tail rotor authority. The helicopter rolled over on its left side. The engine was inspected and an engine run was conducted. The engine was run at 1,800 to 2,000 rpm, and then at 1,110 to 1,200 rpm; but the engine popped and ran unevenly. A re-inspection of the engine revealed that the 1/8-27 NPT Allen plug to the number four cylinder was missing. Once the hole was plugged, the engine ran smoothly.
Probable Cause: The partial loss of engine power due to the missing 1/8-27 NPT Allen plug as a result of other maintenance personnel undertorquing the plug. Additionally, the pilot improperly excecuted a run on landing. A factor was the loss of tail rotor effectiveness.
Accident investigation:
 |
|
Sources:
NTSB CHI04CA237
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Oct-2022 06:58 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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