Air India AI 171 Crash in Ahmedabad (4 Viewers)

[Bhartiya Sainik]

I am amazed and amused by your colorful posts.

Entire world, all colorful. Usually these features are used to depict levels of criticality, but i'm amazed & amused that -
- for some people neither the features work nor any multimedia info, after repeated clarification also.
- in everything by default w/o data they see murder & suicide.

May I remind you this is a defence forum, not a children's scrapbook.

May i remind you that this is indeed Defence Forum, not Psychology class to experiment tactics on audience. So start posting something technical.

Be that as it may, any sane person can go through them and find your posts self contradictory.

Speak for yourself. Don't try setting everybody on collision course.
Misunderstandings not good. Discussion should solve confusions, contradictions. Ask politely, you'll get clarification.
Everybody, everywhere is responsible for their own comprehension & contribution.
HOMEWORK BASED posts exploring THEORY more credble than random posts. Rest is upto audience what they wanna derive, conclude, opine, their choice.
I'm low IQ. Higher IQ people are most welcome to share & explain in their way on some verifiable foundation.

Hope this Black & White reply helps.

 

[spikey360]

The only thing you are right about is, in your own words, you are a low IQ. And it shows.

Entire world, all colorful. Usually these features are used to depict levels of criticality, but i'm amazed & amused that -
- for some people neither the features work nor any multimedia info, after repeated clarification also.
- in everything by default w/o data they see murder & suicide.


May i remind you that this is indeed Defence Forum, not Psychology class to experiment tactics on audience. So start posting something technical.


Speak for yourself. Don't try setting everybody on collision course.
Misunderstandings not good. Discussion should solve confusions, contradictions. Ask politely, you'll get clarification.
Everybody, everywhere is responsible for their own comprehension & contribution.
HOMEWORK BASED posts exploring THEORY more credble than random posts. Rest is upto audience what they wanna derive, conclude, opine, their choice.
I'm low IQ. Higher IQ people are most welcome to share & explain in their way on some verifiable foundation.

Hope this Black & White reply helps.

 

[Bhartiya Sainik]

The only thing you are right about is, in your own words, you are a low IQ. And it shows.

Now humbleness is also problem to people like you.
You have problem with everything.
Society needs people of all IQ range for different jobs.
If you are high IQ, like i said, feel free to share stuff on tech aspects, BASED on verifiable things.
But polite presentation matters everywhere - school, college, office, public areas.

 

[Bhartiya Sainik]

I should have checked this long back.
787 fuel system CBT video.


View: https://www.youtube.com/watch?v=HilLkjuJiuo




OBSERVATIONS -
> Total fuel capacity = 101,451 Kgs (67,899 Kgs center + 2x 16,766 Kgs in wings).
> Each tank has 2x AC EMPs (Electric Motor Pumps).
> A single pump can support 1 engine in any condition.
> The 2 center tank pumps are over-ride/jettison pumps. They have higher pressure O/p than L/R wing tank pumps, so that they'll over-ride wing tank pumps & use center tank tank fuel 1st.
> Wing tanks are referred to as main tanks but center tanks used 1st.
> When any wing fuel pump switches off, EICAS messages are displayed with amber color 'PRESS' on overhead buttons.
> When center fuel pump switches off, the EICAS messages are inhibited & no PRESS display on overhead buttons.
> If center fuel pump has low pressure, the EICAS message is displayed with button PRESS light illuminated.
> If low fuel in center tank is displayed in EICAS then center pumps should be switched off.



> When main/wing tanks fuel pumps are on, center tank scavenge pumps t/f any remaining fuel to wings.
> Fuel t/f begins from center to wing when center tank main pumps are off & wing tank quantity drops below 16 tons.
> When wing tank pumps have low pressure then engine can suction feed.
> If engine on suction feed then scavenge pumps are inhibited.
> Suction feed bypasses the wing tank pumps.
> Suction feed at high altitude can cause engine flame outs, irregular thrust, bcoz of dissolved air in fuel is released at lower air pressure.



> If 1 side both fuel pumps become INOP, the other side 2 pumps together can cross-feed.
> Cross-feed is off by default.
> When 1 engine or its generators are INOP then fuel system selects best pumps to continue operation if possible depending upon available electricity.
> Some pumps could be de-prioritized & load-shed, displayed on EICAS display & amber color PRESS on buttons.



> APU fuel can be provided by any AC EMP supplying to left manifold, or left tank DC pump.

DERIVATIONS (not conclusions) -
> This video doesn't seem to say much about FSOVs except states.
> Earlier, many people online spoke of VAPOR-LOCK in fuel pipes due to hot weather, potentially causing engine choking, compressor stall, flame-outs.
> Compressor stall, flame-outs can cause bang noises. The lone survivor said he did hear a bang on T/o.

QUESTIONS -
> Can engines suction feed from center tank which is farther than wing tanks?
> Suction feed at higher altitude can cause flame-out, irregular thrust. What about in hot weather? There are fuel temperature indicators in EICAS dislay but is there any fuel cooling system?
> Bcoz center tank used 1st, crossfeed is off, so if center pump fails then -

- will FMC auto-enage either cross-feed valve or the wing tank pumps?​

- will this cause few seconds of fuel outage causing engine choking/flame-out?​

- Can EEC shut down & re-light engine due to choking?​

> 1st airport CCTV was at very acute angle, shows dust &/or smoke. Can this be due to engine choking?
> The guard shack obstructs the T/o point. Did something happen at this point/time?
> The prelim report gave a screenshot from 2nd CCTV cam but WHY nothing from even many more CCTV cams, nor clarification on this dust or smoke if any?
> There are airport employees sitting in tents on both sides of runways every few 100s of meters, for scaring away birds or whatever reason. Did they see any anomalies with engine?