# NTSB CHI91DTG06: Ayres S2R, N8988Q, Drayton, ND, July 20, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: July 20, 1991, 16:30 local (21:30 UTC)
- Place: Drayton, ND
- Coordinates: 48.55941, -97.170173 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=48.5594&lon=-97.1702&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report January 25, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 14875
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI91DTG06
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14875/pdf
- Page: https://openairdocs.org/ntsb/CHI91DTG06

## Probable cause

THAT THE PILOT DID NOT PERFORM ANY PREFLIGHT PLANNING, AND DID NOT USE THE AIRCRAFT PERFORMANCE DATA.

## Sequence of events

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

- Overrun, takeoff - roll/run
  - performance data - not used, pilot in command (cause)
  - preflight planning/preparation - not performed, pilot in command (cause)
- Loss of control - on ground/water, takeoff - roll/run
- On ground/water encounter with terrain/water, takeoff - roll/run

## Analysis

THE AIRPLANE RAN OFF THE END OF THE RUNWAY DURING TAKEOFF FOR AN AGRICULTURAL FLIGHT AND THE RIGHT MAIN LANDING GEAR COLLAPSED.  THE PILOT STATED THAT THE AIRCRAFT WOULD NOT REACH TAKEOFF SPEED, AND THAT HE HAD MADE NUMEROUS ATTEMPTS WITH NEGATIVE RESULTS.  HE ALSO STATED THAT HE HAD MADE NO PREFLIGHT PERFORMANCE CALCULATIONS.  THE RUNWAY WAS 2,600 FOOT GRASS STRIP.  DENSITY ALTITUDE WAS 3,700 FEET.

## Aircraft

- Registration: [N8988Q](https://openairdocs.org/aircraft/N8988Q), registered now, S/N 1488R, built 1969 (OpenAirDocs)
- Reported make and model: Ayres S2R
- Registry model: [Aero Commander S2R](https://openairdocs.org/model/aero-commander-s2r) (registry code 0143022) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 1488R
- Engines: P&W R-1340-AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Bonanza Valley Aviation, Inc.
- Registered owner: Bonanza Valley Aviation, Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: 100 hour, January 2, 2000
- Airport: 2NA5, Sanderson, runway 9, 2,600 × 100 ft, grass/turf

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 38; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 8,500 total, 7,900 as pilot in command

## Weather

- Conditions: Visual (VMC), Dawn
- Wind: 40° at 8 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 88 °F, dew point 63 °F
- Altimeter: 29.00 inHg
- Observed at: GFK, 40 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 19910720028699A](https://openairdocs.org/incident/19910720028699A), Jul 20, 1991: Ayres S2RR1340REST, Drayton, ND, Substantial damage. Repeated attempts to lift failed. Ran off end runway collapsing gear. Did not dump load or timely abort.

## Other investigations on N8988Q (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 LAX70F0157](https://openairdocs.org/ntsb/LAX70F0157), Oct 13, 1969: Aero Comdr S-2R (N8988Q), Shafter, CA, substantial damage, 1 fatal

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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