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GAA18CA309

2018-05-19 · Nicolaus, California, United States · None · 1 aircraft · Status: Completed

Current FAA registration · N5128N

Make / Model
AIR TRACTOR INC AT-402A
Year of manufacture
1998 · 20 years old at event
Engine
P&W PT6A SERIES (500 hp)
Seats / Engines
1 seats · 1 engine
Last airworthiness date
19980209
ADS-B equipped
Yes — Mode-S A66C5A

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

Probable cause & findings

The pilot’s failure to maintain adequate clearance from a power transmission wire.

Factual narrative

The pilot reported that, during an aerial application flight, he observed a power transmission wire with no obstructions underneath. He added that he turned around to enter the spray field under the wire, where he observed one wire sagging lower than the other wires. While flying under the power transmission wire, he encountered turbulence, and decided to lower the nose to prevent being pushed into the wire. The tail went up and struck the power transmission wire. The airplane sustained substantial damage to the vertical stabilizer and rudder. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. The pilot reported in the NTSB 6120.1 Form that the wind was calm. The pilot reported that, during an agricultural application flight, he observed a power transmission wire with no obstructions underneath. He added that he turned around to enter the spray field under the wire, where he observed one wire sagging lower than the other wires. While flying under the power transmission wire, the airplane encountered turbulence, so he decided to lower the nose to prevent being pushed into the wire. However, the tail rose up and struck the power transmission wire. The airplane sustained substantial damage to the vertical stabilizer and rudder. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. The pilot reported that the wind was calm. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

FAA avdata. C = Cause, F = Factor.

  • C Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Pitch control-Incorrect use/operation - C
  • C Personnel issues-Psychological-Attention/monitoring-Monitoring environment-Pilot - C
  • C Environmental issues-Physical environment-Object/animal/substance-Wire-Effect on operation - C

Verbatim from NTSB's published report. Source file NTSB_2018_GAA18CA309.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

Related research

Matched on aircraft type or causal vocabulary (turbulence). All research papers