# NTSB MKC86LA085: Aero Commander S2R, N5564X, Jackson, MO, April 11, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: April 11, 1986, 12:00 local (18:00 UTC)
- Place: Jackson, MO
- Coordinates: 37.380039, -89.650123 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=37.3800&lon=-89.6501&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 34157
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC86LA085
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/34157/pdf
- Page: https://openairdocs.org/ntsb/MKC86LA085

## Sequence of events

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

- Fire, cruise - normal
  - exhaust system,clamp - separation (cause)
  - maintenance,inspection - inadequate, other maintenance personnel (cause)
- Loss of engine power, cruise - normal
- Forced landing, maneuvering
  - terrain condition - open field

## Analysis

IN CRUISE FLT THE PIC SMELLED SOMETHING BURNING AND NOTICED BLACK AND WHITE SMOKE POURING FM THE ENG COWLING. THIS WAS FOLLOWED BY A PARTIAL LOSS OF PWR. A PRECAUTIONARY LANDING WAS MADE IN A FIELD. THE PIC NOTICED FLAMES ERUPTING FM THE ENG AREA AFTER EXITING THE ACFT. LATER INSPECTION REVEALED A LOOSE EXHAUST COLLECTOR RING CLAMP HAD SLIPPED OUT OF POSITION. THE RESULTANT SEPARATION OF THE EXHAUST TUBING ALLOWED THE HOT EXHAUST TO BE DIVERTED TO THE CARBURETOR AREA OF THE ENG AND A FIRE ENSUED. THE HOT EXHAUST WAS INGESTED INTO THE CARBURETOR INLET CONTRIBUTING TO THE ENG'S PARTIAL PWR LOSS.

## Aircraft

- Registration: [N5564X](https://openairdocs.org/deregistered/N5564X-2013-05-30), registration cancelled 2013-05-30, S/N 1764R, 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: 1764R
- Airframe hours: 3800
- Engines: P&W R1340 600 horsepower reciprocating
- Damage: Substantial damage
- Fire: On-Ground
- Flight: Aerial application, Part 137
- Operator: Ken Mc Dowell, doing business as Mcdowell Flying Service
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: 100 hour, September 13, 1985, 80 hours before
- Departed: CGI, CAPE GIRARDEAU, MO

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; commercial; airplane ratings: single-engine land, multi-engine land; medical: class 2, valid medical--w/ waivers/lim; flight hours: 13,453 total, 3,500 in this make and model, 12,875 as pilot in command, 100 in the last 90 days, 8 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 340° at 8 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 70 °F, dew point 41 °F
- Altimeter: 29.00 inHg
- Observed at: CGI, 8 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 19860411039249A](https://openairdocs.org/incident/19860411039249A), Apr 11, 1986: Ayres S2RNORMAL, Cape Girardeau, MO, Substantial damage. Bolt missing from exhaust collector ring clamp. Exhaust gases ignited excess oil in area. Landed in field, burned.

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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