Originally Posted by kittarbitrary
(Post 29683589)
So these cancellations are as the result of an inspection? That's not very reassuring at all!
I thought they were rotating planes and they were getting to each one in turn, which is why I was thinking they could do it with more forewarning. But there are others around these parts who are more knowledgeable about such matters, so hopefully they can confirm that or not. |
Originally Posted by kittarbitrary
(Post 29683589)
So these cancellations are as the result of an inspection? That's not very reassuring at all!
I thought they were rotating planes and they were getting to each one in turn, which is why I was thinking they could do it with more forewarning. The general yardstick is that BA will try and cancel as early as possible, barring obviously problems on the day. |
I fly this route a lot and I have not been affected yet, which I know it's not much consolation at all if it happens to you. My colleague, who it did affect, got plenty of notice (weeks) and was re-routed to SFO which was a bit of a pain as he departed from SJC which meant he couldn't use his car to get to the airport. A re-route to SFO isn't the end of the world other than the immigration scrum if you don't have global entry, and a little extra commute time if you are actually heading into San Jose.
|
Originally Posted by 13900
(Post 29683689)
I'm sorry, but how else would you know if something needs replacing or not?
My colleague, who it did affect, got plenty of notice (weeks) |
What about KUL..? I guess they would re-route via HKG or SIN for F Class or rebook to MH if they still have Dom P.
|
How far in advance does BA normally publish the cancellations on BA279/BA278?
thanks! |
I wonder if they are paying out EU261 claims.
|
Originally Posted by kittarbitrary
(Post 29683839)
Because surely there would be an inspection of all potentially affected planes immediately, and any problems resolved then, or the aircraft halted until it could be resolved. In fact I thought that was why they grounded planes in January. I didn't expect them to be flying without even having been inspected. Unless you're saying they're all affected and the ongoing inspections are just risk management and they're pulling flights when the damage passes a certain threshold.
The airlines do what is told to them by the Safety regulators, EASA in BA's case. EASA's latest Airworthiness Directive on the case is 2018-0086 and states the following. All bolding are mine. An occurrence was reported where, following N2 vibration and multiple messages, the flight crew performed an engine in-flight shut-down (IFSD) and returned to the departure airport, landing uneventfully. The post-flight borescope inspection of the engine revealed an intermediate pressure turbine blade (IPTB) missing at the shank. Analysis shows that this kind of failure is due to sulphidation corrosion cracking. This condition, if not detected and corrected, could lead to IPTB shank release, possibly resulting in an IFSD and consequent reduced control of the aeroplane. To address this potential unsafe condition, RR issued Alert NMSB Trent 1000 72-AJ575 to provide instructions for engine removal from service when any IPTB with a high level of sulphidation exposure is identified by corrosion fatigue life (CFL) model. Consequently, EASA issued AD 2017-0056 to require removal from service of certain engines, to be corrected in shop. Since that AD was issued, prompted by further occurrences and analyses, it was decided that, to reduce the risk of dual IFSD, a new cyclic life limit must be applied to certain engines [...] Required Action(s) and Compliance Time(s): De-Pairing of Affected Engines: (1) For an aeroplane that has two affected engines installed: Before both engines exceed their respective IPTB cyclic limit, as specified in Appendix 1 of the NMSB at Revision 2, or within 20 flight cycles after the effective date of this AD, whichever occurs later, remove one of the affected engines from the aeroplane. Affected Engine Installation: (2) After removal of an affected engine, as required by paragraph (1) of this AD, do not install that engine on an aeroplane, except within the limitations as specified in Section 3.A of the NMSB. Terminating Action: (3) Modification of an affected engine in accordance with the instructions of RR SB TRENT 1000 72-H818 constitutes terminating action Trent 1000-A, Trent 1000-C, Trent 1000-D, Trent 1000-E, Trent 1000-G, Trent 1000-H, Trent 1000-AE, Trent 1000-CE, Trent 1000-A2, Trent 1000-C2, Trent 1000-D2, Trent 1000-E2, Trent 1000-G2, Trent 1000-H2, Trent 1000-J2, Trent 1000-K2, Trent 1000-L2, Trent 1000-AE2 and Trent 1000-CE2 engines, serial numbers (ESN) as identified in Appendix 1 of the NMSB at Revision 2, except those that have embodied RR Service Bulletin (SB) TRENT 1000 72-H818 in service. |
That really does sound like they should be able to pre-plan the cancellations to me. But never mind, they'll do what they do and we'll just have to wait and see about our flights.
|
The actions required in the Directive are based on cycles (one takeoff/landing is one cycle) and BA (or anyone else) cannot precisely predict aircraft cycles in the longer term. Consider if an aircraft has a (unpredictable) medical diversion and is very delayed on arrival at its destination. Because it diverted it now accumulated 2 cycles instead of the expected one to get to that destination. Meanwhile some other aircraft which was expected to rest overnight at LHR is quickly set up for use to cover the flight the first aircraft should be operating if it wasn't stuck at its destination due to crew rest requirements. The second aircraft also gets another cycle (or two cycles) that was not expected.
If they're both 787s and BA is already short of aircraft, then there might be a cancellation further in the future when the engine of one of those aircraft reaches its cycle limit in the Directive, the engine is taken off and can't be re-used on another aircraft until RR supply parts to fix it. BA might have to run their aircraft very close to the Directive's cycle limit in order not to have even more cancellations - no airline has a lot of spare aircraft to handle some of them going sick. |
|
BA278 is cancelled too. Maybe they are choosing Mondays as last Monday both 278 and 279 were cancelled.
|
Strange that sulphidation is such a life limiting factor on those IP blades. You can generally work around with coatings and temperatures to avoid it.
in saying that Jet A1 from certain countries has high sulphur content. Running the engine in a temperature sweet spot for type 2 corrosion might be something the design guys didn't factor correctly. |
Interestingly, the AD referenced above (AD) only goes into effect on 01May.
So this Trent 1000 mess may be only getting started.... |
Originally Posted by spongenotbob
(Post 29695088)
Interestingly, the AD referenced above (AD) only goes into effect on 01May.
So this Trent 1000 mess may be only getting started.... |
All times are GMT -6. The time now is 3:58 am. |
This site is owned, operated, and maintained by MH Sub I, LLC dba Internet Brands. Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Designated trademarks are the property of their respective owners.