# NTSB LAX90LA339: Waco YMS, N40115, Kailua, HI, September 28, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 28, 1990, 10:45 local (20:45 UTC)
- Place: Kailua, HI
- Coordinates: 19.629434, -155.990051 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=19.6294&lon=-155.9901&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report November 23, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 26934
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX90LA339
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/26934/pdf
- Page: https://openairdocs.org/ntsb/LAX90LA339

## Probable cause

IMPROPER USE OF CARBURETOR HEAT RESULTING IN ENGINE FAILURE DUE TO CARBURETOR ICING.

## Sequence of events

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

- Loss of engine power(total) - nonmechanical, maneuvering
  - weather condition - carburetor icing conditions (contributing factor)
  - carburetor heat - improper use of, pilot in command (cause)
- Forced landing, descent - emergency
- On ground/water encounter with terrain/water, landing - roll
  - terrain condition - rough/uneven (contributing factor)

## Analysis

THE PILOT OF A WACO YMF, N40115, STATED AFTER COMPLETING SEVERAL AEROBATIC MANEUVERS EVERYTHING WAS NORMAL. THE PILOT STATED HE ENTERED ANOTHER LOOP AT 3500 FEET. HE STATED HE ADDED FULL POWER ON THE UP SIDE AND REDUCED POWER TO IDLE ON THE DOWN SIDE. HE STATED AS HE STARTED TO ROUND OUT AT THE BOTTOM OF THE LOOP HE ADDED POWER AND THERE WAS NO RESPONSE. THE TEMPERATURE/DEW POINT SPREAD WAS FOUND TO BE IN 'SERIOUS ICING-GLIDE' RANGE.

## Aircraft

- Registration: [N40115](https://openairdocs.org/deregistered/N40115-2015-05-04), registration cancelled 2015-05-04, S/N F5-023, built 1989 (OpenAirDocs)
- Reported make and model: WACO YMS
- Registry model: [Classic WACO YMF](https://openairdocs.org/model/classic-waco-ymf) (registry code 2240101) (OpenAirDocs)
- Registry engine: [Jacobs R755B series](https://openairdocs.org/engine/jacobs-r755b-series) (registry code 35007, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 5023
- Engines: JACOBS R755-B2 275 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Kegel, Gary
- Registered owner: Unknown
- Departed: KOA, KEAHOLE APT., HI
- Destination: KOA

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 44; airline transport, flight instructor; airplane ratings: single-engine land, multi-engine sea, single-engine sea, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; flight hours: 14,652 total, 135 in this make and model, 14,084 as pilot in command, 180 in the last 90 days, 69 in the last 30 days, 3 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 5 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: -0 °F, dew point -0 °F
- Observed at: KOA, 10 nm away

## 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 19900928043929A](https://openairdocs.org/incident/19900928043929A), Sep 28, 1990: Waco YMF, Kailua Kona, HI, Substantial damage. During power reduction on downside of loop engine failed to respond. Crashed landed. Carb ice factor.

## Other investigations on N40115 (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 LAX96LA092](https://openairdocs.org/ntsb/LAX96LA092), Dec 29, 1995: Classic Waco YMF (N40115), Kailua Kona, HI, substantial damage. Probable cause: The failure of the Waco pilot to see and avoid the opposite direction Cessna 172 while both aircraft were taxiing in a non-movement area of the airport. Factors in the accident were: the congested…

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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