ATL83LA181

NTSB accident investigation · Pitts S1-SP · Wetumpka, AL · May 8, 1983

Accident · No injuriesLimited investigationFinal report
Date
May 8, 1983, 13:30 local (18:30 UTC)
Place
Wetumpka, AL
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N44GPPitts S1-SP
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
FAA report
19830508018299A
Case key
6062

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

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.

Airframe/component/system failure/malfunctionManeuvering
Wing,wing rib - disintegratedFactor
Aerobatics - performedPilot in commandCause
Acft/equip,inadequate airframeProduction/design personnelCause
Wing,skin - separationFactor
Design stress limits of aircraft - exceededPilot in commandCause
Design stress limits of aircraft - inaccurateProduction/design personnelCause

Analysis

The acft experienced an inflt structural failure of its upper wing during aerobatics in an air show. The acft was landedsafely and the pilot was not injured. The upper wing leading edge ribs reportedly collapsed as the pilot began to pull up at the beginning of an eight-sided loop at about 200 KTS. An FAA observer reported that about 60% of the upper wing fabric then peeled rearward and separated. The pilot 'aborted the show' and landed without further incident. Examination by an FAA inspector and the owner revealed that the leading edge of the upper wing had collapsed rearward tothe front spar with all nose ribs broken. This acft is one of two with 'kermit weeks' wings. The failure described has also happened with the other acft. Both acft upper wings had been constructed of lighter weight materials with emphasis on improved performance. Subsequent to this accident the wing was rebuilt with stronger materials to withstand higher loads.

Aircraft

Registration
N44GP
Reported as
Pitts S1-SP
Category
Airplane, amateur-built
Serial number
001
Airframe hours
385
Engine
Lycoming IO-360, 200 horsepower, reciprocating
Damage
Substantial damage
Flight
Part 91
Registered owner
Clarence G. Parramore
Last inspection
Annual · April 1, 1983
Departed
08A
Airport
08A · Wetumpka Muni., runway 27, 3,000 × 80 ft, asphalt

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
44
Certificates
Commercial, Flight instructor, Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Front
Flight hours
14,812 total · 1,090 in this make and model · 14,512 as pilot in command · 53 in the last 90 days

Weather

Conditions
Visual (VMC) · Day
Wind
180° at 10 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
81 °F

FAA reports on this event · 1

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