ASN Wikibase Occurrence # 43428
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Date: | Monday 9 January 1995 |
Time: | 17:50 |
Type: | Beechcraft G35 Bonanza |
Owner/operator: | Jose Pineda |
Registration: | N32TS |
MSN: | D-4643 |
Year of manufacture: | 1956 |
Total airframe hrs: | 4116 hours |
Fatalities: | Fatalities: 1 / Occupants: 1 |
Aircraft damage: | Destroyed |
Category: | Accident |
Location: | West Palm Beach, FL -
United States of America
|
Phase: | En route |
Nature: | Private |
Departure airport: | Pahokee, FL (PHK) |
Destination airport: | Wellington, FL |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:The airplane was seen flying erratically, in a rapid descent, with smoke coming from the engine compartment and flames coming from the airplane's right side. Subsequently, the airplane crashed/landed and burned. An investigation revealed that the #1 cylinder had separated from the engine. Examination of the #1 cylinder revealed the upper crankcase thru-bolt at the 10 o'clock position had failed in fatigue below the cylinder deck surface. The lower thru-bolt at the cylinder pad's 8 o'clock position was intact; however, the nut was missing and the threads were battered and polished. The cylinder had 6 deck studs in addition to the thru-bolts. The studs at the 11 and 1 o'clock positions were missing; the studs at the 5 and 7 o'clock positions failed in fatigue; and the studs at the 2 and 4 o'clock positions were fractured with the fractured ends battered. Also, a silicon sealant (RTV) had been used on the thru-bolt threads, though not recommended by the manufacturer. The remaining thru-bolts were examined for tightness using a torque wrench; all were found undertorqued. During a top overhaul of the engine, about 85 flight hours before the accident, all of the cylinders had been removed and reinstalled. CAUSE: Improper top overhaul by maintenance personnel, and improperly torqued crackcase thru-bolts and cylinder deck studs at the number one cylinder, which led to fatigue failure of four of the bolts, failure and/or separation of the number one cylinder, and a subsequent fire.
Sources:
NTSB:
http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001207X02907 Revision history:
Date/time | Contributor | Updates |
24-Oct-2008 10:30 |
ASN archive |
Added |
21-Dec-2016 19:24 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
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