Atlas B744 at Tokyo on Aug 12th 2024, hydraulic failure, tyre damage on landing

Last Update: August 4, 2025 / 14:22:57 GMT/Zulu time

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Incident Facts

Date of incident
Aug 12, 2024

Classification
Accident

Airline
Atlas Air

Flight number
5Y-7106

Departure
Tokyo Narita, Japan

Destination
Los Angeles, United States

Aircraft Registration
N404KZ

Aircraft Type
Boeing 747-400

ICAO Type Designator
B744

An Atlas Air Boeing 747-400 freighter, registration N404KZ performing flight 5Y-7106 from Tokyo Narita (Japan) to Los Angeles,CA (USA), was climbing through FL140 out of Tokyo's runway 16R when the crew stopped the climb and descended back to FL100 reporting a hydraulic failure. The aircraft entered holds and landed back on Narita's runway 16R about 3.5 hours after departure. Two aft left body gear tyres as well as those wheels were found damaged disabling the aircraft on the runway.

The runway was closed for about 7 hours until the aircraft was moved to the apron.

The aircraft is still on the ground in Tokyo 10 days after landing.

Japan's TSB reported: "The aircraft took off from Narita International Airport at 21:39 on August 12, but immediately afterwards, the aircraft's hydraulic system malfunctioned and the cabin pressure dropped below normal during the flight, leading to the declaration of an emergency and the return flight. The aircraft landed on runway A at the airport at 1:12 on August 13 and stopped on the runway. The runway was closed until the aircraft was moved by a tow truck (until 8:09). An inspection after arrival confirmed that a left main landing gear tire had burst and the aircraft had been damaged." The TSB is investigating the occurrence rated an accident.

On Aug 4th 2025 the JTSB released their final report in Japanese (an English version is to be expected in due time) concluding the probable causes of the accident were:

It is highly probable that this accident occurred when the #7 and #8 tyres were damaged during the aircraft's taxi run. The crew continued takeoff with the main wheels exposed causing fragments of the broken wheels to impact and damage the ceiling pressure bulkhead of the landing gear well.

It is possible that decreasing pressure in the #7 tyre causing an increase in load on the #8 tyre or fragments of the #7 tyre or wheel debris damaged the #8 tyre.

It is possible that #7 tyre lost pressure, however, the cause of that loss of pressure could not be identified.

The JTSB analysed in part that video footage showed the #7 tyre in sync with the #7 wheel along with sounds that appeared to be impacts and pops while taxiing along taxiway A between taxiways W5 and W6, the detached tread also causing damage to the #1 and #4 brake hydraulic systems. During the takeoff run spray like white smoke appeared, it is assumed that the hydraulic system pipes were damaged leading to the subsequent hydraulic malfunction. After the gear was retracted it is presumed that fragments separated and impacted the pressure bulkhead of the main landing gear well.
Aircraft Registration Data
Registration mark
N404KZ
Country of Registration
United States
Date of Registration
E jjAqhbAcniee Subscribe to unlock
Manufacturer
BOEING
Aircraft Model / Type
747-400F
Number of Seats
D Subscribe to unlock
ICAO Aircraft Type
B744
Year of Manufacture
DAjq Subscribe to unlock
Serial Number
Ambpi Subscribe to unlock
Aircraft Address / Mode S Code (HEX)
Fjjbgb Subscribe to unlock
Engine Count
N Subscribe to unlock
Engine Manufacturer
QA Subscribe to unlock
Engine Model
Mcgjpnqcdegfl Subscribe to unlock
Engine Type
Iefemg Ad Subscribe to unlock
Pounds of Thrust
Jndqg Subscribe to unlock
Main Owner
iqbgqnbmmAjdjdgplmcjAlhkfg d pchmkeimAchknbnhfhkpmcllbekcclqecmbgghjlqp pc kggenhg Subscribe to unlock
Incident Facts

Date of incident
Aug 12, 2024

Classification
Accident

Airline
Atlas Air

Flight number
5Y-7106

Departure
Tokyo Narita, Japan

Destination
Los Angeles, United States

Aircraft Registration
N404KZ

Aircraft Type
Boeing 747-400

ICAO Type Designator
B744

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