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ASN Wikibase Occurrence # 224673
Last updated: 5 September 2020
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Time:c. 15:05
Type:Silhouette image of generic AT76 model; specific model in this crash may look slightly different
ATR 72-600 (72-212A)
Owner/operator:Mandarin Airlines
Registration: B-16851
C/n / msn: 1460
Fatalities:Fatalities: 0 / Occupants: 55
Other fatalities:0
Aircraft damage: None
Location:near Hualien -   Taiwan
Phase: En route
Nature:Passenger - Scheduled
Departure airport:Kaohsiung International Airport (KHH/RCKH)
Destination airport:Hualien Airport (HUN/RCYU)
Investigating agency: TTSB
Mandarin Airlines flight AE7931, an ATR72-600 aircraft, took off from Kaohsiung Airport at 14:31 for Hualien Airport. During descending, the aircraft experienced cabin altitude anomaly. The flight crew executed an emergency descent and donned oxygen masks. The aircraft safely landed at 15:29. The 6 crewmembers, 1 maintenance personnel and 48 passengers were all safe.

Findings related to probable causes:
Before the aircraft took off from Kaohsiung International Airport, the ground connection check valve might have been malfunctioned and could not be maintained in the fully closed position that caused the connection of the pressurized cabin and atmospheric environment.
While the aircraft descending from cruising altitude, the cabin pressurization system was affected by flight altitude, reduced air intake of the air-conditioning system, and unclosed check valve, failed to provide an appropriate cabin pressure. Consequently, the excessive cabin altitude triggered the cabin altitude waring.


Accident investigation:
Investigating agency: TTSB
Status: Investigation completed
Download report: Final report

Revision history:

03-May-2019 10:51 harro Added
05-Sep-2020 12:12 harro Updated [Narrative, Accident report, ]

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