MIA01LA150

NTSB accident investigation · Air Tractor AT-502B · Fort Pierce, FL · May 31, 2001

Accident · Minor injuriesLimited investigationFinal report
Date
May 31, 2001, 08:00 local (12:00 UTC)
Place
Fort Pierce, FL
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N6067AAir Tractor AT-502B
Weather
Visual (VMC) · Day
Status
Completed · report April 1, 2003
Report
Approved by Office Director
Parties
FAA FSDO
FAA report
20010531027869A
Case key
52393

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 loss of engine power during takeoff/initial climb due to compressor turbine blade separation.

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.

Loss of engine power(total) - mech failure/malfTakeoff - initial climb
Turbine assembly,turbine blade - separation
Forced landingEmergency descent/landing
In flight collision with objectEmergency landing after takeoff
Object - tree(s)

Analysis

The pilot stated that he had just taken off from the Southeastern Crop Service's private field, and he was about 100 feet in the air, when he heard a loud bang, and saw pieces coming out of the tailpipe. The pilot further stated that he then initiated a forced landing to an orange grove, and during the landing the airplane collided with trees and incurred substantial damage. An FAA inspector and a representative from Pratt and Whitney Canada, Montreal, Canada, conducted on-scene and follow-up examinations of the accident airplane. According to the Pratt and Whitney Canada representative, examination of the engine showed no sign of preimpact damage to the reduction gear box. In addition, the Pratt and Whitney Canada representative further stated that both the downstream damage, as well as the damage to the compressor turbine shroud were consistent with there having been a high energy impact due to compressor turbine blade fragments. The operator later provided portions of the engine to the NTSB after having first sent them to a laboratory he had contracted to conduct his own analysis. The NTSB conducted an examination of the engine parts the operator provided at the NTSB's Metallurgical Laboratory, Washington DC., and the examination showed the presence of damage consistent with overstress separations in cast materials.

Factual narrative

On May 31, 2001, about 0800 eastern daylight time, an Air Tractor AT-502B, N6067A, registered to, and operated by Southeastern Aircraft Inc, as a Title 14 CFR Part 137 agricultural flight, crashed immediately after takeoff from a private field in Fort Pierce, Florida. Visual meteorological conditions prevailed, and no flight plan was filed. The airplane incurred substantial damage, and the commercial-rated pilot received minor injuries. The flight was originating at the time of the accident.

The pilot stated that he had just taken off from the Southeastern Crop Service's private field, and he was about 100 feet in the air, when he heard a loud bang, and saw pieces coming out of the tailpipe. The pilot further stated that he then initiated a forced landing to an orange grove, and during the landing the airplane collided with trees and incurred substantial damage.

An FAA inspector and a representative from Pratt and Whitney Canada, Montreal, Canada, responded to the accident site and conducted on-scene and follow-up examinations of the accident airplane. According to the Pratt and Whitney Canada representative, examination of the engine showed no sign of preimpact damage to the reduction gear box. In addition, the Pratt and Whitney Canada representative further stated that both the downstream damage, as well as the damage to the compressor turbine shroud were consistent with there having been a high energy impact due to compressor turbine blade fragments. The Pratt and Whitney Canada representative adding that fractured PMA compressor turbine blades had been found in the engine.

The operator later provided portions of the engine to the NTSB after having first sent them to a laboratory he had contracted to conduct his own analysis. The NTSB conducted an examination of the engine parts the operator provided at the NTSB's Metallurgical Laboratory, Washington, D.C., and the examination showed the presence of damage consistent with overstress separations in cast materials.

Aircraft

Registration
N6067A
Reported as
Air Tractor AT-502B
Category
Airplane
Serial number
502B-0245
Airframe hours
3,021.3
Engine
Pratt-Whitney PT6A-34AG, 750 horsepower, turbo prop
Damage
Substantial damage
Flight
Aerial application · Part 137
Registered owner
Southeastern Aircraft Inc.
Airworthiness certificate
Special, Restricted (Special)
Last inspection
100 hour · April 5, 2001 · 69 hours before
Departed
FD30 · Fort Pierce, FL
Airport
FD30 · Southestern Airport

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
70
Injuries
Minor
Certificate
Commercial
Airplane ratings
Multi-engine land, Single-engine land, Single-engine sea
Instrument ratings
Airplane
Medical
Class 2, Unknown
Last flight review
March 2, 2000
Seat
Single
Flight hours
30,000 total · 6,000 in this make and model · 30,000 as pilot in command · 122 in the last 90 days · 37 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
0° at 2 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
72 °F, dew point 68 °F
Altimeter
29.89 inHg
Observed at
FPR

FAA reports on this event · 1

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