MIAMI (CBSMiami) – A mechanic for American Airlines is facing serious charges after authorities say he attempted to sabotage a plane back in July.

Authorities say Abdul-Majeed Marouf Ahmed Alani is accused of tampering with a crucial navigation system on a jet at Miami International Airport that was about to fly 150 people to the Bahamas.

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CLICK HERE TO READ THE CRIMINAL COMPLAINT IN ITS ENTIRETY

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The flight was aborted when pilots noticed alarms going off.

Alani told investigators he was upset about contract talks between the airline and the mechanics union.

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He will be in federal court on Friday.