# Accident 19980404005579A: Ayres S2R, Cushing, OK, April 4, 1998

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: April 4, 1998, 11:20 local time
- Place: Cushing, OK
- Airport: Cushing Municipal Airport
- Damage: Substantial damage
- Phase of flight: Forced/Precautionary Landing
- Operating rules: General operating rules (Part 91)
- Operator: SNZG
- Location: 35.9696° N, 96.7609° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=35.9696&lon=-96.7609&mi=10
- Aircraft: N8984Q, registered now (https://openairdocs.org/aircraft/N8984Q) (OpenAirDocs)
- Registry model: Aero Commander S2R (registry code 0143022, https://openairdocs.org/model/aero-commander-s2r) (OpenAirDocs)
- Registry engine: Pratt & Whitney R1340 series (registry code 52016, https://openairdocs.org/engine/pratt-whitney-r1340-series) (OpenAirDocs)
- Reported make and model: AYRES S2R
- Reported engine: WRIGHT R182076B
- People aboard: 1
- Fatal injuries: 0
- Pilot flight hours: 19,200 total, 1,600 in this make and model, 50 in the last 90 days
- NTSB investigation: [NTSB FTW98LA171](https://openairdocs.org/ntsb/FTW98LA171) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19980404005579A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

(.4)DURING THE INITIAL TAKEOFF/CLIMB LOSS OF MANIFOLD PRESSURE WAS NOTED BY THE PILOT.  THE ENGINE BACKFIRED AS THE PILOT INCREASED THE THROTTLE AND MIXTURE AND LOST POWER.  DURING THE FORCED LANDING, THE PILOT MANEUVERED THE AIRPLANE TO AVOID POWER LINES AND HOMES.  THE MAIN GEAR COLLAPSED AS THE AIRPLANE TOUCHED DOWN HARD IN AN OPEN FIELD.  EXAMINATION REVEALED THAT THE MIXTURE CONTROL AT THE CARBURETOR WAS SET AT LESS THAN 50 PERCENT TRAVEL TOWARD THE RICH STOP ON THE CARBURETOR.  ENGINE CONTINUTIY WAS CONFIRMED TO THE ACCESSORY CASE;  HOWEVER, NEITHER MAGNETO ROTATED WHEN THE PROPLEER ROTATED. A MECHANIC STATED THAT THIS LACK OF MAGNETO RATATION INDICATES THAT THE ACCESSOR SHAFT HAS SHEARED INSIDE THE REAR CASE OF THE ENGINE.  THE CARBURETOR AND ENGINE WERE NOT DISASSEMBLED, THERE FORE, IT WAS NOT DETERMINED WHETHER THE DAMAGE TO THE MIXTURE CONTROL AND THE DRIVE SHAFT WERE PREEXISTING OR IMPACT RELATED.                                                     (-23) SEE NARRATIVE #FTW98LA171.

## The NTSB's investigation of this event (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 FTW98LA171](https://openairdocs.org/ntsb/FTW98LA171), Apr 4, 1998: Aero Commander S2R (N8984Q), Cushing, OK, substantial damage. Probable cause: The total loss of engine power resulting from a sheared accessory drive due to an undetermined reason. A factor was the lack of suitable terrain for the forced landing.

## Other reports on N8984Q (1)

Matched to the same aircraft by N-number and date.

- [Incident 19950217004659I](https://openairdocs.org/incident/19950217004659I), Feb 17, 1995: Ayres S2RR1820 (N8984Q), Cushing, OK, Minor damage. Narrative: on February 17, 1995, at approximately 1445 local time, an aircraft, N8984, ayers S2R, was on a flight to dispense herbicide material with a full…

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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