Narrative:

Auto leveler malfunctioned and did not alarm. Jetbride began rising on its own while auto leveler was in the on position and no alarm was ringing.

Google
 

Original NASA ASRS Text

Title: A jetbridge rose damaging a B757's door hinges after the auto leveler failed in the ON position because of corrosion in a control mechanism.

Narrative: Auto leveler malfunctioned and did not alarm. Jetbride began rising on its own while auto leveler was in the ON position and no alarm was ringing.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.