GAA17CA360

NTSB accident investigation · Air Tractor AT 502 · Portales, NM · June 22, 2017

Accident · No injuriesData collectionFinal report
Date
June 22, 2017, 16:00 local (22:00 UTC)
Place
Portales, NM
Injuries
1 uninjured
Damage
Destroyed
Phase of flight
Maneuvering
Aircraft
N700LAAir Tractor AT 502
Defining event
Maneuvering-low-alt flying: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report October 31, 2017
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
FAA/ FSDO
FAA report
20170622008589A
Case key
95424

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 decision to fly the airplane under transmission lines while maneuvering at low altitude in high-density altitude conditions, which resulted in subsequent collision with terrain.

Findings · 6

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Not attained/maintainedAir Tractor AT-502B: 19 casesAll aircraft: 1,310 casesProbable cause
Performance/control parameters: heading/courseAircraft › Aircraft oper/perf/capability · Incorrect use/operationAir Tractor AT-502B: 1 caseAll aircraft: 82 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotAir Tractor AT-502B: 22 casesAll aircraft: 9,295 casesProbable cause
Object/animal/substance: wireEnvironmental issues › Physical environment · Effect on operationAir Tractor AT-502B: 15 casesAll aircraft: 588 casesProbable cause
Temp/humidity/pressure: high density altitudeEnvironmental issues › Conditions/weather/phenomena · Effect on operationAir Tractor AT-502B: 3 casesAll aircraft: 278 cases

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The pilot reported that, during an agricultural application flight and while maneuvering at the destination field in a left turn, he realized that the airplane was not going to be able to climb over transmission lines in his flightpath. He added that he lowered the nose to fly under the transmission lines, but the "airspeed was still too low," and the airplane impacted an embankment, slid across the ground for about 100 ft, and nosed over. The airplane was destroyed by the impact and a postcrash fire. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. An automated weather observation station 10 nautical miles north of the accident reported, about 5 minutes before the accident, calm wind, temperature 102°F (39°C), dewpoint 43°F (6°C), and barometric setting of 29.77 inches of mercury. The calculated density altitude was 8,200 ft. According to the Federal Aviation Administration Koch Chart, considering the surrounding temperature and field elevation, the airplane would have likely experienced a 65% decrease in the normal climb rate.

Factual narrative

The pilot reported that, during an aerial application flight while maneuvering at the destination field in a left turn, he realized that the airplane was not going to be able to climb over transmission lines in his flight path. He added that he lowered the nose to fly under the transmission lines, but the "airspeed was still too low" and the airplane impacted an embankment, slid across the ground for about 100 ft., and nosed over. The airplane was destroyed by the impact and a post-crash fire. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. An automated weather observation station, 10 nautical miles north of the accident, about 5 minutes before the accident, reported the wind as calm, temperature 102°F (39°C), dewpoint 43°F (6°C), and barometric setting of 29.77" Hg. The calculated density altitude was 8,200 ft. According to the Federal Aviation Administration Koch Chart, when considering the surrounding temperature and field elevation, the airplane would have likely experienced a 65% decrease in the normal climb rate.

Aircraft

Registration
N700LA
Reported as
Air Tractor AT 502 (B)
Category
Airplane
Serial number
502B-0700
Built
2004
Airframe hours
6,435
Engine
P&W Canada PT6A-34AG, 750 horsepower, turbo prop
Damage
Destroyed
Fire
On-Ground
Flight
Aerial application · Part 137
Operator
King AG Aviation Inc.
Registered owner
King Ag Leasing Inc.
Airworthiness certificate
Special, Restricted (Special)
Last inspection
100 hour · May 17, 2017
Departed
XA05 · Sudan, TX
Destination
XA05 · Sudan, TX
Equipment
Satellite tracking device

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
32
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
July 17, 2016
Seat
Single
Flight hours
2,050 total · 1,326 in this make and model · 1,900 as pilot in command · 75 in the last 90 days · 30 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Temperature
102 °F, dew point 43 °F
Altimeter
29.77 inHg
Observed at
KCVS, 10 nm away

Docket · 2

The files NTSB released with the investigation on September 25, 2017, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.9 MB in all.

FAA reports on this event · 1

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