[f-AA] FW: brain cramp - AD 95-05-05 ?

[Arecit]

Howdie doodied Mr. Bob,

Hey, you never did tell me what happened to Mr. Snake?  Will you be around in early December.  Might be over that way.

Take care and good luck in your search; I don't remember if you found a new airplane yet.

Oh--- it's celebratory time-- hurricane season is over.

Safe skies and swamps,
Suzie, Nancie and Bill's ratty, clankitty, J5-A (Jerry)



In a message dated 11/04/06 08:15:17 Eastern Standard Time, MEHON at ewol.com writes:
I'm impressed with this lazy biologist !
----- Original Message ----- 
From: Arecit 
To: aeronca at westmont.edu 
Sent: Friday, November 03, 2006 3:54 PM
Subject: Re: [f-AA] FW: brain cramp - AD 95-05-05 ?


Hi Mike,

Being a lazy biologist sort I tried a quick 'google' of "Rocker shaft boss" and this unfortunate NTSB report turned up, but it also quickly identified the specific AD also (under the full narrative link).  Nancie



"Airworthiness Directive (AD) 94-05-05 R1, published in 1994, was issued to prevent possible engine power loss and subsequent engine failure. The AD required that maintenance personnel inspect the cylinder rocker shaft bosses for cracks at the next cylinder removal from the engine or engine overhaul, whichever occurs first, after the effective date of the AD. A revised AD became effective in 1996."  

Taken from:

NTSB Identification: NYC03LA137. 
The docket is stored in the Docket Management System (DMS). Please contact Records Management Division 
14 CFR Part 91: General Aviation
Accident occurred Thursday, June 26, 2003 in Williamson, NY
Probable Cause Approval Date: 9/1/2004
Aircraft: Cessna 150F, registration: N8517G
Injuries: 2 Uninjured.
As the airplane was climbing, with the student pilot at the controls, the engine began to run rough. The certified flight instructor (CFI) took over the controls and elected to perform a forced landing to an apple orchard. During the forced landing, the left and right wings struck trees. The airplane came to rest upright. Examination of the engine revealed a fractured cylinder rocker shaft boss to the number one cylinder. The fracture was consistent with fatigue. An Airworthiness Directive, published in 1994, was issued to prevent possible engine power loss and subsequent engine failure. The AD required that maintenance personnel inspect the cylinder rocker shaft bosses for cracks at the next cylinder removal from the engine or engine overhaul, whichever occurs first, after the effective date of the AD. A revised AD became effective in 1996. Review of the airplane's engine maintenance records indicated that the last engine overhaul and cylinder removal was accomplished in 197
 7. 
The National Transportation Safety Board determines the probable cause(s) of this accident as follows: 
The failure of a rocker arm shaft boss, which resulted in a partial loss of power and subsequent forced landing. A factor was the unsuitable terrain. 
Full narrative available
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