# NTSB FTW92DPG07: Ayres S2R, N4979X, Grady, AR, July 8, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: July 8, 1992, 10:30 local (15:30 UTC)
- Place: Grady, AR
- Coordinates: 34.069553, -91.689155 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=34.0696&lon=-91.6892&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report June 30, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 23412
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW92DPG07
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/23412/pdf
- Page: https://openairdocs.org/ntsb/FTW92DPG07

## Probable cause

THE LOSS OF ENGINE POWER DUE TO THE SEPARATION OF THE NUMBER ONE ENGINE CYLINDER. A FACTOR WAS THE UNSUITABLE TERRAIN.

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, cruise - normal
  - engine assembly,cylinder - separation (cause)
- Forced landing, descent - emergency
- In flight collision with object, descent - emergency
  - object - tree(s)
  - terrain condition - none suitable (contributing factor)
- Loss of control - in flight, descent - emergency
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

DURING A FORCED LANDING DUE TO LOSS OF ENGINE POWER THE AIRPLANE STRUCK A TREE WITH THE RIGHT WING. FOLLOWING THE TREE STRIKE THE AIRPLANE YAWED AND SLOWED DOWN. INITIAL GROUND CONTACT WAS WITH THE RIGHT WING, THIS CAUSED THE AIRPLANE TO ROTATE CLOCKWISE, RESULTING IN THE LANDING GEAR COLLAPSING. AN INSPECTION OF THE AIRPLANE REVEALED THAT THE NUMBER 1 CYLINDER HAD FAILED AND SEPARATED FROM THE ENGINE.

## Aircraft

- Registration: [N4979X](https://openairdocs.org/deregistered/N4979X-1998-03-17), registration cancelled 1998-03-17, S/N 5024R (OpenAirDocs)
- Reported make and model: AYRES S2R
- Registry model: [Rockwell International S-2R](https://openairdocs.org/model/rockwell-international-s-2r) (registry code 7630202) (OpenAirDocs)
- Category: Airplane
- Serial number: 5024R
- Airframe hours: 11611
- Engines: P&W R-1340-AN-1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Dirty Bird, Inc.
- Registered owner: Dirty Bird, Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, March 31, 1992, 289 hours before
- Departed: NONE
- Destination: NONE

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 67; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 13,000 total, 5,000 in this make and model, 12,500 as pilot in command, 150 in the last 90 days, 100 in the last 30 days, 9 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 21° at 6 knots
- Visibility: 5 statute miles
- Lowest ceiling: none
- Temperature: 90 °F, dew point 73 °F
- Altimeter: 30.00 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 19920708024309A](https://openairdocs.org/incident/19920708024309A), Jul 8, 1992: Ayres S2RR1340REST, Grady, AR, Substantial damage. Lost power returning to base. Wing caught a tree on forced landing. NR1 cylinder had cracked and separated.

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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