# NTSB FTW89DPJ07: Beech T-34, N34CJ, Haskell, OK, June 24, 1989

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Final report
- Date: June 24, 1989, 15:35 local (20:35 UTC)
- Place: Haskell, OK
- Coordinates: 35.819911, -95.670852 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.8199&lon=-95.6709&mi=10
- Phase of flight: [Other](https://openairdocs.org/ntsb-phases/800) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed, report June 19, 1991
- Report: Approved by Office Director
- NTSB case key (mKey): 22701
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW89DPJ07
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/22701/pdf
- Page: https://openairdocs.org/ntsb/FTW89DPJ07

## Probable cause

FAILURE OF THE PILOT TO MAINTAIN ADEQUATE AIRSPEED, WHICH RESULTED IN AN INADVERTENT STALL.  FACTORS RELATED TO THE ACCIDENT WERE:   A LEAK IN THE PITOT SYSTEM, FAILURE OF THE PILOT TO OBTAIN  ADEQUATE MAINTENANCE/INSPECTION OF THE PITOT SYSTEM, AND HIS LACK OF FAMILIARITY WITH THE AIRCRAFT.

## Sequence of events

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

- Airframe/component/system failure/malfunction, other
  - pitot/static system - leak (contributing factor)
  - maintenance,inspection - inadequate, pilot in command (contributing factor)
- Loss of control - in flight, maneuvering
  - procedures/directives - not followed, pilot in command
  - stall warning system - not installed
  - airspeed - not maintained, pilot in command (cause)
  - stall - inadvertent, pilot in command (cause)
  - lack of familiarity with aircraft, pilot in command (contributing factor)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

THE AIRSPEED INDCR WAS MALFUNCTIONING ON A PREVIOUS FLT. BFR TAKING OFF AGAIN, THE PLT WAS SEEN TO DISASSEMBLE THE PITOTTUBE AS IF THE REMOVE FOREIGN MATTER. ON THE NEXT FLT, HE BGN A HI SPD/LOW PASS OVR RWY 35. AT ABT MIDFIELD, THE ACFT ENTERED A CLIMB TO APRX 800 TO 1000 FT AGL. NR THE PEAK OF THE CLIMB, THERE WAS A REDUCTION OF PWR & THE ACFT MNVRD (TURNED LEFT, THEN RGT, AS IF TO ENTER A BASE TURN FOR RWY 17). THE LNDG GEAR WAS EXTDD AT ABT 300 TO 500 FT AGL, FLWD BY A TURN (SOUTH) TWD THE RWY. AFTER ABT 45 DEG OF TURN, THE ACFT ENTERED A STEEP DSCNT & CRASHED. AN EXAM REVEALED A RUBBER PITOT LINE, PN 35-324323, WAS DETERIORATED & LEAKED. NO OTR PREIMPACT PART FAILURE WAS FND. EXPERIMENTAL CATEGORYACFT WITH SVRL LIMITATIONS: FLTS RSTRD TO TX; EXHIBITION ONLY; PIC WAS REQUIRED TO HAVE AN INSTRUCTOR'S LOGBOOK ENDORSE-MENT OR LETTER OF AUTHORIZATION (LOA) TO OPER THE ACFT. NEITHER AN ENDORSEMENT NOR LOA WAS FND. PLT HAD ABT 1 HR IN T-34ACFT; CANNABINOIDS DETECTED IN PLT'S URINE, BUT NONE FND IN HIS BLOOD. ACFT WAS NOT EQUIPPED WITH STALL WARNING SYS.

## Aircraft

- Registration: [N34CJ](https://openairdocs.org/deregistered/N34CJ-2013-07-10), registration cancelled 2013-07-10, S/N CG-211, built 1958 (OpenAirDocs)
- Reported make and model: BEECH T-34
- Registry model: [Beech T34 MENTOR](https://openairdocs.org/model/beech-t34-mentor) (registry code 1152003) (OpenAirDocs)
- Registry engine: [Continental I0-470 series](https://openairdocs.org/engine/continental-i0-470-series) (registry code 17027, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: CG-211
- Airframe hours: 5550
- Engines: CONTINENTAL IO-470-N 260 horsepower reciprocating
- Damage: Destroyed
- Flight: Part 91
- Registered owner: Red Stevenson
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: 100 hour, January 3, 1989, 10 hours before
- Departed: 00K7
- Airport: 0OK7, Haskell, runway 17, 3,710 × 30 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 40; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: rear; toxicology performed; flight hours: 778 total, 1 in this make and model, 653 as pilot in command

## Weather

- Conditions: Visual (VMC), Day
- Wind: 170° at 8 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 88 °F, dew point 72 °F
- Altimeter: 30.00 inHg
- Observed at: TUL, 23 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 19890624017329A](https://openairdocs.org/incident/19890624017329A), Jun 24, 1989: Beech T34C, Haskell, OK, Destroyed, 2 fatal. During high speed low altitude pass began a climb and turns. Crashed. Pitot line found deteriorated and leaking.

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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