Air India 787 crashes on take off 2

[LittleInch]

A full 787-8 has crashed shortly after take off in ahmedabad.

Basically barely got off the ground then look like its trying to land in this video.

Air India flight to London Gatwick crashes in Ahmedabad with more than 240 people onboard – latest updates

Plane for flight AI171 was carrying 242 people including 169 Indians and 53 Britons, says Air India

www.theguardian.com

Specualtion that they pulled flaps up instead of gear up and basically didn't have enough lift so it looks like a gentle stall right into a built up area.

Looks to be flaps up, slats/ nose flaps down and gear down which is very odd.

 

[Garbage1]

So power goes down to CCS, and everything shuts down.

The Boeing 787 Dreamliner employs a revolutionary architecture called the Common Core System (CCS). This centralized system replaces the traditional approach of dedicated electronics for each aircraft function. Within the CCS, two critical components are the Common Computing Resource (CCR) cabinets.

• Each CCR cabinet houses eight GPMs. These modules are the workhorses of the CCS, acting as independent computing platforms.
• Examples of functions hosted by GPMs include:
  • Remote Power Distribution System (RPDS)
  • Generator/Bus Power Control Unit (GCU/BPCU)
  • Landing Gear Indication and Control
  • Thrust Management Function
  • Flight Management Function

Boeing 787 Common Core System (CCS) : A Technical Breakdown - Online Aviation Training

The Boeing 787 Dreamliner employs a revolutionary architecture called the Common Core System (CCS). This centralized system replaces the traditional approach of dedicated electronics for each aircraft function. Within the CCS, two critical components are the Common Computing Resource (CCR)...

oat.aero

 

[TugboatEng]

A diesel engine can set the pump to zero delivery even while the engine is running such as during coasting. Maybe this isn't such a good idea for a turbine engine. I wonder how minimum fuel is set vs no fuel.

Starving a pump for fuel isn't such a wise idea so I imagine the normal shutdown is performed with the FMU and not via supply valves.

We're having trouble with the marine engines where any fault with the engine control module power results in an immediate shutdown with no stored fault even.

Diaphragm pumps in automotive fuel systems typically have a pair of rubber flaps that serve as suction and discharge check valves. In the flat head Ford days these would have been nitrile rubber and short lived if exposed to the temperatures atop the engine. They would behave very similarly to a diaphragm pump pumping vapor.

 

[Garbage1]

After reviewing a service bulletin on the FMU, I agree all fuel flow control is contained in the FMU.

Training Doc on FMU. Have not read yet but looks interesting.

https://ia600108.us.archive.org/16/items/b787-meav-type-1-training-manual/ATA%2073%20Engine%20-%20Fuel%20and%20Control.pdf

 

[TugboatEng]

Right away, this part of the diagram shows a spring shut valve held open by a normally closed switch. A loss of electrical power would cause an engine shutdown if this is true. It also shows two pressure sources for a shut off?



This may not be the only way the FMU can cause a shutdown, either. If the metering valves can move to a zero position they can also cause a shutdown.

Also note that the engine has a permanent magnet alternator producing 28V DC to run the FMU. That might rule this out as a source of dual engine shutdown.