- Date
- June 5, 1993, 14:00 local (19:00 UTC)
- Place
- Joliet, IL
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N94MSMark Streitz Skybolt
- Weather
- Visual (VMC) · Day
- Status
- Completed · report October 20, 1994
- Report
- Approved by Office Director
- FAA report
- 19930605016889A
- Case key
- 9136
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
the failure of the number two connecting rod bolt.
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.
Analysis
The pilot reported that soon after reaching cruising altitude, the amateur built airplane lost engine power. He immediately turned towards his departure airport to attempt an emergency landing. After realizing that he would not be able to return to the airport, the pilot elected to land on an open, soft field. The airplane subsequently nosed over during the landing roll. Postaccident examination of the engine revealed that the #2 connecting rod and rod bolt had fractured.
Factual narrative
History of flight
On June 5, 1993, about 1400 central daylight time, a Steen Skybolt, N94MS, registered to Mark S. Streitz, 3429 West Ridge Road, Joliet, Illinois, experienced a catastrophic engine failure while on a pleasure flight. An emergency landing in a soft wet corn field was made with substantial damage to the aircraft. Visual meteorological conditions prevailed at the time. No flight plan was filed. The private pilot had no injuries. The flight originated at Joliet Park District Airport, Joliet, Illinois, at 1345 hours.
Injuries to persons
The private pilot reported no injuries.
Damage to aircraft
The aircraft was substantially damaged by crash impact forces. Upper and lower wings, tail section, nose cowl, fuselage, and gears show heavy damage.
Crew information
The pilot holds a private license and has 377 total flight hours.
Aircraft information
The airplane is a Steen Skybolt, serial number MS1, manufactured in 1986. The aircraft was in storage until purchased by Mr. Mark S. Streitz in January 1993. The Lycoming engine HIO-360-B1A, serial number L-4834-51A was originally installed in a Hughes helicopter. The engine was purchased used, time in service unknown, and major overhauled January 29, 1982. One each used connecting rod was installed at this overhaul.
The engine was assembled and test run on June 2, 1984.
The aircraft and engine were removed from storage on May 27, 1991. It was noted in the engine log books that the engine was ground run every 3 or 4 months since the major overhaul.
The aircraft was given an annual inspection on April 2, 1993, with a total time of 45.9 hours.
The aircraft had 73.1 hours total time at the time of the accident.
Test and research
Inspection of the Lycoming HIO-360-B1A engine revealed a broken connecting rod #2. Connecting rod bolt, part number 75061 fractured allowing the connecting rod to disengage from the crankshaft journal.
It could not be determined if new connecting rod bolts were installed at the last engine overhaul.
Aircraft
- Registration
- N94MS
- Reported as
- Mark Streitz Skybolt
- Category
- Airplane, amateur-built
- Serial number
- MS1
- Airframe hours
- 73
- Engine
- Lycoming IO-360-B1A, 180 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Operator
- Mark S. Streitz
- Registered owner
- Mark S. Streitz
- Airworthiness certificate
- Special, Experimental (Special)
- Last inspection
- Annual · April 2, 1993 · 31 hours before
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
- 31
- Certificate
- Private
- Airplane ratings
- Single-engine land
- Medical
- Class 3, Valid Medical--no waivers/lim.
- Seat
- Center
- Flight hours
- 377 total · 60 in this make and model · 288 as pilot in command · 34 in the last 90 days · 19 in the last 30 days · 1 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Temperature
- 72 °F
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.