# NTSB DEN90LA097: Avions Mudry CAP10B, N64UV, Grand Forks, ND, April 21, 1990

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: April 21, 1990, 10:58 local (15:58 UTC)
- Place: Grand Forks, ND
- Coordinates: 46.93085, -96.829742 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=46.9308&lon=-96.8297&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor
- Status: Completed, report September 28, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 17922
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN90LA097
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/17922/pdf
- Page: https://openairdocs.org/ntsb/DEN90LA097

## Probable cause

AN OVER TEMPERATURE OF THE INLET FUEL LINE RESULTING IN FUEL STARVATION (VAPOR LOCK) IN THE FUEL INJECTION SYSTEM. A FACTOR IN THE ACCIDENT WAS THE LACK OF A SUITABLE LANDING AREA.

## Sequence of events

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

- Loss of engine power(total) - nonmechanical, approach - vfr pattern - final approach
  - fuel system,line - overtemperature (cause)
- Forced landing, descent - emergency
- Nose over, landing - roll
  - terrain condition - none suitable (contributing factor)

## Analysis

N64UV SUSTAINED SUBSTANTIAL DAMAGE DURING AN EMERGENCY LANDING, IN A FIELD NEAR THE GRAND FORKS INTERNATIONAL AIRPORT, NORTH DAKOTA. DURING FINAL APPROACH TO LANDING, THE AIRCRAFT ENGINE SUDDENLY STOPPED. THE INSTRUCTOR TOOK OVER THE CONTROLS. HE SAID THE ENGINE DID NOT RESTART AND HE WAS FORCED TO LAND ON AN UNSUITABLE LANDING SURFACE. DURING THE LANDING ROLL THE AIRCRAFT NOSED OVER. INSPECTION OF THE ENGINE INDICATED THAT THE POER LOSS WAS DUE TO VAPOR LOCK IN THE INLET FUEL LINE TO THE ELECTRIC BOOST PUMP. SUBSEQUENT ENGINE TEST RUN WAS SUCCESSFUL.

## Aircraft

- Registration: N64UV (not matched to a registry record)
- Reported make and model: Avions Mudry CAP10B
- Category: Airplane
- Serial number: 175
- Airframe hours: 1037
- Engines: LYCOMING IO-360-B2F 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: University Of North Dakota
- Registered owner: University Of North Dakota
- Airworthiness certificate: Standard, Aerobatic
- Last inspection: 100 hour, April 19, 1990, 4 hours before
- Destination: GFK
- Airport: GFK, Mark Andrews Grand Forks

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 40; flight instructor, commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: right; flight hours: 1,010 total, 470 in this make and model, 793 as pilot in command, 110 in the last 90 days, 69 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 190° at 16 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 73 °F, dew point 34 °F
- Altimeter: 30.00 inHg
- Observed at: GFK, 1 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 19900421010529A](https://openairdocs.org/incident/19900421010529A), Apr 21, 1990: Mudry CAP10B, Grand Forks, ND, Substantial damage. Completed aerobatic dual throttle for landing,engine quit,too low for restart. Type fuel system vapor locks at idle

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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