# NTSB DEN87DTM01: Evans VP-2, N84772, Cedar Valley, UT, September 18, 1987

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Final report
- Date: September 18, 1987, 15:15 local (21:15 UTC)
- Place: Cedar Valley, UT
- Coordinates: 40.540458, -110.729446 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.5405&lon=-110.7294&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Completed, report October 6, 1988
- Report: Approved by Office Director
- NTSB case key (mKey): 17073
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN87DTM01
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/17073/pdf
- Page: https://openairdocs.org/ntsb/DEN87DTM01

## Sequence of events

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

- Airframe/component/system failure/malfunction, takeoff - initial climb
  - flt control syst,aileron control - binding(mechanical) (cause)
  - aileron - improper, manufacturer (cause)
  - maintenance,inspection - inadequate, pilot in command (cause)
  - operation with known deficiencies in equipment - initiated, pilot in command (cause)
- Loss of control - in flight, descent - uncontrolled
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

THE ACFT WAS FLOWN BY TWO DIFFERENT PLTS WHO COMPLAINED OF STIFF AILERONS. THE AILERON SYSTEM WAS EXAMINED BUT NO DEFICIENCIES WERE NOTED. A THIRD PLT THEN TOOK OFF AND BEGAN A LT TURN AT ABOUT 75 TO 100 FT AGL. WHEN HE ATTEMPTED TO RETURN TO WINGS LEVEL HE WAS UNABLE TO ROLL TO THE RT. THE LT BANK THEN INCREASED AND THE ACFT COLLIDED WITH THE GROUND IN A LT WING LOW, NOSE LOW ATTITUDE AND CARTWHEELED. EXAMINATION OF THE INBOARD AILERON PULLEY BLOCK ON THE LT WING REVEALED THAT ADHESIVE USED TO AFFIX THE BLOCK TO THE SUPPORTING STRUCTURE HAD SEEPED DOWN TO THE OUTSIDE OF THE PULLEY AND FORMED A BOND BETWEEN THE PULLEY AND THE STRUCTURE. THE PULLEY ALSO HAD A GROOVE WORN IN THE PULLEY CHANNEL CONSISTENT WITH LACK OF PULLEY ROTATION.

## Aircraft

- Registration: [N84772](https://openairdocs.org/deregistered/N84772-1991-06-25), registration cancelled 1991-06-25, S/N 3156 (OpenAirDocs)
- Reported make and model: Evans Aircraft VP-2
- Registry model: [Francis Charles S EVANS/FRANCIS VP 2](https://openairdocs.org/model/francis-charles-s-evans-francis-vp-2) (registry code 0563679) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: N84772
- Engines: CONTINENTAL A75 65 horsepower reciprocating
- Damage: Destroyed
- Flight: Personal, Part 91
- Operator: Harold Wirth
- Registered owner: Charles Samuel Francis
- Airworthiness certificate: Special, Experimental (Special)

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 44; seat: front; flight hours: 4,000 total, 2 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 40° at 10 knots
- Visibility: 30 statute miles
- Lowest ceiling: none

## 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 19870918053639A](https://openairdocs.org/incident/19870918053639A), Sep 18, 1987: Amtrev VOLKSPLNEVP2, Cedar Valley, UT, Destroyed. Unable to roll out of a turn after takeoff. Cartwheeled on ground impact. Aileron pully glued to structure.

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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