ASN Wikibase Occurrence # 223675
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| Date: | Friday 29 March 2019 |
| Time: | 09:05 UTC |
| Type: |  Boeing 787-8 Dreamliner |
| Owner/operator: | Jetstar Airways |
| Registration: | VH-VKJ |
| MSN: | 36236/278 |
| Year of manufacture: | 2015 |
| Fatalities: | Fatalities: 0 / Occupants: |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | near Osaka-Kansai International Airport -
 Japan
|
| Phase: | Approach |
| Nature: | Passenger - Scheduled |
| Departure airport: | Cairns Airport, QLD (CNS/YBCS) |
| Osaka-Kansai International Airport (KIX/RJBB) | |
| Investigating agency: | JTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
At approximately 15,000 feet during descent into Kansai International Airport, Osaka, Japan, the flight crew of Jetstar Airways flight JQ15 received an engine thrust warning on the number 2 engine, which subsequently started to surge. The crew then received an engine fail indication on the number 1 engine, without any shift in parameters indicating any engine power loss.
That warning was followed by an engine fail warning on the number 2 engine. The number 2 engine auto relight activated and the engine continued to surge during the descent.
High concentrations of biocide in outer tanks resulted in magnesium salt residue jamming fuel controls at low fuel flows, so both engines momentarily dropped below idle of descent.
PROBABLE CAUSES:
In this serious incident, it is highly probable that, when the Aircraft was descending for landing, there occurred oscillation in rpm of each engine causing both engines to temporarily fall below idle at separate times because Residue primarily composed of magnesium salts accumulated in spools impeded movement of spools that involved in fuel metering of both engines.
As for the higher accumulation of Residue primarily composed magnesium salts in spools, it is somewhat likely that the fuel with a higher concentration ratio of biocide, which was loaded in the biocide treatment two days before the serious incident, did not mixed evenly with the remaining fuel in wing tanks, and was fed to the engines.
Accident investigation:
 |
|
Sources:
https://mainichi.jp/english/articles/20190403/p2g/00m/0bu/002000c
https://www.atsb.gov.au/publications/investigation_reports/2019/aair/ae-2019-016/
https://www.smh.com.au/business/companies/jetstar-787-suffers-problems-with-both-engines-on-approach-to-osaka-20190327-p5183s.html
http://aerossurance.com/safety-management/jetstar-b787-genx-biocide
https://jtsb.mlit.go.jp/jtsb/aircraft/detail2.php?id=2235
https://www.mlit.go.jp/jtsb/eng-air_report/VHVKJ.pdf
https://www.flightradar24.com/data/aircraft/vh-vkj#1ff78570
Images:
Media:
#Jetstar #Boeing 787 GEnx-1B Serious Incident
— Aerossurance (@Aerossurance) June 25, 2020
High #biocide concentrations in outer tanks resulted in residue jamming fuel controls at low fuel flows, so both engines momentarily dropped below idle during descent.https://t.co/Ej2d5U5blW#flightsafety #aviationsafety #JTSB pic.twitter.com/q6JoIg6EvM
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-Apr-2019 07:45 | mtchastain | Added |
| 03-Apr-2019 07:47 | harro | Updated [Time, Cn, Nature, Departure airport, Destination airport, Source, Narrative] |
| 03-Apr-2019 07:50 | harro | Updated [Location, Source, Narrative] |
| 03-Apr-2019 10:57 | harro | Updated [Photo] |
| 25-Jun-2020 11:10 | Aerossurance | Updated [Source, Narrative] |
| 25-Jun-2020 11:19 | Aerossurance | Updated [Embed code, Narrative] |
| 24-Jul-2020 12:35 | harro | Updated [Embed code, Narrative, Accident report, ] |
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