CHI03LA254

NTSB accident investigation · Weatherly 620A · Doland, SD · August 10, 2003

Accident · No injuriesLimited investigationFinal report
Date
August 10, 2003, 14:15 local (19:15 UTC)
Place
Doland, SD
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N4656MWeatherly 620A
Weather
Visual (VMC) · Day
Status
Completed · report March 2, 2004
Report
Approved by Office Director
Parties
FAA- Rapid City FSDO
FAA report
20030810018639A
Case key
57689

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 clearance from the wires and directional control not being possible due to the failure of the brake system. Factors contributing to the accident were the wires, the trees, and the failure of the brake system.

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 objectManeuvering - aerial application
Object - wire,transmissionFactor
Clearance - not maintainedPilot in commandCause
Airframe/component/system failure/malfunctionOther
Landing gear,normal brake system - failureFactor
Loss of control - on ground/waterLanding - roll
Directional control - not possiblePilot in commandCause
On ground/water collision with objectLanding - roll
Object - tree(s)Factor

Analysis

The airplane sustained substantial damage when it veered off the left side of the runway and impacted trees while landing. The pilot reported the airplane struck power lines while performing an aerial application to a field. The airplane remained airborne, and the pilot returned to his private airstrip about seven and a half miles south of the power lines. The pilot reported that the power line had wrapped around the landing gear and tore the brake line to the left and right main landing gear. The pilot stated that while en route to the airstrip he determined the landing gear brakes were not operational due to the impact with the wires.

Factual narrative

On August 10, 2003, at 1415 central daylight time, a Weatherly 620A, N4656M, piloted by a commercial pilot, sustained substantial damage when it impacted trees while landing on runway 30 (2,528 feet by 100 feet, turf) at Hofer Private Airport (SD13), Doland, South Dakota. Visual meteorological conditions prevailed at the time of the accident. The pilot reported no injuries. The 14 CFR Part 137 aerial application flight was not operating on a flight plan. The local aerial application flight originated at 1345.

The pilot reported he struck power lines while performing an aerial application to a field. The airplane remained airborne, and the pilot returned to his private airstrip about seven and a half miles south of the power lines. The pilot reported that the power line had wrapped around the landing gear and tore the brake line to the left and right main landing gears. Prior to the landing, the pilot applied pressure to the brakes and realized the brakes would not be operational during the landing. While landing the airplane veered off the runway and impacted trees.

Aircraft

Registration
N4656M
Reported as
Weatherly 620A
Category
Airplane
Serial number
1540
Airframe hours
2,801
Engine
Pratt & Whitney 985 14-B, 450 horsepower, reciprocating
Damage
Substantial damage
Flight
Aerial application · Part 137
Registered owner
Perry Lee Hofer
Airworthiness certificate
Special, Restricted (Special)
Last inspection
Annual · May 7, 2003 · 300 hours before
Departed
SD13 · Doland, SD
Destination
SD13 · Doland, SD
Airport
SD13 · Hofer Private Airport, runway 12, 2,528 × 100 ft, grass/turf

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
47
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Last flight review
March 29, 2002
Seat
Single
Flight hours
2,000 total · 1,000 in this make and model · 300 in the last 90 days · 90 in the last 30 days · 10 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
360° at 9 knots
Visibility
10 statute miles
Lowest ceiling
3,500 ft overcast
Temperature
77 °F, dew point 64 °F
Altimeter
30.13 inHg
Observed at
HON, 32 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.