# NTSB FTW91LA106: Rockwell 112TC, N4596W, Ovilla, TX, June 21, 1991

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: June 21, 1991
- Place: Ovilla, TX
- Coordinates: 32.509284, -96.799652 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=32.5093&lon=-96.7997&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor
- Status: Completed, report March 24, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 23352
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW91LA106
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/23352/pdf
- Page: https://openairdocs.org/ntsb/FTW91LA106

## Probable cause

THE MECHANICAL FAILURE OF THE TURBOCHARGER. FACTORS WERE THE INADEQUATE ANNUAL INSPECTION AND THE PILOT'S IMPROPER FLARE IN THE FORCED LANDING.

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, climb - to cruise
  - exhaust system,turbocharger - binding(mechanical) (cause)
  - exhaust system,wastegate - corroded
  - maintenance,annual inspection - inadequate, other maintenance personnel (contributing factor)
- Forced landing, descent - emergency
- Hard landing, landing - flare/touchdown
  - flare - improper, pilot in command (contributing factor)
- Main gear collapsed, landing - flare/touchdown
  - landing gear,main gear - overload

## Analysis

UPON DEPARTING THE AIRPORT A TOTAL POWER LOSS WAS EXPERIENCED. AN ATTEMPTED RETURN TO THE AIRPORT WAS UNSUCCESSFUL AND RESULTED IN A FORCED LANDING IN AN OPEN FIELD. SUBSEQUENT EXAMINATION OF THE WRECKAGE REVEALED THAT THE TURBOCHARGER HAD MALFUNCTIONED RESULTING IN THE POWER LOSS. AFTER A HARD LANDING THE MAIN LANDING GEAR COLLAPSED. A SMALL POST-IMPACT FIRE DEVELOPED IN A BALE OF HAY BUT WAS EXTINGUISHED BY THE FIRE DEPARTMENT. ALTHOUGH AN ANNUAL INSPECTION HAD BEEN PERFORMED 57 HOURS PRIOR TO THE ACCIDENT, THE EXHAUST SYSTEM WAS IN POOR CONDITION AND THE TURBOCHARGER WASTE GATE WAS BADLY CORRODED.

## Aircraft

- Registration: [N4596W](https://openairdocs.org/deregistered/N4596W-2013-07-15), registration cancelled 2013-07-15, S/N 13086, built 1976 (OpenAirDocs)
- Reported make and model: ROCKWELL 112TC
- Registry model: [Rockwell International 112TC](https://openairdocs.org/model/rockwell-international-112tc) (registry code 7630306) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 13076
- Airframe hours: 793
- Engines: LYCOMING TIO-360-C1A6D 210 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Fred Carstens
- Registered owner: Fred Carstens
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, September 20, 1990, 57 hours before
- Destination: APA, ENGLEWOOD, CO

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 57; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 432 total, 94 in this make and model, 432 as pilot in command, 41 in the last 90 days, 34 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 75 °F, dew point -0 °F
- Altimeter: 29.00 inHg

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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