# NTSB LAX90LA155: Enstrom F28F, N756H, Corona, CA, April 27, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: April 27, 1990, 12:30 local (19:30 UTC)
- Place: Corona, CA
- Location: 33.8753° N, 117.5664° W: Placed by OpenAirDocs: center of Corona, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=33.8753&lon=-117.5664&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report November 9, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 26785
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX90LA155
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/26785/pdf
- Page: https://openairdocs.org/ntsb/LAX90LA155

## Probable cause

THE PARTIAL FAILURE OF THE ENGINE'S RIGHT MAGNETO, WHICH RESULTED IN A LOSS OF ENGINE POWER.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(partial) - mech failure/malf, descent
  - ignition system,magneto - failure,partial (cause)
- Forced landing, descent - emergency
- In flight collision with terrain/water, descent - emergency
  - terrain condition - soft

## Analysis

THE STUDENT WAS ASSIGNED TO PRACTICE STEEP APPROACH LANDINGS, HOVERING AND QUICK STOPS. AFTER FLYING FOR ABOUT 45 MINUTES, AND WHILE PRACTICING QUICK STOPS, THE HELICOPTER'S ENGINE BEGAN SPUTTERING, COUGHING AND THEN QUIT. THE PILOT MADE AN AUTOROTATIVE DESCENT AND ROLLED OVER FOLLOWING TOUCHDOWN ON SOFT TERRAIN. DURING THE POST-CRASH EXAM OF THE AIRCRAFT THE ENGINE RPM DROP OFF ASSOCIATED WITH OPERATION OF THE LEFT AND RIGHT MAGNETOS WAS NOTED AT 150 AND 400 RPM, RESPECTIVELY.

## Aircraft

- Registration: [N756H](https://openairdocs.org/aircraft/N756H), registered now, S/N 756 (OpenAirDocs)
- Reported make and model: ENSTROM F28F
- Registry model: [Enstrom F-28F](https://openairdocs.org/model/enstrom-f-28f) (registry code 3300412) (OpenAirDocs)
- Registry engine: [Lycoming I0360 SER A&C](https://openairdocs.org/engine/lycoming-i0360-ser-a-c) (registry code 41511, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 756
- Engines: LYCOMING HIO-360-F1AD 225 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: Hiser Helicopters, Inc.

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 35; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; flight hours: 250 total, 22 in this make and model, 150 as pilot in command, 52 in the last 90 days, 22 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 70° at 10 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: -0 °F, dew point -0 °F

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19900427013059A](https://openairdocs.org/incident/19900427013059A), Apr 27, 1990: Enstrm F28F, Corona, CA, Substantial damage. Engine quit on practice autorotations. Landed soft terrain and rolled over. 400 RPM mag drop on post accident test.

## Other investigations on N756H (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 GAA16LA100](https://openairdocs.org/ntsb/GAA16LA100), Jan 13, 2016: Enstrom F-28 (N756H), Ritter Butte, OR, substantial damage. Probable cause: The pilot’s improper fuel management, which resulted in a total loss of engine power due to fuel exhaustion and subsequent impact with terrain.

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.

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