# NTSB MIA90LA111: Hiller UH-12B, N5306V, Sanford, FL, April 26, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: April 26, 1990, 09:34 local (13:34 UTC)
- Place: Sanford, FL
- Location: 28.7772° N, 81.2349° W: Placed by OpenAirDocs at ORLANDO SANFORD INTL (SFB), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=28.7772&lon=-81.2349&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report September 5, 1991
- Report: Approved by Office Director
- NTSB case key (mKey): 32649
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA90LA111
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/32649/pdf
- Page: https://openairdocs.org/ntsb/MIA90LA111

## Probable cause

LOSS OF ENGINE POWER FOR AN UNKNOWN REASON.

## Sequence of events

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

- Loss of engine power, takeoff - initial climb
  - reason for occurrence undetermined (cause)
- Forced landing, descent - emergency
  - autorotation - performed, pilot in command
- In flight collision with terrain/water, landing - flare/touchdown
- Roll over, landing

## Analysis

THE STUDENT PLT WAS ON A SOLO FLT, PRACTICING TRAFFIC PATTERN APPROACHES.  HE STATED THAT AFTER TAKING OFF FROM HIS 4TH APCH, THE ENG LOST POWER & THE HELICOPTER YAWED TO THE LEFT. HE INITIATED AN AUTOROTATION, BUT THE HELICOPTER STRUCK THE GROUND & ROLLED OVER. AN OPERATIONAL CHECK OF THE ENG REVEALED NO REASON FOR THE RPRTD LOSS OF POWER.

## Aircraft

- Registration: [N5306V](https://openairdocs.org/aircraft/N5306V), registered now, S/N 632 (OpenAirDocs)
- Reported make and model: HILLER UH-12B
- Registry model: [Hiller UH-12B](https://openairdocs.org/model/hiller-uh-12b) (registry code 4360110) (OpenAirDocs)
- Registry engine: [Franklin 6V4 series](https://openairdocs.org/engine/franklin-6v4-series) (registry code 27033, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 632
- Engines: FRANKLIN 6V-335-B 210 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Registered owner: Unknown
- Airport: SFB, Sanford Rgnl

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 38; student; medical: class 3, valid medical--no waivers/lim.; flight hours: 21 total, 10 in this make and model, 2 as pilot in command, 21 in the last 90 days, 10 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 120° at 8 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: -0 °F, dew point -0 °F
- Observed at: SFB

## 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 19900426011809A](https://openairdocs.org/incident/19900426011809A), Apr 26, 1990: Hiller UH12B, Sanford, FL, Substantial damage. Student lost control shortly after lift off,descended,hit ground and rolled over. Blamed engine. No defects found.

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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