ASN Wikibase Occurrence # 73894
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| Date: | Thursday 8 April 2010 |
| Time: | 12:58 |
| Type: | TeamRocket F1 Rocket (built by Van E. Snow) |
| Owner/operator: | Snow Van E |
| Registration: | N28VS |
| MSN: | 001 |
| Total airframe hrs: | 191 hours |
| Engine model: | Experimental IO-540 |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Near Borrego Valley Airport (KL08), California -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Private |
| Departure airport: | Borrego Springs, CA |
| Borrego Springs, CA (L08) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was practicing aerobatics in preparation for a local aerobatic competition. A witness on the ground observed the pilot's practice sessions as well as monitored his radio communications. The pilot flew into the designated aerobatic box and performed an aerobatic sequence twice. The pilot then performed a spin maneuver and departed the aerobatic box. The witness recalled that the pilot was requested to repeat a maneuver and reentered the aerobatic box at an altitude between 2,700 and 3,000 feet above ground level (agl). The airplane entered a 30- to 35-degree nose-down descent angle to begin his sequence. Shortly thereafter, the pilot made a radio transmission in the blind saying "I have no back stick." The witness estimated that the airplane was descending through about 1,800 to 2,000 feet agl when the witness heard someone ask the pilot if the airplane was under control. The pilot responded that it was not. A few seconds later, the witness heard another transmission telling the pilot to use the airplane’s trim; the pilot responded that "there is no trim" as the airplane was observed descending through about 600 feet agl. No further radio transmissions were heard from the pilot and the airplane continued to steepen its descent angle just before ground impact.
A postaccident examination revealed that the elevator flight control system exhibited numerous areas of separations consistent with overload from the rear control stick to the elevator control surface. The front and rear control sticks were found separated from their control columns. The interconnected control column, portions of the separated front and rear control sticks, elevator control servo, and portions of control rod were found to be fractured due to overstress. Examination of the front control stick revealed that it was fractured in overstress due to cantilever bending just above the control column fitting; the fracture initiated at a 0.22-inch diameter hole drilled into the front wall of the stick tube. The upper portion of the front control stick was not located. The chemical composition and hardness of the front and rear control sticks were within specifications.
Probable Cause: The pilot's inability to maintain control due to the in-flight failure and separation of the pilot's flight control stick. The reason for the flight control stick failure could not be determined.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Apr-2010 21:22 | slowkid | Added |
| 09-Apr-2010 22:08 | RobertMB | Updated [Time, Aircraft type, Operator, Location, Phase, Departure airport, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 26-Nov-2017 16:35 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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