# NTSB NYC92LA095: Beech N35, N1252Z, Delaware, OH, June 3, 1992

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: June 2, 1992, 20:03 local (Jun 3, 1992, 00:03 UTC)
- Place: Delaware, OH
- Coordinates: 39.84024, -82.598999 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.8402&lon=-82.5990&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report August 26, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 37152
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC92LA095
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/37152/pdf
- Page: https://openairdocs.org/ntsb/NYC92LA095

## Probable cause

A LOSS OF CONTROL IN FLIGHT DUE TO WAKE TUBULENCE FROM A PRECEDING HELICOPTER.  A FACTOR RELATED TO THE ACCIDENT WAS THE FAILURE OF THE PILOT TO RECOGINIZE THE HAZARDS OF HIS CLOSE PROXIMITY BEHIND THE LANDING HELICOPTER.

## Sequence of events

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

- Loss of control - in flight, landing - flare/touchdown
  - planned approach - improper, pilot in command (cause)
  - wake turbulence - encountered, pilot in command (cause)
- In flight collision with terrain/water, descent - uncontrolled
  - remedial action - not possible, pilot in command

## Analysis

THE BONANZA WAS FOLLOWING AN ARMY AH-1S ON LANDING APPROACH. THE HELICOPTER CROSSED THE THRESHOLD AT APPROX 200 FT AGL AND PLANNED A TOUCHDOWN APPROX 1500 FT FROM THE APPROACH END. WHILE THE HELICOPTER WAS STILL ABOUT 250 FT FROM TOUCHDOWN, THE BONANZA CROSSED THE THRESHOLD AND WAS OBSERVED TO ROLL LEFT AND STRIKE THE GROUND WITH ITS LEFT WING. THE BONANZA CONTINUED ACROSS A TAXIWAY AND CAME REST IN AN AIRCRAFT PARKING AREA. THE HELICOPTER WEIGHED APPROXIMATELY 8400 POUNDS. WHEN INTERVIEWED AFTER THE ACCIDENT, THE BONANZA PILOT SAID HE WAS AWARE OF HELICOPTER WAKE TURBULENCE AND SAID HE THOUGHT THERE WAS SUFFICIENT SEPARATION BETWEEN HIS AIRPLANE AND THE PRECEDING HELICOPTER.

## Aircraft

- Registration: [N1252Z](https://openairdocs.org/deregistered/N1252Z-2012-10-11), registration cancelled 2012-10-11, S/N D-6715, built 1961 (OpenAirDocs)
- Reported make and model: BEECH N35
- Registry model: [Beech N35](https://openairdocs.org/model/beech-n35) (registry code 1151528) (OpenAirDocs)
- Registry engine: [Continental I0-470 series](https://openairdocs.org/engine/continental-i0-470-series) (registry code 17027, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: D-6715
- Airframe hours: 2029
- Engines: CONTINENTAL IO-470 260 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Ronald L. Montgomery
- Registered owner: Robert Gaunt & Associates, Inc
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, December 1, 1991, 50 hours before
- Departed: CMH, COLUMBUS, OH
- Airport: DLZ, Delaware Municipal, runway 1, 4,098 × 75 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 49; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 1,618 total, 400 in this make and model, 1,320 as pilot in command, 23 in the last 90 days, 1 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 60° at 5 knots
- Visibility: 5 statute miles
- Lowest ceiling: none
- Temperature: 72 °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 19920602017969A](https://openairdocs.org/incident/19920602017969A), Jun 2, 1992: Beech N35, Delaware, OH, Substantial damage. Encountered loss of control on final while landing behind a army helicopter. Cartwheeled on impact.

## Other investigations on N1252Z (2)

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 LAX68D0098](https://openairdocs.org/ntsb/LAX68D0098), Aug 12, 1967: Beech N35 (N1252Z), Daggett, CA, substantial damage
- [NTSB LAX66D0083](https://openairdocs.org/ntsb/LAX66D0083), Aug 11, 1965: Beechcraft 35 (N1252Z), Big Bear, CA, 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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