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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Photo of Delta Airlines N825MH, Boeing 767-400 — Delta Airlines N825MH, Boeing 767-400 (Photo credit: markyharky / Flickr / License: CC by)

Incident Facts

Date of incident
Mar 13, 2023

Classification
Incident

Airline
Delta Airlines

Flight number
DL-4

Departure
London Heathrow, United Kingdom

Destination
New York JFK, United States

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

ElhnnhfmpqepeggdA Subscribe to unlock

Manufacturer

BOEING

Aircraft Model / Type

767-432ER

Number of Seats

Akl Subscribe to unlock

ICAO Aircraft Type

B764

Year of Manufacture

Ghkc Subscribe to unlock

Serial Number

FAgnA Subscribe to unlock

Aircraft Address / Mode S Code (HEX)

Qgcnce Subscribe to unlock

Engine Count

Subscribe to unlock

Engine Manufacturer

Lg Subscribe to unlock

Engine Model

Jdiknhimpldjf Subscribe to unlock

Engine Type

Khd jdjAk Subscribe to unlock

Pounds of Thrust

Cn pi Subscribe to unlock

Main Owner

HndecgcjqA gndifqhmkdb lpbikgdglbgmblAnbdAmqffmigkcgkcmjmbdqhekfijbeejifdmch fcnemAkcknbqgmgiqkkAklfdf kgdbqhbhd Subscribe to unlock

Incident Facts

Date of incident
Mar 13, 2023

Classification
Incident

Airline
Delta Airlines

Flight number
DL-4

Departure
London Heathrow, United Kingdom

Destination
New York JFK, United States

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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