Timothy Garroutte

Paragraphs (i) Replacement, (3), (i) throgh (Vii). These paragraphs require the inspections to be completed by a specific Maintenance Manual Chapter 4 Revision (with date). This will cause confusion for maintenance personel when the manuals are updated with a newer revision and date. Cessna Customer Support receives calls from maintenance personel requesting old revsions of a manual due to ADs requireing an exact revision. Old revisions are not available. Instead of a spacific revision number, the AD should state the current revision or XX revision or higher. As an example: Current (i) Subject 4-11-00, Replacement Time Limits, of Chapter 4, Airworthiness Limitations, Revision 10, dated April 23, 2012, of the Cessna Model 550, -0801 and On Maintenance Manual. Suggested (i) Subject 4-11-00, Replacement Time Limits, of Chapter 4, Airworthiness Limitations, Revision 10 or higher, dated April 23, 2012 or later, of the Cessna Model 550, -0801 and On Maintenance Manual. Other Suggestion: (i) Subject 4-11-00, Replacement Time Limits, of Chapter 4, Airworthiness Limitations, Current Revision, dated April 23, 2012 or later, of the Cessna Model 550, -0801 and On Maintenance Manual. One of these suggestions should be applied to paragraphs (i) through (Vii) where specific revision numbers and dates are mentioned.