What is the difference between the flare angle for aircraft and automotive 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

What is the difference between the flare angle for aircraft and automotive fittings?

Explanation:
The flare angle is the seating angle that forms the seal when the fitting is tightened. Aircraft systems use a 37° flare, while automotive systems use a 45° flare. These are two different standards, and the fittings and nuts are designed to seal with their respective angles. If you mix them, the flare won’t seal properly and leaks or damage can occur. So the statement that aircraft fittings use 37° and automotive fittings use 45° is the correct description.

The flare angle is the seating angle that forms the seal when the fitting is tightened. Aircraft systems use a 37° flare, while automotive systems use a 45° flare. These are two different standards, and the fittings and nuts are designed to seal with their respective angles. If you mix them, the flare won’t seal properly and leaks or damage can occur. So the statement that aircraft fittings use 37° and automotive fittings use 45° is the correct description.

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