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MAX’s Return Delayed by FAA Reevaluation of 737 Safety Procedures

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MAX’s Return Delayed by FAA Reevaluation of 737 Safety Procedures

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Old 19th Aug 2019, 09:22
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Originally Posted by groundbum
https://www.thetimes.co.uk/article/f...737s-x2wk9k2rx

states that 32,000 tickets are on sale on B737 Max's for later on this year at several airlines, including TUI and American Airlines

G
Coverage is paywalled but I saw hard copy yesterday. For all the alarmist tone my reading is simply that no flights are scheduled for MAX until (say) October. Once it's clear grounding will continue beyond that date then flights scheduled for MAX will be cancelled or re-arranged for operation by other types.

Article also states that TUI were only airline to have operated MAX types in UK. Pretty sure that's wrong. May be that all UK registered MAX were TUI (I've not checked) but surely others such as Norwegian were flying them from UK even if on EI or LN register?
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Old 19th Aug 2019, 09:54
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Even if the pilots had been fully briefed about MCAS, its potential failure modes and effects.......
How long would it take to work out that you suddenly had runaway stab trim issues? - whilst you were still struggling to stop a nose-dive? actually not "A" nose-dive but repeated nose-dives?
At the altitude reached, how long would the pilots have then had to work out and implement the correct actions to regain control and avoid terrain?
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Old 19th Aug 2019, 09:56
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Originally Posted by boofhead

I would expect every pilot who takes money for his craft to be able to follow company and manufacturer guidance and especially to be able to follow the QRH/AFM/POH for the aircraft he is flying. If he cannot he should not be allowed anywhere near the seat.
If the two Russian pilots outside Moscow had followed company and manufacturer procedure last week, it is very likely that they and their passengers would not have walked away from the scene.
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Old 19th Aug 2019, 10:00
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Originally Posted by Airbanda
Article also states that TUI were only airline to have operated MAX types in UK. Pretty sure that's wrong. May be that all UK registered MAX were TUI (I've not checked) but surely others such as Norwegian were flying them from UK even if on EI or LN register?
Sloppy journalism - I assume the Times meant to say the only UK-based operator.

Before the grounding, several airlines as well as Norwegian operated MAX flights to/from the UK, including Air Canada, Icelandair and LOT.
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Old 19th Aug 2019, 11:10
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Originally Posted by Bergerie1

And one more to ponder: the Qantas Airbus A380 at Singapore when a turbine disc exploded causing extensive damage and multiple unrelated warnings. In what order should the crew action the various procedures, which should be ignored and which have to be actioned?
In this case ecams or what ever its called, put the a most important checklists in from the FO, if he was doing one and a more important one needed to be done it would remember where he was, goto the more important one and then back to where he was when he finished it

Originally Posted by DaveReidUK
Peter de Crespigny, QF32's captain, reproduced Solon of Athens' 2500-year-old quotation

Ahh yes the legend in his own lunch time, QF milk him for PR but actual qantas people dont have a lot to say about him. The old saying damned by faint praise.
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Old 19th Aug 2019, 11:18
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UK Max operators

Originally Posted by DaveReidUK
Sloppy journalism - I assume the Times meant to say the only UK-based operator.

Before the grounding, several airlines as well as Norwegian operated MAX flights to/from the UK, including Air Canada, Icelandair and LOT.
Yes, I dare say it means TUI/TOM/BY has the only UK registered 737-MAX air frames - All others are foreign -

AFAIK up to the new BA/IAG MAX order (MofU) only UK's Monarch (now defunct) had placed orders for the 737 Max along with TUI
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Old 19th Aug 2019, 12:00
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AA initially cancelled MAX flights from their future schedule for 1 month only, then 3 months only with rolling updates/extensions with a note "Not all flights that were previously scheduled on a MAX will be cancelled. American continues to re-route aircraft throughout our network in order to impact the smallest number of customers".

I'm not sure how much we can read into future schedules which include MAX ops.
Air Canada cancelled thru Jan 2020.
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Old 19th Aug 2019, 12:39
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Just looked at the UK site of TUI Holidays and their Flights pages (plus looked at the UK TUI ''Our fleet'' pages) and any reference to the fact they have the 737 MAX has been quietly airbrushed away from everything.
Even a FAQ search for Boeing 737 Max brings up zilch...


At this time of year their winter flying program (Nov-Apr W19-20) will be settled, and I gather they are not including any of the Max fleet in this schedule (they have 6 Max on the ground and 3 at Boeing awaiting delivery since last May)
The winter program should be well covered by their own 738NG and 757 fleets without any, or much ACMI needed if the Max does not return during the winter - The BY 757's use AFAIK have been extended - but into next summer 2020?

However next summer's program S20 is a different matter to now re-plan and cover - Decisions have to be made now on the capacity needed - If the Max is not back to certify (and maybe likely re-branded) by the end of this year then TUI UK will either have to sort a lot of ACMI again, as seen this season costing £millions. Or, reduce their program of holidays they sell.
The cost to TUI UK just to the end of this season for the ongoing Max debacle has been estimated to be £600m. Ouch.
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Old 19th Aug 2019, 14:03
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How can "the potential difficulty of pilots in rotating the MAX trim wheel" be fixed?

Reportedly, number 1 of 5 concerns raised by EASA about the 737 MAX is:
"The potential difficulty of pilots in rotating the MAX trim wheel".
What are the feasible technical options (and/or certification strategies) available to Boeing in order to tackle that issue?
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Old 19th Aug 2019, 14:18
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Originally Posted by fgrieu

Reportedly, number 1 of 5 concerns raised by EASA about the 737 MAX is:
"The potential difficulty of pilots in rotating the MAX trim wheel".
What are the feasible technical options (and/or certification strategies) available to Boeing in order to tackle that issue?
The three most obvious ones are, a larger diameter wheel (not feasible in current cockpit design), higher gearing (making operation take longer) or some kind of powered assistance (which defeats the idea of a solely human-powered mechanical method of trimming the stabiliser.)
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Old 19th Aug 2019, 14:40
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Originally Posted by boofhead
Here's a novel idea. I doubt it has been considered by too many people, including pilots on this forum:

If you experience low oil pressure you should follow the QRH procedures for low oil pressure. If you experience an engine failure at or after V1, you should follow the QRH procedures for engine failure after V1. If you experience a runway stab trim you should follow the QRH procedures for a runaway stab trim. And so on.

Pretty radical, isn't it?

Note that the MCAS failure presents itself as a runway stab trim so that would mean that, wait for it! You should follow the QRH procedures for runway stab trim! Amazing, yes?
Suggest re-reading the Prelim report on the ET accident

The crew were already dealing with multiple warnings including but not limited to stick shaker, Master Caution Anti-Icing, autopilot disengage prior to the first engagement of MCAS.

The Captain requested reporting of control difficulties to ATC 3 seconds BEFORE MCAS activated.

The suggestion that selecting the runaway trim checklist at this point was simple and straightforward airmanship is hubristic at best.
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Old 19th Aug 2019, 15:10
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Originally Posted by Speed of Sound
The three most obvious ones are, a larger diameter wheel (not feasible in current cockpit design), higher gearing (making operation take longer) or some kind of powered assistance (which defeats the idea of a solely human-powered mechanical method of trimming the stabiliser.)
In designing a fix to that problem, Boeing will be painfully aware that the same issue applies to almost 7,000 in-service NGs.

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Old 19th Aug 2019, 15:35
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I heard a news item on Radio yesterday which should have got my attention but it didn't. What I remember hearing was that a number of customers in the UK have booked flights and, despite being told the Max wouldn't be involved, their bookings have come back as Maxs. I seem to remember one of those people, although in the UK, had booked an American Airlines and his reservation is showing as a Max.
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Old 19th Aug 2019, 15:51
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Originally Posted by KelvinD
I heard a news item on Radio yesterday which should have got my attention but it didn't. What I remember hearing was that a number of customers in the UK have booked flights and, despite being told the Max wouldn't be involved, their bookings have come back as Maxs. I seem to remember one of those people, although in the UK, had booked an American Airlines and his reservation is showing as a Max.
Discussed a few posts up-thread.

Every airline has published its W19 schedules by now - AAL are just guessing/hoping that the Max will be flying again by the end of October.
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Old 19th Aug 2019, 19:23
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Originally Posted by gearlever
Thx Tomaski .One of the best posts ever on PPRuNe
I thought so too.

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Old 19th Aug 2019, 20:19
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Originally Posted by Speed of Sound
The three most obvious ones are, a larger diameter wheel (not feasible in current cockpit design), higher gearing (making operation take longer) or some kind of powered assistance (which defeats the idea of a solely human-powered mechanical method of trimming the stabiliser.)
Either Boeing ensures that the pilots can mechanically overcome an trim runaway, or they ensure that it will newer happen.
The later requires that the Flight Control System for the trim is upgraded to DAL-A.
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Old 19th Aug 2019, 20:41
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Originally Posted by nyt
One wonders why the plane has been grounded for so long with more than one issue to fix then. All to accommodate below average pilots I guess? You're right about human failure though but it lied in the engineering and certification process IMSLFO.
Am I the only one who thinks these planes will never fly again?
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Old 19th Aug 2019, 20:51
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October? Which year!!
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Old 19th Aug 2019, 21:17
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Originally Posted by jugofpropwash
Am I the only one who thinks these planes will never fly again?
If you're correct, you can say goodbye to Boeing - at least as it's existed for the last 100 years. A permanent grounding would cost Boeing north of $100 Billion - not even Boeing could survive that. The only question is would would come out of the resultant bankruptcy.
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Old 19th Aug 2019, 21:31
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Originally Posted by jugofpropwash
Am I the only one who thinks these planes will never fly again?
If the Max is dead in the water, it's hard to see Boeing resurrecting the NG. The result would be Airbus having a de facto monopoly in the 150-200 seat narrowbody market.

That's in nobody's interest, not even Airbus's.

That consideration alone will be enough to ensure that the Max flies again, sooner or later.
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