ASN Wikibase Occurrence # 381776
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Date: | Tuesday 7 June 1983 |
Time: | 20:15 LT |
Type: | Airmass Sunburst |
Owner/operator: | Michael Montgomery |
Registration: | UNREG |
MSN: | |
Total airframe hrs: | 1 hours |
Engine model: | CUYUNA 430CC |
Fatalities: | Fatalities: / Occupants: 1 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | Pittsburg, KS -
United States of America
|
Phase: | Initial climb |
Nature: | Unknown |
Departure airport: | |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:THE PLT HAD COMPLETED A PRIVATE PLT GROUND SCHOOL COURSE & HAD FLOWN APRX 4.6 HRS IN A CESSNA 172 BEFORE FLYING HIS HOME BUILT ULTRALIGHT VEHICLE. DURING A TEST FLT, HE WAS MAKING A GO-AROUND FROM A TOUCH-AND-GO LANDING WHEN THE VEHICLE CRASHED. A WITNESS STATED THAT THE ULTRALIGHT PITCHED NOSE DOWN TO ABOUT A 45 DEG ANGLE & THE NOISE OF THE ENG INCREASED AS IT PITCHED DOWN. AN EXAM OF THE WRECKAGE REVEALED THAT THE SHORT ELEVATOR PUSH-PULL ROD HAD SEPARATED FROM THE ELEVATOR CLEVIS FORK. REPORTEDLY, THE HALF NYLOCK LOCKNUT WAS INSTALLED ON THE CONNECTING BOLT IN A REVERSE DIRECTION. THE MANUFACTURER'S ASSEMBLY INSTRUCTIONS DID NOT PROVIDE DETAILS ON THE JAM LOCKING OF THE NUT. ON 10/12/82, THE MANUFACTURER HAD ISSUED SPECIFIC INSTRUCTIONS FOR INSTALLATION OF LOCK NUTS, BUT REPORTEDLY, THESE PROCEDURES WERE NOT APPLIED TO THIS VEHICLE. HOWEVER, THE FAA A&P MECHANICS HANDBOOK (AC65-9A) DISCUSSED PROCEDURES FOR SECURING PUSH-PULL TUBE LINKAGES/FITTINGS/JAMNUTS. MAINT INSTRUCTIONS DO NOT ALWAYS DISCUSS SPECIFIC SAFETY METHODS.
Probable Cause:
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | MKC83FU003 |
Status: | Investigation completed |
Duration: | |
Download report: | Final report |
|
Sources:
NTSB MKC83FU003
Location
Revision history:
Date/time | Contributor | Updates |
02-Apr-2024 07:04 |
ASN Update Bot |
Added |
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