GAA15CA096

NTSB accident investigation · Aero Vodochody L39 · Grand Junction, CO · May 28, 2015

Accident · No injuriesData collectionFinal report
Date
May 28, 2015, 12:25 local (18:25 UTC)
Place
Grand Junction, CO
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N6175CAero Vodochody L39
Defining event
Enroute: Low altitude operation/event
Weather
Visual (VMC) · Day
Status
Completed · report August 12, 2015
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
FAA
FAA report
20150528007389A
Case key
91257

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 inadequate preflight planning and subsequent failure to remain clear of power line wires while maneuvering at low altitude.

Findings · 3

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.

Planning/preparation: flight planning/navigationPersonnel issues › Task performance · PilotAll aircraft: 179 casesProbable cause
Object/animal/substance: wireEnvironmental issues › Physical environment · Awareness of conditionAll aircraft: 588 casesProbable cause
Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Not attained/maintainedAll aircraft: 1,310 casesProbable cause

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

According to the pilot, while flying over a river at an altitude of about 100 feet above water and ground level, at 250 knots, the airplane impacted unmarked power line wires that spanned the river. The power line wires are clearly identified on the Visual Flight Rules Sectional Aeronautical Chart. The pilot immediately established a climb and returned to the airport without further incident. The airplane sustained substantial damage to the nose, left wing, and vertical stabilizer. The pilot reported that there were no pre-impact mechanical failures or malfunctions that would have precluded normal operation.

Factual narrative

According to the pilot, while flying over a river at an altitude of about 100 feet above water and ground level, at 250 knots, the airplane impacted unmarked power line wires that spanned the river. The power line wires are clearly identified on the Visual Flight Rules Sectional Aeronautical Chart. The pilot immediately established a climb and returned to the airport without further incident. The airplane sustained substantial damage to the nose, left wing, and vertical stabilizer. The pilot reported that there were no pre-impact mechanical failures or malfunctions that would have precluded normal operation.

Aircraft

Registration
N6175C
Reported as
Aero Vodochody L39 (C)
Category
Airplane
Serial number
432942
Built
1984
Engine
Ivchenko AI-25TL, 3,800 horsepower, turbo fan
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · September 9, 2014 · 32 hours before
Departed
GJT · Grand Junction, CO
Destination
GCK · Garden City, KS
Flight plan
VFR
Equipment
Handheld GPS

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
45
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
October 5, 2014
Seat
Front
Restraint
4-point
Flight hours
2,944.8 total · 458.6 in this make and model · 2,902.5 as pilot in command · 135.6 in the last 90 days · 94.5 in the last 30 days · 37 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
68 °F, dew point 46 °F
Altimeter
30.11 inHg
Observed at
GJT, 12 nm away

Docket · 4

The files NTSB released with the investigation on August 10, 2015, on NTSB’s docket system: statements, records, photos and specialists’ reports. 6.9 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.