# NTSB FTW85FA014: Piper PA-23-170, N1094P, Seguin, TX, October 16, 1984

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Field investigation · Final report
- Date: October 16, 1984, 11:09 local (16:09 UTC)
- Place: Seguin, TX
- Coordinates: 29.569879, -97.959556 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=29.5699&lon=-97.9596&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 4 fatal
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 21497
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW85FA014
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21497/pdf
- Page: https://openairdocs.org/ntsb/FTW85FA014

## Sequence of events

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

- Airframe/component/system failure/malfunction, cruise
  - hydraulic system,line - burst (contributing factor)
  - maintenance,inspection - inadequate, other maintenance personnel (contributing factor)
  - propeller feathering - performed, pilot in command (contributing factor)
- Loss of control - in flight, maneuvering - turn to landing area (emergency)
  - in-flight planning/decision - improper, pilot in command (cause)
  - airspeed(vmc) - not maintained, pilot in command (cause)
  - procedures/directives - improper, pilot in command
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

SHORTLY AFTER TAKEOFF, ACFT RETURNED WITH AN UNKNOWN ENGINE PROBLEM. LEFT ENGINE WAS FEATHERED AND GEAR PARTIALLY EXTENDED. ACFT TOO HIGH ON FINAL TO LAND, ACFT CONTINUED DOWN RWY, DESCENDING AND SLOWING DOWN. WITNESS SAID ACFT ENTERED A VMC ROLL AND DOVE INTO THE GROUND. BURST HYDRAULIC LINE WAS FOUND ON LEFT ENGINE. WITNESSES DISAGREE WHETHER PLT REPORTED ERRATIC OIL PRESSURE. NO EVIDENCE OF OIL SYSTEM FAILURE WAS FOUND. LAST ACFT ANNUAL INSPECTION WAS COMPLETED 1 FLT HR BEFORE ACCIDENT OCCURRED.

## Aircraft

- Registration: [N1094P](https://openairdocs.org/deregistered/N1094P-2011-03-02), registration cancelled 2011-03-02, S/N 23-103, built 1954 (OpenAirDocs)
- Reported make and model: PIPER PA-23-170
- Registry model: [Piper PA-23-150](https://openairdocs.org/model/piper-pa-23-150) (registry code 7102303) (OpenAirDocs)
- Registry engine: [Lycoming 0-340 series](https://openairdocs.org/engine/lycoming-0-340-series) (registry code 41510, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 23-103
- Airframe hours: 4322
- Engines: LYCOMING O-340-A1A 170 horsepower reciprocating
- Damage: Destroyed
- Fire: On-Ground
- Flight: Business, Part 91
- Registered owner: Louis H. Button & Assoc.
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, September 29, 1984, 1 hours before
- Destination: SAT
- Airport: T90, Geronimo, runway 12, 3,670 × 45 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 61; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; toxicology performed; flight hours: 2,000 total

## Weather

- Conditions: Visual (VMC), Day
- Wind: 190° at 8 knots
- Visibility: 10 statute miles
- Lowest ceiling: 1,000 ft broken
- Temperature: 79 °F, dew point 70 °F
- Altimeter: 29.00 inHg

## 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 19841016056299A](https://openairdocs.org/incident/19841016056299A), Oct 16, 1984: Piper STCPA23, Seguin, TX, Destroyed, 3 fatal. Lost oil pressure, feathered left prop. Attempted single engine go around with gear down, impacted ground.

## Other investigations on N1094P (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 DEN67F0135](https://openairdocs.org/ntsb/DEN67F0135), Oct 24, 1966: Piper PA-23 (N1094P), Sterling, CO, substantial damage

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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