I’ve been told the same. 60’ wide, 50’ deep is the sweet spot for GA hangars.

qmdv wrote:Thi is the wording in the AD

This AD applies to all Continental Motors, Inc. (CMI) model -520 and -550 reciprocating
engines, and to all other CMI engine models approved for the use of model -520 and -550 cylinder
assemblies such as the CMI model -470 when modified by supplemental type certificate (STC), with
Continental Motors Inc., San Antonio (formerly Airmotive Engineering Corp.), replacement parts
manufacturer approval (PMA) cylinder assemblies, marketed by Engine Components International
Division (hereinafter referred to as ECi), part number (P/N) AEC 631397, with ECi Class 71 or Class
76, serial number (S/N) 1 through S/N 61176, installed.

Mechanic says that I have ECI cylinders so he say it applies

Only if your 470 has been converted to a P-Ponk with 520 cylinders... have a customer with one of those engines that the AD applies on...

Brian




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Just got off phone with mechanic. He was confused by the mention of the O470 in the AD. So he shot off a letter to FAA and he got an answer from somebody there that was confused. After a bit of discussion he now has figured it out. My cylinders are just fine.