Dreamliner Down in India

[pdw]

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[pdw]

Without any WX indications EAST of the airport perimeter it’s harder to perceive that these two extra performance decreases are combining there. If using maximum available ‘derated’, there are then three compounding decreased performance effects that are adding up:


(1)The Derate

(2)The increase in temp with height as opposed to a normal decrease expected.
And keeping in mind here even “fixated on the OAT gauge” would still be latent by a degree-or-two/second-or-two

(3)Any amount of the ‘negative low level wind shear’ itself, almost perfectly reciprocal … the opposing directions either side of a low level transition.

( next will clarify what I actually meant by “confuse” … which is most difficult, tricky)

[cdnavater]

Without any WX indications EAST of the airport perimeter it’s harder to perceive that these two extra performance decreases are combining there. If using maximum available ‘derated’, there are then three compounding decreased performance effects that are adding up:


(1)The Derate

(2)The increase in temp with height as opposed to a normal decrease expected.
And keeping in mind here even “fixated on the OAT gauge” would still be latent by a degree-or-two/second-or-two

(3)Any amount of the ‘negative low level wind shear’ itself, almost perfectly reciprocal … the opposing directions either side of a low level transition.

( next will clarify what I actually meant by “confuse” … which is most difficult, tricky)

Who in the @#$! is “fixated” on the OAT gauge, Jesus, this proves in a single sentence that you have no idea what we do up front!
The loss of thrust would be felt immediately and the reaction would be to reference the airspeed indicator to prevent a stall, there is no fixating, I 100% doubt either pilot would have even looked at the OAT, we simply would not care at this point!
I am done with this, you continue to astound me with your lack of knowledge n operation of an aircraft!!!

[pdw]

I should have quoted that “fixated” better … 5 or so posts back someone I think was seriously teasing the issue in their particular context. It was not you! Yes, better leave it … getting a bit much.

One thing I forgot to mention was that over the years studying this topic of inversion shears it has come clear to me that the lack of references for a surface analysis (forensically after the fact or for the pilots checking their WX beforehand) in one direction or another (in this case data abscent toward east) has been the common denominator that I’ve noticed most … at least in a lot of the cases/synopses I became interested in.

[TeePeeCreeper]

I should have quoted that “fixated” better … 5 or so posts back someone I think was seriously teasing the issue in their particular context. It was not you! Yes, better leave it … getting a bit much.

One thing I forgot to mention was that over the years studying this topic of inversion shears it has come clear to me that the lack of references for a surface analysis (forensically after the fact or for the pilots checking their WX beforehand) in one direction or another (in this case data abscent toward east) has been the common denominator that I’ve noticed most … at least in a lot of the cases/synopses I became interested in.

What?

[pdw]

Data IS available toward southwest. WEATHER STATION 0310 (ISANAN 83) located on rwy heading approx 15-20nm beyond rwy 23 departure end. That’s “Wundermap”. The only other really useful station I found west of this takeoff is THALTEJ Ahmedabad IAHED42 Jai Ambe Nagar which is about 4-5 NM WNW of the tragedy site.

Except for WX-interpolation via distant stations to the East, there are none that I could find that were within a more reasonable proximity.

[JeppsOnFire]

Core characteristics:
Social Communication: Difficulty with back-and-forth conversation, understanding nonverbal cues, and sharing interests.
Repetitive Behaviors: Engaging in repetitive movements, repeating words, or having strict routines.
Sensory Differences: Being overwhelmed by or seeking out specific sounds, lights, textures, or smells.
Intense Interests: Deep, focused interests in particular subjects or objects.
Learning & Movement: Different ways of learning, paying attention, or moving.

Maybe it's just the way he his. I have a family member who behaves a lot like PDW.

I think it's a real dude.
Wind is his jam.
Carry on everyone.

[SpyPilot]

My jam is PC Blue Menu Twice the Fruit Strawberry & Rhubarb.

[CL-Skadoo!]

Core characteristics:
Social Communication: Difficulty with back-and-forth conversation, understanding nonverbal cues, and sharing interests.
Repetitive Behaviors: Engaging in repetitive movements, repeating words, or having strict routines.
Sensory Differences: Being overwhelmed by or seeking out specific sounds, lights, textures, or smells.
Intense Interests: Deep, focused interests in particular subjects or objects.
Learning & Movement: Different ways of learning, paying attention, or moving.

Maybe it's just the way he his. I have a family member who behaves a lot like PDW.

I think it's a real dude.
Wind is his jam.
Carry on everyone.

Incredibly intelligent and spot on! P used to drop by our local airport a fair bit. A kind and gentle person. He has specific topics that bring him a ton of joy and passion!

[pdw]

Groundspeed increase per second at least triples at lift-off.

Where’s all the extra power coming from to do that?

With prelim numbers works out to just-above 1.5kts ‘groundspeed increase per second’ for each of the 6 seconds prior to liftoff, then 6kts per second for each of the 3 seconds immediately following liftoff.

Apr20
RE: New info APRIL 12 … Q: Is it possible a FADEC/EEC can command deploying the RAT (ie in disconnecting high draw of buses for power) 1/2 sec past liftoff to try spooling higher rpm quicker during an unforesee-able/catastrophic LLWS-related performance-loss while in max-derated takeoff ?

In event of too-abrupt an engine acceleration (engines nearer to stall proximity), FADECs supposedly can also manage avoidance for a single/dual compressor stall, which one might imagine takes pilots by surprise if EEC-commanded power reduction is a part of that process. Consider earlier weather history interpolation discussion in this thread, via historical surface analysis of Vaah-area showing potential for neg LLWS-influence on performance at this takeoff accident location/time, where such escalated excess power deployment could have occurred so engine’s compressor blades closer to stalling angle.