LAX98LA111

NTSB accident investigation · Aeronca 7AC · Lone Pine, CA · March 10, 1998

Accident · No injuriesLimited investigationFinal report
Date
March 10, 1998, 09:00 local (17:00 UTC)
Place
Lone Pine, CA
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N1659EAeronca 7AC
Weather
Visual (VMC) · Day
Status
Completed · report February 15, 2001
Report
Approved by Office Director
FAA report
19980310002889A
Case key
30049

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 failure of maintenance personnel to properly tighten the magneto clamps during installation of the engine on the aircraft following engine overhaul.

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/malfClimb - to cruise
Ignition system,magneto - looseCause
Maintenance,installation - inadequateOther maintenance personnelCause
Ignition system,magneto - twisted
Ignition system - timing improper
Forced landingEmergency descent/landing
On ground/water collision with objectLanding - roll
Terrain condition - high vegetation
Terrain condition - hidden obstruction(s)
Object - tree(s)

Analysis

The pilot reported that as the aircraft climbed through about 3,000 feet agl the engine began to misfire, then lost almost all power. Following an unsuccessful attempt to restore normal engine power, the pilot set up for a glide toward an abandoned airfield. With insufficient altitude to make the airfield, the pilot landed in a pasture and collided with bushes and hidden obstacles in the grass. Both magnetos were found loose in their clamps by technicians from an aircraft recovery firm who retrieved the wreckage. Logbook review disclosed that the engine had accumulated 67 hours since a major overhaul, which was accomplished May 1, 1997. This was the last maintenance recorded in the logbooks.

Factual narrative

On March 10, 1998, at 0900 hours Pacific standard time, an Aeronca 7AC, N1659E, collided with bushes and other obstacles during an off-airport forced landing near Lone Pine, California. The forced landing was precipitated by a loss of power as the aircraft was climbing to cruise altitude. The aircraft was owned and operated by the pilot and was on a personal cross-country flight. Visual meteorological conditions prevailed and no flight plan was filed. The aircraft incurred substantial damage. Neither the pilot nor the one passenger onboard were injured. The flight originated from the Lone Pine airport at 0830 as a cross-country flight to Fresno, California.

The pilot reported in his written statement that as the aircraft climbed through about 3,000 feet agl the engine began to misfire, then lost almost all power. Following an unsuccessful attempt to restore normal engine power, the pilot set up for a glide toward an abandoned airfield. With insufficient altitude to make the airfield, the pilot landed in a pasture and collided with bushes and hidden obstacles in the grass.

Both magnetos were found loose in their clamps by technicians from an aircraft recovery firm who retrieved the wreckage. Logbook review disclosed that the engine had accumulated 67 hours since a major overhaul, which was accomplished May 1, 1997. This was the last maintenance recorded in the logbooks.

Aircraft

Registration
N1659E
Reported as
Aeronca 7AC
Category
Airplane
Serial number
5225
Engine
Continental C-90-8F, 90 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Peter A. Polin
Registered owner
Devil Dusters, Inc.
Airworthiness certificate
Standard, Normal
Last inspection
Annual · May 1, 1997 · 67 hours before
Departed
O26
Destination
FCH · Fresno, CA

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
40
Certificate
Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Front
Flight hours
350 total · 85 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
55 °F, dew point 16 °F
Altimeter
30.00 inHg
Observed at
BIH, 46 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 N1659E · 1

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