FTW94LA145

NTSB accident investigation · Grumman G-164A · El Campo, TX · May 7, 1994

Accident · Serious injuriesLimited investigationFinal report
Date
May 7, 1994, 16:30 local (21:30 UTC)
Place
El Campo, TX
Injuries
1 serious
Damage
Destroyed
Phase of flight
Initial climb
Aircraft
N9682Grumman G-164A
Weather
Visual (VMC) · Day
Status
Completed · report December 7, 1994
Report
Approved by Office Director
FAA report
19940507010279A
Case key
19048

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 partial loss of engine power due to one magneto being weak and the other magneto arcing inside its case. A factor was the lack of suitable terrain for the forced landing.

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(partial) - mech failure/malfTakeoff - initial climb
Ignition system,magneto - deterioratedCause
Ignition system,magneto - arcingCause
Forced landingDescent - emergency
In flight collision with objectDescent - emergency
Object - wire,transmission
Terrain condition - none suitableFactor
In flight collision with terrain/waterDescent - uncontrolled
Aircraft control - not possiblePilot in command

Analysis

A loss of engine power was experienced during initial takeoff climb. During the emergency descent the airplane struck power lines, and descended out of control. The airplane came to rest inverted, and was destroyed by a post impact fire. An examination of the engine revealed no mechanical failures that could have caused the loss of power; however, testing of the magnetos revealed that one was weak and the other was arcing inside its case.

Factual narrative

On May 7, 1994, at 1630 central daylight time, a Grumman G-164A, N9682, was destroyed during a forced landing near El Campo, Texas. The commercial pilot was seriously injured. Visual meteorological conditions prevailed for the aerial application flight.

The pilot reported that during the takeoff initial climb, after turning crosswind, the engine started to lose power. During the emergency descent the airplane struck power lines, and control was lost. The pilot attempted to jettison his chemical load for the forced landing. The pilot further reported that the airplane came to rest inverted, and was destroyed by a post-impact fire.

An examination of the engine revealed no mechanical failures that could have caused the loss of power. However, testing of the magnetos revealed that one was weak and the other magneto was arcing inside its case.

Aircraft

Registration
N9682
Reported as
Grumman G-164A
Category
Airplane
Serial number
1201
Engine
P&W R-1340-AN1, 600 horsepower, reciprocating
Damage
Destroyed
Fire
On-Ground
Flight
Aerial application · Part 137
Registered owner
Grayson Aviation Inc.
Airworthiness certificate
Special, Restricted (Special)

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
39
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Center
Flight hours
3,457 total · 1,600 in this make and model · 1,759 as pilot in command · 200 in the last 90 days · 150 in the last 30 days · 20 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
170° at 12 knots
Visibility
7 statute miles
Lowest ceiling
7,000 ft broken
Temperature
82 °F, dew point 77 °F
Altimeter
29.00 inHg
Observed at
PSX, 50 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.