# NTSB FTW88DPJ07: Northrop C-125A, N3756Q, Tulsa, OK, June 29, 1988

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Final report
- Date: June 29, 1988, 06:25 local (11:25 UTC)
- Place: Tulsa, OK
- Location: 36.1540° N, 95.9928° W: Placed by OpenAirDocs: center of Tulsa, OK, within about 8 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.1540&lon=-95.9928&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor
- Status: Completed, report July 10, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 22457
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW88DPJ07
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/22457/pdf
- Page: https://openairdocs.org/ntsb/FTW88DPJ07

## 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
  - electrical system - corroded (cause)
  - inadeq substantiation process,inadeq documentation, company/operator mgmt (contributing factor)
  - electrical system - deteriorated (cause)
  - propeller system/accessories,reversing system - engaged (cause)
  - procedures/directives - disregarded, pilot in command (cause)
  - operation with known deficiencies in equipment - attempted, pilot in command (cause)
  - lack of total experience in type of aircraft, pilot in command (contributing factor)
  - lack of total experience in type of aircraft, copilot/second pilot (contributing factor)
- Forced landing, descent - emergency
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

THE PILOT DID NOT HOLD A TYPE RATING OR WRITTEN AUTHORIZATION TO ACT AS PILOT IN COMMAND.  THE CO-PILOT DID NOT HOLD A TYPE RATING OR WRITTEN AUTHORIZATION TO ACT AS SECOND IN COMMAND AND HIS MEDICAL HAD EXPIRED.  THE AIRCRAFT DID NOT HAVE AN AIRWORTHINESS CERTIFICATE NOR HAD A SPECIAL FLIGHT PERMIT BEEN ISSUED.  THE LEFT PROPELLER WENT INTO REVERSE DURING THE INITIAL CLIMB DUE TO CORROSION AND DETERIORATION OF THE WIRING THAT CONTROLLED THE PROPELLER. THE ACFT CRASHED OUT OF CONTROL AFTER COLLIDING WITH POWER LINES DURING TAKEOFF. IT STRUCK THE GROUND AND WENT THRU A FENCE THEN DOWN A SLOPE AND OVER AN EMBANKMENT. THE ACFT THEN BOUNCED ACROSS A STREET WHILE TURNING AROUND AND COLLIDING WITH A POWER LINE POLE TAIL FIRST. THE ACFT HAD TRAVELED ABOUT 537 FT FROM INITIAL GROUND CONTACT. ALL 3 ENGINES WERE STILL PRODUCING POWER WHEN THE ACFT CAME TO REST.

## Aircraft

- Registration: [N3756Q](https://openairdocs.org/deregistered/N3756Q-2013-03-25), registration cancelled 2013-03-25, S/N 48-634 (OpenAirDocs)
- Reported make and model: NORTHROP C-125A
- Registry model: [Northrop C-125A](https://openairdocs.org/model/northrop-c-125a) (registry code 6450104) (OpenAirDocs)
- Category: Airplane
- Serial number: 48-634
- Engines: WRIGHT R-1820-202A 1275 horsepower reciprocating
- Damage: Substantial damage
- Fire: On-Ground
- Flight: Business, Part 91
- Registered owner: Darryl G. Greenamyer, Inc.
- Last inspection: Unknown, May 2, 1988, 56 hours before
- Departed: TUL
- Destination: FOF, DAYTON, OH
- Flight plan: VFR
- Airport: TUL, Tulsa International, runway 26, 7,700 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 51; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 6,274 total, 56 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 160° at 6 knots
- Visibility: 15 statute miles
- Lowest ceiling: 7,000 ft broken
- Temperature: 75 °F
- Altimeter: 29.00 inHg
- Observed at: TUL, 1 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 19880629027419A](https://openairdocs.org/incident/19880629027419A), Jun 29, 1988: Nortrp C125A, Tulsa, OK, Substantial damage. Left prop reversed on climbout. Unable to stop left turn. Hit wires and crashed. No type ratings or ferry permit.

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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