LAX08CA034

NTSB accident investigation · Air Tractor AT-401 · Soledad, CA · December 6, 2007

Accident · Serious injuriesData collectionFinal report
Date
December 6, 2007, 10:30 local (18:30 UTC)
Place
Soledad, CA
Injuries
1 serious
Damage
Destroyed
Phase of flight
Maneuvering
Aircraft
N6024MAir Tractor AT-401
Weather
Visual (VMC) · Day
Status
Completed · report January 31, 2008
Report
Approved by Office Director
Parties
Federal Aviation Administration
FAA report
20071206828499A
Case key
67215

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The pilot's failure to maintain an adequate clearance from mountainous terrain while maneuvering during an aerial application mission. Contributing to the accident was the pilot's diverted attention inside the cockpit.

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.

In flight collision with terrain/waterManeuvering - aerial application
In-flight planning/decision - inadequatePilot in commandCause
Diverted attentionPilot in commandFactor
Terrain condition - mountainous/hilly
Clearance - not maintainedPilot in commandCause

Analysis

The pilot was seeding an area located adjacent to mountainous terrain. Prior to making the first pass, he had flown a reconnaissance flight to inspect the area. After completion of the first pass as he was maneuvering in a turn back towards the field, he was checking the seeding pattern and making adjustments to the GPS system inside the cockpit. When he checked the gauges again, he realized that the airplane had lost airspeed and rolled out to a wings level configuration to regain the lost airspeed. The airplane was headed towards rising terrain. He jettisoned the remaining seed and made a controlled collision with terrain in a ravine. The airplane was destroyed in a post impact fire. He reported that he had preoccupied himself with less important flight duties at a critical time during the flight. The pilot reported no mechanical problems that would have precluded normal operation.

Factual narrative

According to the pilot, he departed from King City, California, airport about 1000 for a seeding flight mission west of the Soledad, California. After performing a reconnaissance flight over the area, he made his first application pass heading towards the west. During this time he was also visually checking the seeding pattern and making adjustments to the GPS application equipment located inside the airplane. After completion of the first pass, he initiated a turn and noted that his airspeed had slowed during the first pass. He was not able to complete the turn, and "rolled" back to wings level flight. He added full power and checked the engine gauges. The pilot stated that he believed he would be able to regain sufficient airspeed to complete his turn and continued straight ahead. He stated that his direction of flight was towards a canyon with "rapidly rising terrain."

The pilot stated that as soon as he maneuvered back to wings level flight, he was rapidly approaching the rising terrain, and he was not going to be able to "climb or out maneuver" the terrain. He immediately released the emergency dump handle to jettison the remaining seed from the hopper. While jettisoning the seed, he also chose the best possible location for an emergency landing. The pilot's next memory was of fire and smoke; he was able to extricate himself from the wreckage.

In the pilot's written submission to the Safety Board (NTSB Form 6120.1; Pilot/Operator Aircraft Accident/Incident Report), in the section titled RECOMMENDATION (How could this accident/incident have been prevented), the pilot stated that he had preoccupied himself with other, "less important flight duties at a critical time when all focus should have been outside the cockpit verifying that my chosen flight path could be maintained." The pilot reported no mechanical malfunctions that would have precluded normal operation.

According to a responding Battalion Chief from the California Department of Forestry, the airplane flew into a box canyon and was not able to turn around. The airplane struck several trees and impacted in a ravine near an old Jeep road, and was destroyed in the post impact fire.

Aircraft

Registration
N6024M
Reported as
Air Tractor AT-401
Category
Airplane
Serial number
401-0949
Engine
Pratt & Whitney R1340, 600 horsepower, reciprocating
Damage
Destroyed
Fire
On-Ground
Flight
Aerial application · Part 137
Operator
Soilserv Inc
Registered owner
US Bancorp Equipment Finance Inc.
Airworthiness certificate
Special, Restricted (Special)
Departed
KIC · King City, CA
Destination
KIC

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
40
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2
Last flight review
October 1, 2007
Seat
Center
Flight hours
11,000 total · 240 in this make and model · 10,740 as pilot in command · 300 in the last 90 days · 40 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
50 °F

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.

Other investigations on N6024M · 1

Matched to the same aircraft by N-number and date.