ASN Wikibase Occurrence # 186543
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| Date: | Sunday 17 April 2016 |
| Time: | 16:49 |
| Type: |  Boeing 737-809 (WL) |
| Owner/operator: | China Airlines |
| Registration: | B-18609 |
| MSN: | 28407/161 |
| Year of manufacture: | 1998 |
| Fatalities: | Fatalities: 0 / Occupants: 122 |
| Aircraft damage: | None |
| Category: | Incident |
| Location: | 180nm northwest of Guam -
 Guam
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Guam International Airport (GUM/PGUM) |
| Taiwan Taoyuan International Airport (TPE/RCTP) | |
| Investigating agency: | ASC |
| Confidence Rating: |  Accident investigation report completed and information captured |
China Airlines flight CI025 turned back to Guam International Airport after a cabin pressurisation issue.
After the aircraft, a Boeing 737-800, climbed up to an altitude of 37,000 feet, a caution message "Auto Fail/Unscheduled Pressurization Change" showed up on the instrument panel. The flight crew then performed manual control procedures according to the Quick Reference Handbook. The abnormal cabin altitude persited, forcing the flight crew to immediately perform an emergency descent and turn back to Guam. A safe landing was made on runway 06R about 40 minutes later.
Findings published by the ASC:
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 the risks: During the Operator's so-called "the contents of the Fault Isolation Manual is incomplete" event happene [sic: happening?], the Aircraft On Ground team did not contact the Boeing for professional and effective recommendations. After the end of rescue [sic: repair?], 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.
Four safety recommendations were raised.
Accident investigation:
 |
|
Sources:
https://www.guampdn.com/story/news/2016/04/17/cabin-pressure-failure-causes-air-return-china-air/83152878/?from=new-cookie
https://www.asc.gov.tw/main_ch/docDetail.aspx?uid=227&pid=227&docid=749
flightradar24.com/data/flights/ci25/#970165a
https://www.asc.gov.tw/main_en/docaccident.aspx?acd_no=210&uid=344&pid=296
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Apr-2016 15:12 | AF5541 | Added |
| 18-Apr-2016 15:14 | harro | Updated [Source, Narrative] |
| 18-Apr-2016 15:15 | harro | Updated [Registration] |
| 09-Jun-2016 04:14 | AF5541 | Updated [Destination airport] |
| 04-Jun-2017 07:45 | harro | Updated [Narrative] |
| 04-Jun-2017 07:50 | harro | Updated [Time] |
| 04-Jun-2017 18:03 | Aerossurance | Updated [Source, Narrative] |
Corrections or additions? ... Edit this accident description
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