# NTSB SEA92LA091: Rockwell S2R, N8803Q, St. John, WA, May 5, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: May 5, 1992, 12:25 local (19:25 UTC)
- Place: St. John, WA
- Coordinates: 47.100021, -117.640182 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.1000&lon=-117.6402&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report August 13, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 41669
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA92LA091
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/41669/pdf
- Page: https://openairdocs.org/ntsb/SEA92LA091

## Probable cause

THE SEPARATION OF THE NUMBER 1 CYLINDER AND REMEDIAL ACTION BY THE PIC NOT POSSIBLE. A FACTOR CONTRIBUTING TO THE ACCIDENT WAS: ROUGH/UNEVEN TERRAIN.

## 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, maneuvering - aerial application
  - engine assembly,cylinder - separation (cause)
- Forced landing, descent - emergency
- Gear collapsed, landing - roll
  - terrain condition - rough/uneven (contributing factor)
  - remedial action - not possible, pilot in command (cause)

## Analysis

DURING A SPRAY RUN THE NUMBER 1 CYLINDER HEAD SEPARATED AND A TOTAL POWER LOSS FOLLOWED. NO PRE EXISTING CRACK WAS REPORTED AT THE POINT OF FAILURE. THE PILOT SET UP FOR A FORCED LANDING IN HILLY, UNEVEN TERRAIN AND DURING THE LANDING ROLL THE AIRCRAFT MOMENTARILY BECAME AIRBORNE AFTER CRESTING A HILL AND THEN PANCAKED INTO THE GROUND.

## Aircraft

- Registration: [N8803Q](https://openairdocs.org/deregistered/N8803Q-2014-12-17), registration cancelled 2014-12-17, S/N 2336R, built 1977 (OpenAirDocs)
- Reported make and model: Rockwell S2R
- Registry model: [Rockwell International S-2R](https://openairdocs.org/model/rockwell-international-s-2r) (registry code 7630202) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 2336R
- Airframe hours: 6216
- Engines: P&W R-1340 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Larmie Aviation, Inc.
- Registered owner: Larmie Aviation, Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, February 29, 1992, 243 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 34; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: front; flight hours: 2,781 total, 636 in this make and model, 250 in the last 90 days, 40 in the last 30 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 25 statute miles
- Lowest ceiling: none
- Temperature: 82 °F, dew point 54 °F
- Altimeter: 30.00 inHg
- Observed at: PUW, 33 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 19920505013289A](https://openairdocs.org/incident/19920505013289A), May 5, 1992: Ayres S2RR1340REST, St Johns, WA, Substantial damage. Crash landed in rough terrain when engine lost power while spraying chemicals. Found NR1 cylinder separated.

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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