In the identification number 91-08-07 R1, what does R1 signify?

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Multiple Choice

In the identification number 91-08-07 R1, what does R1 signify?

Explanation:
R1 attached to an Airworthiness Directive identifies the revision level of that directive. The initial part, 91-08-07, indicates the original AD issue date (1991 August 7). When the AD is revised, a suffix starting with R and followed by a number is added to show the revision sequence. So R1 means this is the first revision of that specific AD. If another revision occurs, it would be R2, and so on. This isn’t about the first AD overall, and it doesn’t indicate a year-based revision—it's simply the trackable revision history for that directive.

R1 attached to an Airworthiness Directive identifies the revision level of that directive. The initial part, 91-08-07, indicates the original AD issue date (1991 August 7). When the AD is revised, a suffix starting with R and followed by a number is added to show the revision sequence. So R1 means this is the first revision of that specific AD. If another revision occurs, it would be R2, and so on. This isn’t about the first AD overall, and it doesn’t indicate a year-based revision—it's simply the trackable revision history for that directive.

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