# NTSB SEA86LA152: Rockwell S2R, N4973X, Caldwell, ID, June 25, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 25, 1986, 06:15 local (12:15 UTC)
- Place: Caldwell, ID
- Coordinates: 43.660682, -116.629852 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.6607&lon=-116.6299&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 40428
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA86LA152
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40428/pdf
- Page: https://openairdocs.org/ntsb/SEA86LA152

## Sequence of events

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

- Miscellaneous/other, takeoff - initial climb
  - removal of control/gust lock(s) - not performed, pilot in command (cause)
  - aircraft preflight - disregarded, pilot in command (cause)
- Loss of control - in flight, go-around (vfr)
  - aircraft handling - not possible, pilot in command
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

SHORTLY AFTER DEPARTURE THE PILOT COULD NOT GET ANY AILERON RESPONSE. A LANDING WAS ATTEMPTED AT A NEARBY AIRPORT WHERE A GO AROUND BECAME NECESSARY. DURING THE GO AROUND CONTROL OF THE AIRCRAFT WAS LOST AND IT DESCENDED TO GROUND IMPACT. INVESTIGATION DISCLOSED THE PILOT FAILED TO REMOVE THE CONTROL LOCK PRIOR TO FLIGHT.

## Aircraft

- Registration: [N4973X](https://openairdocs.org/deregistered/N4973X-2015-05-19), registration cancelled 2015-05-19, S/N 5018R, built 1975 (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: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs)
- Category: Airplane
- Serial number: 5018R
- Airframe hours: 1315
- Engines: WRIGHT R-1300B 600 horsepower reciprocating
- Damage: Destroyed
- Flight: Aerial application, Part 137
- Operator: Davidson Air Service
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, June 12, 1986
- Departed: 64U, CALDWELL, ID
- Airport: U35, Caldwell Industrial, runway 30, 7,000 × 60 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 48; flight instructor, commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 10,500 total, 6,000 in this make and model, 10,500 as pilot in command, 170 in the last 90 days, 7 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 64 °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 19860625027739A](https://openairdocs.org/incident/19860625027739A), Jun 25, 1986: Ayres S2RRESTD, Caldwell, ID, Destroyed. Pilot lost control of aircraft during go around due to loss of aileron control. Pilot failed to remove control lock.

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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