Enstrom F-28-F N99YC
25 June 1997 · Riverside, California, United States · Minor injuries
Summary
On 25 June 1997 at about 19:43 local time, a Enstrom F-28-F registered N99YC, operated by Stits Aircraft, was involved in an accident near Riverside, California, United States. 3 people were on board and 3 had minor injuries. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.
The record
- Date
- at 19:43
- Classification
- Accident
- Location
- Riverside, California, United States
- Nearest airport
- Riverside Municipal (RAL)
- Coordinates
- 33.9000, -117.4003
- Aircraft
- Enstrom F-28-F
- Registration
- N99YC
- Category
- Helicopter
- Engines
- 1
- Operator
- Stits Aircraft
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Personal
- Phase of flight
- Not recorded
- Route
- Unknown → Corona
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- LAX97LA224
People
3 people had minor injuries.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 3 | 0 | 0 | 3 | 0 |
Probable cause
failure by unknown maintenance personnel to retorque the nuts on the retainer cover.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
During takeoff, the helicopter lost power and landed hard. Postaccident examination revealed the No. 2 cylinder intake valve rocker shaft migrated out of the shaft bosses of the cylinder head. The shaft, cover, and nuts were found; the washers were not. According to owner/pilot there were internal star washer imprints on the cover plate commonly caused by torque or tightening of the nut. The helicopter had 61.5 total hours since new, and received one 50-hour inspection since delivery to the owner/pilot. The owner/pilot changed the oil and filter just prior to the inspection.
Quoted verbatim from the NTSB record.
Other Enstrom F-28 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 12 Jun 1999 | Enstrom F-28 | Cincinnati, Ohio, United States | - | Minor injuries | - |
| 11 Aug 1982 | Enstrom F-28 | Waynesville, Ohio, United States | Hilty Farms, Inc. | No injuries | - |
| 26 Dec 1980 | Enstrom F-28-C | Eureka, California, United States | - | No injuries | - |
| 13 Jul 1980 | Enstrom F-28 | Xenia, Ohio, United States | Cincinnati Air | No injuries | - |
| 19 Jun 1980 | Enstrom F-28-C | Talkeetna, Alaska, United States | Alyeska Air SE | No injuries | - |
| 16 May 1979 | Enstrom F-28-C | Shelbyville, Kentucky, United States | - | No injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 24 Aug 1997 | Airbus A300 B4-203 | Los Angeles, California, United States | Pan American World Airways, In | No injuries | - |
| 15 Aug 1997 | Bell UH-1H | Tahoe City, California, United States | Usda / Forest Service | Minor injuries | - |
| 11 Oct 1997 | Cessna 152 | Julian, California, United States | Plus One Flyers, Inc. | Fatal | 1 |
| 11 Oct 1997 | Schweizer 2-32 | Warner Springs, California, United States | - | Fatal | 1 |
| 12 Oct 1997 | Bellanca 7ECA | Tracy, California, United States | - | Fatal | 1 |
| 26 Oct 1997 | Extra Flugzeugbau EA-300 | Castaic, California, United States | - | Fatal | 2 |