Federal Aviation Administration April 11, 2008 – Federal Register Recent Federal Regulation Documents

The FAA proposes to adopt a new airworthiness directive (AD) for certain TCM IO-520, TSIO-520, and IO-550 reciprocating engines with certain SAP cylinder assemblies installed. This proposed AD would require initial and repetitive inspections and compression tests to detect cracks in those cylinders with more than 750 flight hours time- in-service (TIS). This proposed AD results from reports of cracks in the area of the exhaust valve and separation of cylinder heads from the barrels of SAP cylinder assemblies with certain part numbers. We are proposing this AD to prevent separation of the cylinder head, which could result in immediate loss of engine power, possible structural damage to the engine, and possible fire in the engine compartment.

This action proposes to revoke Class E airspace at Luke AFB, Phoenix, AZ. The United States Air Force (USAF) is closing the airport to Instrument Flight Rules (IFR) operations when the control tower is not open.

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

This action corrects a paragraph reference that appeared in the final rule, Airworthiness Standards; Airframe Rules Based on European Joint Aviation Requirements, which the FAA published in the Federal Register on February 9, 1996. In that final rule, the FAA inadvertently changed a paragraph reference. The intent of this action is to correct the error in the regulation to ensure the requirement is clear and accurate.