# NTSB MKC87LA152: Aero Commander Callair A9-B, N7726V, Osgood, MO, July 31, 1987

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 31, 1987, 15:45 local (20:45 UTC)
- Place: Osgood, MO
- Coordinates: 40.079368, -93.599899 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.0794&lon=-93.5999&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report May 16, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 34424
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC87LA152
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/34424/pdf
- Page: https://openairdocs.org/ntsb/MKC87LA152

## 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
  - powerplant - vibration
  - propeller system/accessories - separation (contributing factor)
  - engine assembly,cylinder - separation (contributing factor)
  - engine assembly,crankshaft - failure,total (cause)
  - engine assembly,crankshaft - separation (cause)
- Forced landing, descent - emergency
  - spray/dusting equipment - burst
  - window,flight compartment window/windshield - dirty(foggy)
  - visual lookout - reduced, pilot in command
- Nose over, landing - roll
  - terrain condition - none suitable (contributing factor)

## Analysis

DURING AN AERIAL APPLICATION OPERATION, PILOT EXPERIENCED PARTIAL POWER LOSS AND VIBRATION, FOLLOWED BY A LOUD EXPLOSIVE SOUND AND TOTAL LOSS OF POWER. AN EMERGENCY LDG WAS MADE FOLLOWED BY A NOSE OVER. POSTACCIDENT INSPECTION REVEALED THE ENTIRE PROPELLER ASSEMBLY, ONE CYLINDER, AND PART OF THE CRANKSHAFT WERE MISSING. THIS COMPLETE ASSEMBLY WAS FOUND ABOUT THREE MONTHS LATER, APPROXIMATELY ONE QUARTER MILE FROM THE ACCIDENT SCENE. MET LAB REPORT ON PORTION OF CRANKSHAFT THAT REMAINED WITH ACFT INDICATED NO UNUSUAL WEAR OR DAMAGE THAT MIGHT CAUSE ITS FAILURE. THE PIC STATED THAT AFTER THE EXPLOSION, WHICH BLEW THE FRONT HOPPER LOADING LID OFF, THE SPRAY MATERIAL COVERED THE WINDSHIELD MAKING VISIBILITY DIFFICULT.

## Aircraft

- Registration: [N7726V](https://openairdocs.org/deregistered/N7726V-1988-06-02), registration cancelled 1988-06-02, S/N 1477 (OpenAirDocs)
- Reported make and model: AERO COMMANDER CALLAIR A9-B (CALLAIR A9)
- Registry model: [Aero Commander CALLAIR A-9B](https://openairdocs.org/model/aero-commander-callair-a-9b) (registry code 0144206) (OpenAirDocs)
- Category: Airplane
- Serial number: 1477
- Airframe hours: 3000
- Engines: LYCOMING IO-540-G1C5 290 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Ray Klinginsmith
- Airworthiness certificate: Special, Restricted (Special)
- Departed: TRX, TRENTON, MO
- Airport: TRX, Trenton, runway 18, 4,300 × 50 ft, dirt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 52; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 4,500 total, 4,500 as pilot in command, 82 in the last 90 days, 55 in the last 30 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 90 °F, dew point -0 °F

## 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 19870731081209A](https://openairdocs.org/incident/19870731081209A), Jul 31, 1987: Airpts A9B, Osgood, MO, Substantial damage. Engine crankshaft broke on climbout. Emergency landing terminated in a nose over.

## Other investigations on N7726V (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 MIA74DKJ20](https://openairdocs.org/ntsb/MIA74DKJ20), Aug 28, 1973: Aero Comdr A-9B (N7726V), Hazel Green, AL, 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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