# NTSB FTW91LA153: Cessna 150M, N704CP, Haskell, OK, August 23, 1991

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: August 23, 1991, 11:55 local (16:55 UTC)
- Place: Haskell, OK
- Coordinates: 35.820369, -95.670783 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.8204&lon=-95.6708&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report March 31, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 23391
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW91LA153
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/23391/pdf
- Page: https://openairdocs.org/ntsb/FTW91LA153

## Probable cause

IMPROPER INSTALLATION OF AVIONICS EQUIPMENT RESULTING IN INTERFERENCE WITH FLIGHT CONTROL.

## Sequence of events

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

- Loss of control - in flight, cruise
  - flt control syst,yoke/control stick - blocked(partial) (cause)
  - maintenance,installation - improper, other maintenance personnel (cause)
  - level off - not possible, pilot in command
- In flight collision with object, descent - uncontrolled
  - object - guy wire
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

WHILE CRUSING AT 500 FEET AGL THE PILOT FELT A SLIGHT CHANGE IN PITCH DOWNWARDS TOWARD POWER LINES. HE MADE CONTACT WITH THE TOP GUY WIRE BETWEEN TWO HIGH TENSION POWER LINES. THE PILOT STATED HE FELT A BINDING IN THE ELEVATOR CONTROLS WHICH RESTRICTED ELEVATOR MOVEMENT MAKING IT IMPOSSIBLE TO CLEAR THE POWER LINES. ON-SITE INVESTIGATION REVEALED THE AVIONICS EQUIPMENT RACK ON THE INSTRUMENT PANEL HAD PARTIALLY COLLAPSED, RESTRICTING THE MOVEMENT OF THE ELEVATOR. THE AVIONICS EQUIPMENT RACK WAS FOUND TO BE IMPROPERLY INSTALLED. AFTER IMPACTING THE GUY WIRE (115 AGL), THE AIRPLANE TUMBLED END OVER END, CONTACTING FOUR OF THE SEVEN HIGH TENSION WIRES BEFORE IMPACTING THE GROUND.

## Aircraft

- Registration: [N704CP](https://openairdocs.org/deregistered/N704CP-2018-03-16), registration cancelled 2018-03-16, S/N 15078508, built 1976 (OpenAirDocs)
- Reported make and model: CESSNA 150M
- Registry model: [Cessna 150M](https://openairdocs.org/model/cessna-150m) (registry code 2071830) (OpenAirDocs)
- Registry engine: [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series) (registry code 17020, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 15078508
- Engines: CONTINENTAL O-200-A 100 horsepower reciprocating
- Damage: Substantial damage
- Fire: Unknown
- Flight: Personal, Part 91
- Operator: Bryce D. Willis
- Registered owner: Bryce D. Willis

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 61; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; flight hours: 2,560 total, 1,500 in this make and model, 2,100 as pilot in command, 9 in the last 90 days, 3 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 4 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 19910823036619A](https://openairdocs.org/incident/19910823036619A), Aug 23, 1991: Cessna 150M, Haskell, OK, Substantial damage. Cruising low altitude. Radio rack broke,dropped and jammed control column. Crashed into powerlines.

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.