O-470's are in fact not included in this AD note, and furthermore, just because you own a TS or Pponk with ECI's doesn't necessarily mean you will be affected either... I happen to own a Pponk that has unaffected ECI's, and happen to be very happy with them.
This is a direct cut and paste of the part and serial numbers from AD note for anyone interested.
This AD applies to the following Continental Motors, Inc. (CMI) models 520 and 550 reciprocating engines, and all other engine models approved for the use of CMI models 520 and 550 cylinder assemblies such as the CMI model 470 when modified by supplemental type certificate (STC), with 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) AEC631397, with ECi Class 71 or Class 76, serial number (S/N) 1 through S/N 33696, or S/N 33697 through S/N 61176, installed on, but not limited to:
(1) IO-520-A, -B, -BA, -BB, -C, -CB, -D, -E, -F, -J, -K, -L, -M, -MB, -N, -NB, and LIO-520-P.
(2) TSIO-520-A, -AE, -AF, -B, -BB, -BE, -C, -CE, -D, -DB, -E, -EB, -G, -H, -J, -JB, -K, -KB, -L, -LB, -M, -N, -NB, -P, -R, -T, -U, -UB, -VB, -WB, and LTSIO-520-AE.
(3) IO-550-A, -B, -C, -D, -E, -F, and -L.
(4) IOF-550-B, -C, -D, -E, -F, and -L.Show citation box
(5) Other engines using CMI models 520 and 550 cylinder assemblies, such as the CMI model 470 when modified by STC.
Having had a non related cylinder failure in flight, my heart aches for anyone else who has had a cylinder failure in flight, having said that, since there is virtually no cylinder manufacturer today who hasn't experienced failures, and since the number of failures on ECI's don't surpass anyone else, I have to agree with the masses of mechanics and professionals who believe this is a classic heavy handed CYA move on the part of the FAA... One more pinch on a failing GA..
Take care, Rob