B757 Undifferentiated or Other Model
Confusion
Ground Event / Encounter Aircraft
Aircraft Aircraft Damaged; General Maintenance Action
Equipment / Tooling
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.
The reporter stated that corrosion was discovered in some electrical component shorting the controls. The unnamed component was located outside of jetbridge control and accessible only to Maintenance Personnel. In this event a B757 was parked at the gate and the door hinges were damaged by jetbridge contact.
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.