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NTSB Report
July 7, 1984 · Gillmore MONI · N157LG
Joliet, IL
Overview
Report Status
Preliminary report
Event Type
Accident
Date
July 7, 1984
Injury Outcomes
No injuries (1 uninjured)
Location
Joliet, IL
Aircraft
Gillmore MONI
Tail Number
N157LG
Injuries
None
Aircraft Damage
Substantial
NTSB Number
CHI84LA286
THE PROP SEPARATED FROM THE ACFT AT APRX 500 FT AGL DURING THE INITIAL TAKEOFF CLIMB. A FORCED LANDING WAS MADE IN A CORN FIELD. THE PROP WAS ATTACHED BY MEANS OF 4 5/16 INCH BOLTS AND RETAINING NUTS. TWO OF THE FOUR BOLT PORTIONS REMAINING AFTER THE ACCIDENT WERE REMOVED. ONE OF WHICH WAS TESTED AND PROGRESSIVE FATIGUE WAS FOUND. THE KIT MANUFACTURER LATER ISSUED A SERVICE BULLETIN STATING THAT WITH THE NUTS PROPERLY TORQUED IT IS POSSIBLE FOR THE NUTS TO BOTTOM OUT ON THE BOLT THREADS WHICH WOULD RESULT IN THE BOLTS SHEARING. THE MANUFACTURER SUGGESTS INSTALLING WASHERS AT THE HEAD OF THE BOLT TO PREVENT THE NUT FROM BOTTOMING OUT.
Full Narrative
THE PROP SEPARATED FROM THE ACFT AT APRX 500 FT AGL DURING THE INITIAL TAKEOFF CLIMB. A FORCED LANDING WAS MADE IN A CORN FIELD. THE PROP WAS ATTACHED BY MEANS OF 4 5/16 INCH BOLTS AND RETAINING NUTS. TWO OF THE FOUR BOLT PORTIONS REMAINING AFTER THE ACCIDENT WERE REMOVED. ONE OF WHICH WAS TESTED AND PROGRESSIVE FATIGUE WAS FOUND. THE KIT MANUFACTURER LATER ISSUED A SERVICE BULLETIN STATING THAT WITH THE NUTS PROPERLY TORQUED IT IS POSSIBLE FOR THE NUTS TO BOTTOM OUT ON THE BOLT THREADS WHICH WOULD RESULT IN THE BOLTS SHEARING. THE MANUFACTURER SUGGESTS INSTALLING WASHERS AT THE HEAD OF THE BOLT TO PREVENT THE NUT FROM BOTTOMING OUT.
Flight
Event TypeAccident
Event Time16:00 CDT
Nearest AirportWILHELMI (0nm N)
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftGillmore MONI
Tail NumberN157LG
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsKfm · 107E · Reciprocating · 35
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 37 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind80° @ 8 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point70 F / 45 C
Altimeter29.00 inHg
Observation Time19:50
Weather SourceWFAC