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(Miho VORTAC)–V54–HKC (Kagoshima VORTAC)–A582–ONC (Erabu VORTAC)–NHC
(Naha VORTAC), DESTINATION AERODROME: Naha Airport, TIME:02:10UTC,
TOTAL EET: 2 hours 42minutes, ENDURANCE: 4 hours 24 minutes.
The said aircraft took off from Niigata Airport at 11:20 with 55 persons on board—49
passengers and six crew members. At around 11:45, while cruising at FL350 over the Sea of
Japan approximately 75km northwest of Toyama City, the pressure altitude of the cabin
(the cabin altitude), which had been maintained at 6,000ft, started to increase. Since this
indicated that the air pressure in the cabin was dropping, the said aircraft made an
emergency decent to a flight altitude of 12,000ft and diverted to Osaka International
Airport, where it landed at 12:25.
(1) The outline of the circumstances of the occurrence of this serious incident based on the
statements of the Captain and First Officer is as follows.
On the day of the incident, the said aircraft was planned to fly two legs: from Osaka
International Airport to Niigata Airport, then from Niigata Airport to Naha Airport.
􀀕
The said aircraft took off from Niigata Airport at 11:20, and the autopilot was
engaged at around 10,000ft. Thereafter, the said aircraft leveled off at FL280 and
FL310 during its climb in accordance with instructions from Tokyo Air Traffic
Control Center before finally reaching FL350.
At around 11:43, while cruising at FL350 around 40nm northwest of TOE
(Toyama VORDME) and cleared direct to JEC (Miho VORTAC), the First Officer,
who was the Pilot Flying, recognized that an aural warning had sounded
accompanied by illumination of the Master Caution. The First Officer confirmed
from the ECAM (Electronic Centralized Aircraft Monitor) display that the gate of
the safety valve of the cabin pressurization system was open and that the cabin
altitude had exceeded the specified limit.
The Captain took over control of the aircraft, promptly decided to make an
emergency decent, and donned his oxygen mask along with the First Officer. The
First Officer confirmed by communication with the cabin crew that the passenger
oxygen masks had dropped automatically, and so did not deploy them manually.
The seat belt signs were also switched on in accordance with the emergency decent
operating procedures.
The Captain deployed the speed brakes and, with the autopilot remaining
engaged, effected a 3,000ft/min descent at airspeed of approximately 260kt. Then,
as a result of the cabin altitude exceeding 13,000ft, he increased airspeed to 300kt
to obtain a greater rate of aircraft descent. The cabin altitude ultimately reached
21,600ft. At an aircraft altitude of around 24,000ft, the Captain confirmed that all
passengers and cabin crew members had donned oxygen masks, and continued
descending at a rate of 2,000ft/min and a cabin altitude descent rate of 1,000ft/min.
The Captain confirmed that the aircraft altitude was less than 13,000ft, and
cancelled the donning of passenger oxygen masks.
Because there was much cloud at around 10,000ft and turbulence had been
forecast, the aircraft cruised at 12,000ft. We decided to divert to Osaka
International Airport, with ATC clearance to this airport.
Although ATC asked about the preparation of firefighting appliances and
ambulances, these were not requested since there was no structural damage to the
aircraft which would have affected landing, and no passengers had experienced
hypoxia or sustained injuries.
The said aircraft landed at Osaka International Airport at around 12:25.
(2) The outline of the circumstances of the occurrence of this serious incident based on the
statements of the cabin crew is as follows.
Cabin crew members experienced unusual feelings in the ears and difficulty in
breathing, but heard no abnormal sounds. The seat belt signs were switched on
􀀖
prior to the emergency decent. The passenger oxygen masks dropped automatically,
so the passengers were instructed to fasten their seat belts and to put the oxygen
masks on. At that time, it was difficult to hear the prerecorded cabin announcement
concerning the oxygen masks and seat belt fastening. Among the passengers, one
person complained of earache and another complained of feeling unwell, but there
were no injured persons.
(3) The outline of the circumstances of the occurrence of this serious incident based on the
statements of passengers is as follows.
Passengers stated that their ears started hurting and that the temperature in the
cabin decreased, then the oxygen masks dropped. They were able to use the oxygen
masks without difficulty since they had watched the pre-takeoff video explaining
　
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