For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998.  The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Teledyne Continental Motors Piston Engines


Superior Air Parts - Cast Cylinder Assemblies

4/2007 TX



Teledyne Continental Motors (TCM) 470, 520, and 550 series reciprocating engines fitted with PMA cast cylinder assemblies manufactured by Superior Air Parts (SAP) with the following part numbers (P/Ns):

SA47000L-A1, SA47000L-A20P, SA47000S-A1, SA47000S-A20P,
SA47000S-A21P, SA52000-A1, SA52000-A20P, SA52000-A21P, SA52000-A22P, SA52000-A23P, SA55000-A1 or SA55000-A20P.

These P/N cylinder assemblies may be installed in the following TCM engine models:

·      O-470 -G, -K, -L, -M, -P, -R, -S, -U

·      IO-470 -C, -D, -E, -F, -G, -H, -L, -M, -N, -P, -R, -S, -U, -V

·      IO-520 -A, B, BA, C, CB, D, E, F, J, K, L, M, BB, MB

·      TSIO-520 -AF, B, BB, C, CE, D, DB, E, EB, G, H, J, JB, K, KB, L, LB, M, N, NB, P, -R, T, UB, VB, WB

·      IO-550 -A, B, C, D, E, F, L

Note 1:  A complete list of aircraft models, applicable TCM engines might be installed on, but not limited to, may be found in FAA Airworthiness Directive


1.    Check records to determine the P/N of the cylinder assemblies installed during engine overhaul or repair.  If the records do not list the P/N of the cylinder assemblies, visually inspect the cylinders.

If your engine is fitted with affected cast cylinder assemblies P/N identified in the applicability list of the AD, check the serial numbers (S/N) of the cylinder assemblies.





Remove all cylinder assemblies with the following serial numbers, all inclusive:

·          47LE053559 through 47LF053643, or

·          47SE054212 through 47SF054251, or

·          52D0531708 through 52H0532197, or

·          55E05223 through 55G05289, or

·          32WE059006 through 32WF059067, or

·          32WHE05379 through 32WHE05392, or

·          326WF055517 through 326WF055532, or

·          36TWF05430 through 36TWG05453, or

·          36WF058058 through 36WJ058182, or

·          366WE056944 through 366WL058131.

Note 2:  Superior Air Parts Mandatory Service Bulletin (MSB) B06-01 Revision E dated 24 January 2007 pertains to the subject of this AD.

2.    Do not install any cylinder assembly with part numbers and serial numbers identified in Requirement 1 of this AD, into any engine.

Note 3:  FAA AD 2007-04-19 Amendment 39-14951 dated 13 February 2007 refers.


1.    Before cylinder assemblies reach 150 hours TIS.

Note 4:  For aircraft with engine cylinder assemblies that have greater than 150 hours TIS special flight permits may be issued to ferry the aircraft to a maintenance base.

2.    After the effective date of this AD.


This Airworthiness Directive becomes effective on 2 March 2007.









This AD results from discovery of nine separated SAP cylinder assemblies installed in TCM 470, 520, and 550 series reciprocating engines and one separated SAP cylinder assembly installed in Lycoming Engines 320, 360, and 540 series engines.  CASA is issuing this AD to prevent cylinder separation that can lead to engine failure, a possible engine compartment fire, and damage to the airplane.

David Punshon
Delegate of the Civil Aviation Safety Authority

28 February 2007