# Accident 19880630027299A: Helio HST550A, Perris, CA, June 30, 1988

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: June 30, 1988, 13:00 local time
- Place: Perris, CA
- Damage: Destroyed
- Phase of flight: Descent
- Operating rules: General operating rules (Part 91)
- Location: 33.7825° N, 117.2286° W: Placed by OpenAirDocs: center of Perris, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=33.7825&lon=-117.2286&mi=10
- Aircraft: N9991F, a cancelled registration (https://openairdocs.org/deregistered/N9991F-1988-08-26) (OpenAirDocs)
- Registry model: Helio HST-550A (registry code 4301006, https://openairdocs.org/model/helio-hst-550a) (OpenAirDocs)
- Reported make and model: HELIO HST550A
- Reported engine: PWA PT6A27
- People aboard: 1
- Fatal injuries: 1
- Pilot flight hours: 4,500 total
- NTSB investigation: [NTSB LAX88FA241](https://openairdocs.org/ntsb/LAX88FA241) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19880630027299A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

PITCH TRIM IN FULL DOWN POSITION AFTER DROPPING SKYDIVERS. NO TIME TO PARACHUTE.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB LAX88FA241](https://openairdocs.org/ntsb/LAX88FA241), Jun 30, 1988: Helio HST-550A (N9991F), Perris, CA, destroyed, 1 fatal. Probable cause: FAILURE OF THE ELECTRICAL STABILIZER TRIM CONTROL THAT RESULTED IN AN UNCOMMANDED FULL NOSE DOWN ELEVATOR TRIM COMMAND.

## Other reports on N9991F (1)

Matched to the same aircraft by N-number and date.

- [Incident 19870821062539I](https://openairdocs.org/incident/19870821062539I), Aug 21, 1987: Helio HST550A (N9991F), Davis, CA, 1 fatal. Main chute failed to open after free fall. Reserve deployed too late. Chutist impacted the ground.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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