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-   -   JQ12 Diverts to Guam (https://www.pprune.org/rumours-news/582662-jq12-diverts-guam.html)

Capt Chambo 7th Aug 2016 10:59

JQ12 Diverts to Guam
 
Local Queensland paper reporting that JQ12 a B787, from Tokyo Narita to Coolangata has diverted to Guam after a precautionary engine shutdown.

The article...

Capn Bloggs 7th Aug 2016 11:06

Leave her there.

Andy_S 7th Aug 2016 11:23

Is this really newsworthy?

Kranky 7th Aug 2016 11:59

Well it's in the news so it must be newsworthy.

Capt Fathom 7th Aug 2016 12:04

Because it's in the news doesn't make it worthy.

Today's news is all about subtle (and not so subtle) advertising. Nothing to do with news!

Mike Tee 7th Aug 2016 12:14

If the title of the post does not interest you. Don't read it, easy. Thank's for posting Capt. Chambo.

ACMS 7th Aug 2016 12:25

I can think of worse places to be stuck........

Guam.......like Hawaii run by the Mexicans....

Kranky 7th Aug 2016 12:30

Capt clearly you don't recognize sarcasm.
That said, if it fell out of the sky into the ocean, that would be newsworthy?
Something happened, it was reported. That's news.

Capt Fathom 7th Aug 2016 13:28

Kranky clearly you don't recognise my humour :ok:

Capt Chambo 7th Aug 2016 13:43

The reason I thought the item newsworthy was that it seems to me that there have been a significant number of inflight engine shutdowns, in the B787's relatively short service career.

There are a number of sources for this information, but the following website collates them nicely. (Note, I have no connection with the website, or it's owners, and I am sure that there are other sources available).

By my count there have been more than 20 inflight shutdowns on the B788, most on the GEnx, most related to oil issues, either quantity, or pressure indications. The Rolls Royce Trent also figures of course, and there are a number of instances where no reason for the shutdown is given.

A number of the shutdowns have occurred when the aircraft was most likely in an ETOPS/EDTO sector, and of course the B788 is widely used to fly ETOPS/EDTO routes.

At some stage the number of these shutdowns must become statistically significant!

jack11111 7th Aug 2016 21:17

Guam diversion.
 
ABC Australia News Radio reporting oil pressure issue as cause of the diversion.

tdracer 7th Aug 2016 22:04


The reason I thought the item newsworthy was that it seems to me that there have been a significant number of inflight engine shutdowns, in the B787's relatively short service career.

Capt, you do realize there are over 400 787s currently in service, with something around 5 million total flight hours?

Kranky 7th Aug 2016 23:00

Fathom, you got me.
I got your point about advertising in the news though. So blatant it's sickening.

Bula 8th Aug 2016 06:06

Tdracer,

So with that deduction, that's 7 inflight shutdown I'm aware of...

400 Aircraft, 5 millions Hours.....

Inflight failure rate of 1 Failure every 700 000 ish hours....

That would be an ETOPS failure by the old methods. The thing never would have been certified.

p.j.m 8th Aug 2016 07:16


Originally Posted by Capt Chambo (Post 9465618)
Local Queensland paper reporting that JQ12 a B787, from Tokyo Narita to Coolangata has diverted to Guam after a precautionary engine shutdown.

The article...

Another day, another Jetstar delay or cancellation.

It might be newsworthy if they left and arrived on time!

DaveReidUK 8th Aug 2016 07:28


Originally Posted by Bula (Post 9466540)
So with that deduction, that's 7 inflight shutdown I'm aware of...

400 Aircraft, 5 millions Hours.....

Inflight failure rate of 1 Failure every 700 000 ish hours....

Some shaky maths there. You don't calculate IFSD rate by dividing failures by aircraft flight hours.

beardy 8th Aug 2016 10:04

How is IFSD rate calculated?

tdracer 8th Aug 2016 13:20


Originally Posted by Bula (Post 9466540)
Tdracer,

So with that deduction, that's 7 inflight shutdown I'm aware of...

400 Aircraft, 5 millions Hours.....

Inflight failure rate of 1 Failure every 700 000 ish hours....

That would be an ETOPS failure by the old methods. The thing never would have been certified.

Huh?
First off, IFSD rate is number of shutdowns divided by the number of engine hours, not aircraft hours.
Baseline IFSD rate for 180 minute ETOPS is 0.02 (20/million hours.). Both GEnx and Trent 1000 are several times better than that.

Bula 9th Aug 2016 05:27

Tdracer,

I'm just using your numbers. So that would be IFSD of 1 per 1.4 million hours on the 787 in general.

Anyway, there have been 19 shutdown inflight since 2013, which would make it worse.

So if 400 aircraft have done 5 million hours (10 million engine hours), that would be 1 IFSD every 530000 hours on round figures taking 747-8 hours into account, or am I missing something?

crippen 9th Aug 2016 05:40

There lies
 
https://en.wikipedia.org/wiki/Lies,_...and_statistics

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