PPRuNe Forums - View Single Post - Aircraft destroyed in Afghanistan (USAF E-11A (BACN))
Old 22nd Jan 2021, 10:42
  #90 (permalink)  
Just This Once...
 
Join Date: Apr 2005
Location: UK
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Originally Posted by ORAC
My question, with plenty of height and time and a serviceable engine - why didn’t they manage a relight?
Who knows?

The CVR quit at initial engine failure and the DFDR quit at 1251:29L with the aircraft at FL410. Everything the USAF board publishes in the report beyond that time is little more than guesswork. Having pointed a finger at the sub-optimal EICAS messages to the crew they then go on to display screenshots of the panel display beyond the DFDR-stop point. The screenshot of the EICAS at 1252L showing the Dual Engine Out message is a guess by the mishap board dressed-up to look like actual recorded DFDR data.

I really do have to question the use of 'simulated' data in this way as it is reliant on the system performing in a way that may not be true. The EICAS should have displayed the left engine being shutdown by the FADEC, but it didn't and they know that for a fact as the DFDR recorded it. Post the DFDR-failure the board opines that the EICAS messages and displays were back to being perfect again because they no longer have evidence to show that they were not. Same goes for the AC and DC power switch-over, RAT deployment and correct operation, APU light-up and correct operation, ECS, O2, engine relight attempts and methods et al. These are all presumed on the basis of the normal system logic, crew drills and in case of the RAT and APU, their door positions at final impact.


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