Often an AD will specify an internal part and say it is used in, but not limited to the following engines....
and often it won't. E.g.
This AD applies to fuel injected reciprocating engines manufactured by Lycoming Engines that incorporate externally mounted fuel injection lines (engines with an ''I'' in the prefix of the engine model designation) as listed in the following Table 1
said table listing
IO-360
-A1A, -A1B, -A1B6, -A1B6D, -A1C, -A1D, -A1D6, -A2A, -A2B, -A3B6, -A3B6D, -B1B, -B1D, -B1E, -B1F, -B1G6, -B2F, -B2F6, -B4A, -C1A, -C1B, -C1C, -C1C6, -C1D6, -C1E6, -C1F, -C1G6, -F1A, -J1A6D, -M1B, -L2A, -M1A
No "Y" anywhere in the list. Is it applicable to my engine?
Example: Oil pump gears part #12345 must be replaced within xxx hrs. These gears are used in, but not limited to the following engines.... If these gears are used in your engine, the AD applies. The gears are not immune to failure just because they are not in a certified engine.
I agree with this...if it uses the words "not limited to", it's basically saying this part must be replaced regardless of what engine it may be installed on. Absent this or similar wording, though...?
Addition point, Let's say the AD didn't "legally" apply by "letter of the law".
Can you legally sign off a condition inspection stating that "This aircraft was found to be in a condition for safe operation" knowing there is an unsafe set of gears in the oil pump?
Not my question...Can I legally sign off a condition inspection stating the same after looking at the AD I quoted above, if I chose not to do what the AD said? (Note I didn't say what's in the AD...
)