# NTSB MKC86LA102: Aero Commander S2R, N5509X, Almyra, AR, May 10, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: May 9, 1986, 20:00 local (May 10, 1986, 01:00 UTC)
- Place: Almyra, AR
- Coordinates: 34.40068, -91.409461 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=34.4007&lon=-91.4095&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 34171
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC86LA102
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/34171/pdf
- Page: https://openairdocs.org/ntsb/MKC86LA102

## Sequence of events

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

- Loss of control - on ground/water, landing - roll
  - landing gear,normal brake system - failure,partial (cause)
  - brakes(normal) - not possible, pilot in command (cause)
  - directional control - not possible, pilot in command (cause)
- On ground/water encounter with terrain/water, landing - roll
  - terrain condition - ditch (cause)
- Main gear collapsed, landing - roll

## Analysis

THE PLT STATED THAT THE LANDING WAS ROUTINE UNTIL HE USED THE BRAKES. AT THIS POINT THE LEFT WHEEL BRAKE ASSEMBLY CAME APART AND THE ACFT VEERED OUT OF CONTROL OFF THE RIGHT SIDE OF THE RWY AND INTO A DITCH, WHERE THE LEFT MAIN LANDING GEAR COLLAPSED. POST ACCIDENT INSPECTION OF THE BRAKE ASSEMBLY REVEALED A WORN OUT BRAKE PISTON. ACCORDING TO AN A&P/IA, THIS PISTON DESIGN ASSEMBLY IS PRONE TO PREMATURE WEAR.

## Aircraft

- Registration: [N5509X](https://openairdocs.org/deregistered/N5509X-2014-10-27), registration cancelled 2014-10-27, S/N 1709R, built 1973 (OpenAirDocs)
- Reported make and model: AERO COMMANDER 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: 1709R
- Airframe hours: 3553
- Engines: P&W R-1340-AN-1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Grand Prairie Flying Serv. Inc
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, April 14, 1987, 249 hours before
- Airport: M73, Alyra Municipal, runway 28, 2,000 × 50 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 42; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; flight hours: 9,600 total, 3,000 in this make and model, 9,400 as pilot in command, 150 in the last 90 days, 50 in the last 30 days, 7 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Dusk
- Wind: 180° at 4 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 73 °F, dew point 66 °F
- Altimeter: 29.00 inHg
- Observed at: LIT, 43 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 19860509016809A](https://openairdocs.org/incident/19860509016809A), May 9, 1986: Ayres S2RR1340REST, Almyra, AR, Substantial damage. The aircraft ground looped on landing. Theleft brake piston was worn.

## Other investigations on N5509X (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 FTW75DPG57](https://openairdocs.org/ntsb/FTW75DPG57), May 10, 1975: Aero Comdr 600S2R (N5509X), Almyra, AR, 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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