How can you distinguish AN fluid line fittings from AC fittings?

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Prepare for the ASA Aviation Maintenance Technician General Test. Utilize flashcards and multiple-choice questions with hints and explanations. Ace your exam!

Multiple Choice

How can you distinguish AN fluid line fittings from AC fittings?

Explanation:
The key clue is the presence of a shoulder between the end of the flare cone and the first thread on AN fluid line fittings. That shoulder acts as a stop and provides a seating surface for the flare to seal against the nut face when tightened. AC fittings normally do not have this shoulder, so you won’t see that distinct step where the flare ends before the threads begin. By looking for that shoulder, you can reliably tell AN fittings from AC fittings.

The key clue is the presence of a shoulder between the end of the flare cone and the first thread on AN fluid line fittings. That shoulder acts as a stop and provides a seating surface for the flare to seal against the nut face when tightened. AC fittings normally do not have this shoulder, so you won’t see that distinct step where the flare ends before the threads begin. By looking for that shoulder, you can reliably tell AN fittings from AC fittings.

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