ATL98LA117

NTSB accident investigation · Air Tractor 401 · Holly Bluff, MS · August 22, 1998

Accident · No injuriesLimited investigationFinal report
Date
August 22, 1998, 11:15 local (16:15 UTC)
Place
Holly Bluff, MS
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N10103Air Tractor 401
Weather
Visual (VMC) · Day
Status
Completed · report June 21, 2000
Report
Approved by Office Director
FAA report
19980822029999A
Case key
43744

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 malfunction of the carburetor which resulted in improper fuel flow to the engine.

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 powerManeuvering - aerial application
Fuel system,carburetor - malfunctionCause
Forced landingDescent - emergency
In flight collision with terrain/waterEmergency descent/landing

Analysis

The pilot reported that he had been flying about forty five minutes on this load of fuel, and estimated that he had in excess of one hour of fuel remaining. While on the first swath run climb out from a field, the engine lost power. The pilot also reported that as the engine lost power, black smoke was seen coming from the exhaust. According to the pilot, the only available emergency landing area was straight ahead. During the post-accident examination of the engine assembly, the engine was started, it ran roughly, and produced black smoke. Further examination disclosed that fuel pressure supplied by the engine driven fuel pump was not being maintained in the pressure carburetor. According to a local mechanic assisting in the examination, the loss of fuel pressure in the carburetor is normally associated with a defective needle assembly in the carburetor. According to the operator, the maintenance records showed that the engine assembly had accumulated 1150 hours of service since the last overhaul. The recommended time between engine overhauls is 1200 hours. The engine maintenance records also failed to show if the carburetor had been overhauled since the last engine overhaul.

Factual narrative

On August 22,1998, at 1115 central daylight time, an Air Tractor 401, N10103, collided with the ground, according to the pilot, during a forced landing near Holly Bluff, Mississippi. The aerial application flight was operated by Producers Flying Inc., under the provisions of Title 14 CFR Part 137 with no flight plan filed. A review of weather data from the nearest reporting facility disclosed that visual weather conditions prevailed at the time of the accident. The airplane received substantial damage. The commercial pilot was not injured. The aerial application flight departed Holly Bluff, Mississippi, at 1030.

The pilot reported that he had been flying about forty five minutes on this load of fuel, and estimated that he had in excess of one hour of fuel remaining. While on the first swath run climb out from a field, the engine lost power. The pilot also reported that as the engine lost power, black smoke was seen coming from the exhaust. According to the pilot, the only available emergency landing area was straight ahead.

During the post-accident examination of the engine assembly, the engine was started, it ran roughly, and produced black smoke. Further examination disclosed that fuel pressure supplied by the engine driven fuel pump was not being maintained in the pressure carburetor. According to a local mechanic assisting in the examination, the loss of fuel pressure in the carburetor is normally associated with a defective needle assembly in the carburetor.

According to the operator, the maintenance records showed that the engine assembly had accumulated 1150 hours of service since the last overhaul. The recommended time between engine overhauls is 1200 hours. The engine maintenance records also failed to show if the carburetor had been overhauled since the last engine overhaul.

Aircraft

Registration
N10103
Reported as
Air Tractor 401
Category
Airplane
Serial number
401-0709
Airframe hours
4,712
Engine
P&W R-1340, 600 horsepower, reciprocating
Damage
Substantial damage
Flight
Aerial application · Part 137
Registered owner
Producers Flying Inc,.
Airworthiness certificate
Special, Restricted (Special)
Last inspection
Annual · March 21, 1998 · 383 hours before
Departed
NONE

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
38
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Front
Flight hours
5,050 total · 175 in this make and model · 300 in the last 90 days

Weather

Conditions
Visual (VMC) · Day
Wind
Variable at 6 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
90 °F, dew point 61 °F
Altimeter
30.00 inHg
Observed at
JAN, 30 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.

Other investigations on N10103 · 1

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