China Airlines B738 near Guam on Apr 17th 2016, loss of cabin pressure
Last Update: June 5, 2017 / 15:10:09 GMT/Zulu time
The flight was cancelled.
A replacement Boeing 737-800 registration B-18656 reached Taipei the following morning with a delay of 13 hours.
Taiwan's ASC reported they have dispatched investigators to Guam to investigate the circumstances of the cabin pressure control exception resulting in the release of the passenger oxygen masks after the aircraft had climbed to FL370. The aircraft carried 109 passengers, 3 flight crew and 10 cabin crew. The occurrence was rated an accident.
On Jun 5th 2017 the ASC released their final report in Chinese and executive summary concluding the probable cause of the accident (maintaining the rating as accident) was:
Findings related to probable causes
- A gear pin of cabin pressure system outflow valve was broken so that the outflow valve could not be controlled which resulted in abnormal cabin pressure and air turned back to Guam.
Findings related to risk
- During the Operator's so-called “the contents of the Fault Isolation Manual is incomplete” event happened, the Aircraft On Ground team did not contact the Boeing for professional and effective recommendations. After the end of rescue, the team did not actively inquire about the cause of failure message during troubleshooting.
This indicates that the China Airlines should implement the execution of maintenance management rules.
The ASC reported that climbing through 27300 feet the crew received indications that the cabin pressure control AUTO and ALTN modes had failed, the crew switched to manual control, determined that the cabin pressure was controllable and continued the climb to FL370. After levelling off at FL370 the crew detected that the cabin altitude was still climbing at about 500 fpm, initiated an emergency descent to FL100 and returned to Guam.
This article is published under license from Avherald.com. © of text by Avherald.com.
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