Created Thursday, Mar 16th 2023 20:45Z, last updated Thursday, Mar 16th 2023 20:45Z
A Delta Airlines Boeing 767-400, registration N825MH performing flight
DL-4 from London Heathrow,EN (UK) to New York JFK,NY (USA), was enroute at FL330 about 300nm northeast of Goose Bay,NL (Canada) when the crew observed speed fluctuations on both speed bugs and an increase in airspeed indications. The crew worked the checklists for unreliable airspeed and contacted maintenance. Maintenance recommended to reset the thrust management computer and change the autopilot mode to VNAV. About an hour later the crew observed the same erroneous indications on the right hand primary flight display and a pitch limit indication. The crew worked the related checklists, contacted maintenance again and decided to declare emergency and divert to Bangor,ME (USA). During the descent the crew observed a low hydraulic quantity indication and worked the related checklist. During the approach the crew received a flap asymmetry indication during the flap extension, completed the relevant checklists and continued for a safe landing on Bangor's runway 15 about 2 hours after the onset of trouble.
The Canadian TSB reported maintenance travelled to Bangor and found a hydraulic leak in the pump filter at the left hand engine's pylon. Maintenance further replaced the right hand air data module, the aircraft remains on the ground while the hydraulic leak is being investigated.
The aircraft remained on the ground in Bangor for about 42 hours, then positioned to New York, remained on the ground in New York for another 8 hours before returning to service.
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