# NTSB CHI93DEE01: Mark Streitz Skybolt, N94MS, Joliet, IL, June 5, 1993 - Type: NTSB accident investigation - Classification: Accident · No injuries · Final report - Date: June 5, 1993, 14:00 local (19:00 UTC) - Place: Joliet, IL - Coordinates: 41.549869, -88.130332 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=41.5499&lon=-88.1303&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report October 20, 1994 - Report: Approved by Office Director - NTSB case key (mKey): 9136 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI93DEE01 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/9136/pdf - Page: https://openairdocs.org/ntsb/CHI93DEE01 ## Probable cause the failure of the number two connecting rod bolt. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(total) - mech failure/malf, cruise - engine assembly,connecting rod bolt - failure,total (cause) - engine assembly,connecting rod - fractured - Forced landing, descent - emergency - Nose over, landing - flare/touchdown - terrain condition - soft ## 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](https://openairdocs.org/deregistered/N94MS-2002-10-10), registration cancelled 2002-10-10, S/N MS1, built 1986 (OpenAirDocs) - Reported make and model: MARK STREITZ SKYBOLT - Registry model: [Streitz M/Steen SKYBOLT](https://openairdocs.org/model/streitz-m-steen-skybolt) (registry code 056227T) (OpenAirDocs) - Registry engine: [Lycoming HIO-360 series](https://openairdocs.org/engine/lycoming-hio-360-series) (registry code 41524, reciprocating) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: MS1 - Airframe hours: 73 - Engines: 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 ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 31; 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 (OpenAirDocs). - [Accident 19930605016889A](https://openairdocs.org/incident/19930605016889A), Jun 5, 1993: Amtrsn SKYBOLT, Joliet, IL, Substantial damage. Lost power. Nosed over on forced landing. Found broken connecting rod. From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.