Delta B764 over Atlantic on Mar 13th 2023, unreliable airspeed, TMC reset in flight and hydraulic leak

Last Update: March 16, 2023 / 20:45:49 GMT/Zulu time

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Incident Facts

Date of incident
Mar 13, 2023

Classification
Incident

Flight number
DL-4

Aircraft Registration
N825MH

Aircraft Type
Boeing 767-400

ICAO Type Designator
B764

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.
Aircraft Registration Data
Registration mark
N825MH
Country of Registration
United States
Date of Registration
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Manufacturer
BOEING
Aircraft Model / Type
767-432ER
Number of Seats
ICAO Aircraft Type
B764
Year of Manufacture
Serial Number
Aircraft Address / Mode S Code (HEX)
Engine Count
Engine Manufacturer
Engine Model
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Engine Type
Pounds of Thrust
Main Owner
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Incident Facts

Date of incident
Mar 13, 2023

Classification
Incident

Flight number
DL-4

Aircraft Registration
N825MH

Aircraft Type
Boeing 767-400

ICAO Type Designator
B764

This article is published under license from Avherald.com. © of text by Avherald.com.
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