"Specifically, on a pass play, he lowered his head and struck the opposing quarterback," AFC spokesman Corry Rush wrote in an e-mail.
Ngata slammed into Sanchez with a hit from behind during the second quarter of the Ravens' 34-17 win over the Jets, but no penalty was assessed during the game.
The forced fumble was recovered by outside linebacker Jarret Johnson and returned 26 yards for a touchdown.
For more coverage of the Ravens go to bal.scout.com.
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Ravens Haloti Ngata fined
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