- Date
- May 5, 1987, 19:15 local (May 6, 1987, 02:15 UTC)
- Place
- Williams, CA
- Injuries
- 1 minor
- Damage
- Substantial damage
- Phase of flight
- Maneuvering
- Aircraft
- N4216XAyres S-2R
- Weather
- Visual (VMC) · Day
- Status
- Completed · report November 29, 1988
- Report
- Approved by Office Director
- FAA report
- 19870505012349A
- Case key
- 25343
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
The plt reported he heard something break. The sound was followed by a vibration. The plt then turned to land on a road. He was unable to maintain alt and airspeed. The rockwell S2R landed in a cultivated field and nosed over after a collision with a dirt bank. Post accident exam of the prop hub assembly revealed that the counterweight bearing shaft was fractured on one of the prop blades. This would allow one prop blade to rotate at a different pitch angle. The rockwell S2R had a two bladed hamilton standard 12D40-305 prop installed. It had been modified in accordance with STC #SP1408NW which replaces the hamilton standard counterweight bearings with midwest aviation rollers.
Aircraft
- Registration
- N4216X
- Reported as
- Ayres S-2R
- Category
- Airplane
- Serial number
- 1973R
- Airframe hours
- 6,616
- Engine
- P&W R-1340-AN-1, 600 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Aerial application · Part 137
- Operator
- Robert B. Caldwell, doing business as Caldwell Flying Service
- Registered owner
- Robert B. Caldwell
- Airworthiness certificate
- Special, Restricted (Special)
- Last inspection
- Annual · April 26, 1987 · 79 hours before
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 36
- Certificate
- Commercial
- Airplane ratings
- Single-engine land
- Instrument ratings
- Airplane
- Medical
- Class 2, Valid Medical--w/ waivers/lim
- Seat
- Center
- Flight hours
- 5,165 total · 5,029 in this make and model · 5,809 as pilot in command · 174 in the last 90 days · 55 in the last 30 days · 10 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- Calm
- Visibility
- 15 statute miles
- Lowest ceiling
- None
- Temperature
- 91 °F, dew point 54 °F
- Altimeter
- 29.00 inHg
- Observed at
- MVY, 30 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.