Disintegrated Drive Coupling

Unairworthy.

By
Vic Syracuse
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2

disintegratedEver wonder why the standby alternator or vacuum pump isn’t working? There is a drive coupling that is designed to break if something becomes stuck. They are also supposed to be replaced every 500 hours or they can start looking like this!

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2 COMMENTS

  1. last time I looked, the vacuum pump drive spool had a 500hr OR 10 year service life whichever comes first.

  2. Perhaps this is newer data than when you last looked, butTempest has a service letter, SL-001 which recommends replacement every 6 years.
    In our glass cockpits the standby alternaotr seems pretty important. That’s why we recommend 5 years.

    Vic

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