How tight should an MS flareless fitting be tightened?

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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 tight should an MS flareless fitting be tightened?

Explanation:
MS flareless fittings create a seal by the compression of a sleeve as the nut is tightened after hand snug. Once you reach hand snug, give it a small final turn to seat the sleeve properly. Too little beyond hand snug may leave the seal incomplete and allow leaks; too much can over-compress or deform the sleeve and risk damage to the fitting or tube. The recommended final step is a light additional rotation of about 1/6 to 1/3 turn beyond hand snug, which provides a reliable seal without over-torquing. After tightening, check for leaks under pressure per procedure.

MS flareless fittings create a seal by the compression of a sleeve as the nut is tightened after hand snug. Once you reach hand snug, give it a small final turn to seat the sleeve properly. Too little beyond hand snug may leave the seal incomplete and allow leaks; too much can over-compress or deform the sleeve and risk damage to the fitting or tube. The recommended final step is a light additional rotation of about 1/6 to 1/3 turn beyond hand snug, which provides a reliable seal without over-torquing. After tightening, check for leaks under pressure per procedure.

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