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  1. Replies
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    I suspect Bobby, ALT or VNAV5 would have gone...

    I suspect Bobby, ALT or VNAV5 would have gone around when there was still time.



    1) A standing warning:



    2) A predictive windshear warning (that wasn't even discussed!!).
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    No, don't "close the investigation". Often...

    No, don't "close the investigation". Often investigations reveal other vulnerabilites. I would still recommend:

    1) Exploring the reason for more active control inputs by pilots when in DIRECT law...
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    Once is enough. You don't do that. Unless there...

    Once is enough. You don't do that. Unless there is some overriding reason not to, you go around, out of a minimum requirement of caution. (and you know what that little dot is)

    The report does not...
  4. Right. For asking a question about protocol...

    Right. For asking a question about protocol regarding the in-flight decision to either return or proceed following a potentially damaging event to an engine, where the professional in question...
  5. How so?

    How so?
  6. Do they make one that you can use from the...

    Do they make one that you can use from the cockpit to inspect the hot section of an engine during flight before continuing to destination? I couldn't find that on Google.
  7. Informative, educational and interesting, thanks....

    Informative, educational and interesting, thanks. But one thing we do know, empirically, is that, when the axial flow is disrupted (by insufficient RPM as in a hot start or by aerodynamic stall and...
  8. Is that even possible? Again, a short burst of...

    Is that even possible? Again, a short burst of flame from a surge or two, fine, but 60-90 seconds of continuous flame (i.e lack of sufficient axial airflow, lack of cooling, lack of flame shaping)?...
  9. It's informative, educational and interesting....

    It's informative, educational and interesting. But I'm not calling for "greatly increased temperature monitoring at numerous places within the engine". Whether it's TIT on your P3 or ITT on your King...
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    Preliminary Report Out: PIC: "Nothing to worry about"

    The report is in mostly intelligible English. It reveals a series of pilot errors, poor manual aircraft handling, poor judgement and PIO, but also reveals similar 'overamplitutude' commands from...
  11. But you have a digital temp readout as well, so...

    But you have a digital temp readout as well, so you have an absolute value, right? (BTW, I'm NOT asking about hot start, that was just the precedent I based this on. I'm asking about an in-flight...
  12. This thread. It started as a simple question but...

    This thread. It started as a simple question but I guess nobody has an answer for me.
  13. Sorry, combustor damage, turbine damage, damage.

    Sorry, combustor damage, turbine damage, damage.
  14. The internet really has no idea as to where the...

    The internet really has no idea as to where the limit lies with turbofans, which is why I'm asking the question here on the expertnet, but on turboshaft engines like the PT-6, the internet tells me a...
  15. Isn't this the internet?

    Isn't this the internet?
  16. II suppose it's like medical science, where a...

    II suppose it's like medical science, where a handful of vital signs are used to check for more serious conditions throughout the body. If your four primary engine vital signs are good, there's no...
  17. Ok, but who monitors TIT? I'm talking about...

    Ok, but who monitors TIT? I'm talking about things the crew are alerted to or aware of. The standard indicators in most commercial jets are EPR, EGT, N1 and N2, at best. I'm pointing out that, during...
  18. Hmmm... you must have taken this when you got up...

    Hmmm... you must have taken this when you got up to use the lav...
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    In answer to ATL's question, I'm only complaining...

    In answer to ATL's question, I'm only complaining that this has to happen at all. As to the outcome here, It's promising, because it suggests a willingness to be competitive and a perception that...
  20. If you have a diminished flow of air to the...

    If you have a diminished flow of air to the cumbustors, thus diminished cooling and diminished 'shaping', resulting in excessive heat transfer to that section (and thus a rise in EGT), would the TIT...
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    Well, an alliance implies shared toilets i.e. a...

    Well, an alliance implies shared toilets i.e. a shared responsibility due to an existing voluntary agreement to clean each others toilets when necessary, as a mutually beneficial contingency plan....
  22. Hopefully they at least had some sort of CDU...

    Hopefully they at least had some sort of CDU exceedences maintenance page.



    This article is addressing how to avoid EGT overtemp on take-off, but it illustrates the need to take prolonged...
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    Based on the premise that no man should ever have...

    Based on the premise that no man should ever have to clean another man's toilet.
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    Delta rescues passengers from American Airlines debarcle

    This is what it's come to:

    https://www.businessinsider.de/delta-sends-plane-to-pick-up-stranded-american-airlines-passengers-2019-6?r=US&IR=T
  25. Never felt the urge.

    Never felt the urge.
  26. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&so...

    https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=26&ved=2ahUKEwihzMGn3OfiAhWSyKQKHVIxDTM4FBAWMAV6BAgBEAI&url=https%3A%2F%2Fflightsafety.org%2Ffsd%2Ffsd_mar01.pdf&usg=AOvVaw32yDapTM-nugf3A...
  27. Why don't you put it aside and tell us from...

    Why don't you put it aside and tell us from experience? Is there a point at which the engine is considered compromised and warranting a return or diversion? Is running it back up after that point and...
  28. No, not directly, but the reports suggest this...

    No, not directly, but the reports suggest this was a continuous surge of 1-2 minutes where axial flow would be disrupted but combustion wasn't and was thus flaming out the tailpipe and you would...
  29. I would think it would be as serious as a hot...

    I would think it would be as serious as a hot start on a turbine helicopter. That is generally understood to require a shut down and a subsequent teardown inspection before the engine can be...
  30. Air Zimbabwe 767 Engine Surge, Tailpipe Flames, Mayday... Continues to Destination

    No harm, no foul?

    http://avherald.com/h?article=4c7467ca&opt=0

    So... question: is there an EGT threshold after which you must land asap?
  31. Now they're saying he came in from the Hudson...

    Now they're saying he came in from the Hudson River side:
  32. There's no way he could have landed on that roof....

    There's no way he could have landed on that roof. It's dominated by machinery and structures that most likely wouldn't bear the weight of the helicopter. I'm thinking, at best, he might have tried to...
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    From avherald.com:

    From avherald.com:
  34. I recall the situation with Quantas Flt 32, where...

    I recall the situation with Quantas Flt 32, where the data signal from the thrust levers to the FADEC was severed and the engine remained at its current thrust. I thought it was designed to go to...
  35. I don't think FADEC is a perfect metaphor for...

    I don't think FADEC is a perfect metaphor for flight control systems. There are fewer interdependencies and thus fewer failure ramifications. It is also very robust. On the A320, an ENG 1(2) FADEC A...
  36. I pointed out that the knowledge required to...

    I pointed out that the knowledge required to pilot the aircraft of the present and of the future require a more complex array of traditional airmanship and systems admin expertise. There will be more...
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    Out of curiousity, under what conditions would...

    Out of curiousity, under what conditions would you continue the approach despite the warning?
  38. It has just come to light that the reason Boeing...

    It has just come to light that the reason Boeing engineers didn't realize that the 737-MAX MCAS system had been redesigned without sensor input redundancy was a 'compartmentalized' approach to...
  39. AHA! A bit of the mystery solved. The part...

    AHA!

    A bit of the mystery solved. The part about "what were they thinking?" As it happens, the original MCAS did have sensor redundancy:



    As to the mystery of "what were they thinking at...
  40. Workarounds tend to be the result of some level...

    Workarounds tend to be the result of some level of desperation in adapting an older airframe to a newer reality. The other example of this being the MD-11, which came about when MD realized they...
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