# NTSB SEA87LA056: Cessna 150, N50724, Mountain Home, ID, February 12, 1987

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: February 12, 1987, 16:00 local (23:00 UTC)
- Place: Mountain Home, ID
- Coordinates: 43.360912, -115.520362 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.3609&lon=-115.5204&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report March 21, 1988
- Report: Approved by Office Director
- NTSB case key (mKey): 40592
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA87LA056
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40592/pdf
- Page: https://openairdocs.org/ntsb/SEA87LA056

## 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, takeoff - initial climb
  - engine assembly,cylinder - brittle fracture (cause)
  - maintenance,major repair - improper, other maintenance personnel (cause)
- Forced landing, landing
- Nose over, landing - roll
  - terrain condition - soft (cause)

## Analysis

ACFT LOST PWR ON INIT CLIMB FROM TAKEOFF, NECESSITATING A FORCED LANDING IN AN OPEN FIELD. ACFT NOSED OVER INVERTED AFTER TOUCHDOWN IN SOFT TERRAIN. INVESTIGATION REVEALED #3 CYLINDER ROCKER ARM BOSSES HAD BROKEN. INSPECTION SHOWED, DURING PREVIOUS REPAIR, ATTEMPT TO STAKE BUSHINGS WITH CENTER PUNCH TOOL. FRACTURES ORIGINATED AT THESE TOOL MARKS.

## Aircraft

- Registration: [N50724](https://openairdocs.org/deregistered/N50724-2013-04-18), registration cancelled 2013-04-18, S/N 15069510, built 1968 (OpenAirDocs)
- Reported make and model: CESSNA 150
- Registry model: [Cessna 150J](https://openairdocs.org/model/cessna-150j) (registry code 2071820) (OpenAirDocs)
- Registry engine: [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series) (registry code 17020, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 15069510
- Airframe hours: 5225
- Engines: CONTINENTAL O-200-A 100 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Kim W. Wood
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, June 25, 1986, 126 hours before
- Departed: U76, MOUNTAIN HOME, ID

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 32; flight instructor, commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: right; flight hours: 327 total, 150 in this make and model, 285 as pilot in command, 49 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 110° at 7 knots
- Visibility: 25 statute miles
- Lowest ceiling: 8,000 ft broken
- Temperature: 55 °F, dew point 36 °F
- Altimeter: 30.00 inHg
- Observed at: MUO, 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 19870212002669A](https://openairdocs.org/incident/19870212002669A), Feb 12, 1987: Cessna 150J, Mountain Home, ID, Substantial damage. The engine lost power shortly after takeoff. Improper maintenance procedures caused rocker arm boss to fracture.

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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