Green-dot,
From memory, on 757 there was an indication light for SPAR VALVE status. That one was amber as long as its physical condition was not in total accordance with commanded request.
I believe such indication light does not exist on 777 (?)
My questions:
How long does a spar valve take from fully closed to fully open ?
What kind of electrical input does it need to operate ?
- Is it a continuous input ?
- Is it just a simple impulse which initiate closure / opening ?
- Can it produce an only partial closure / opening ?
Before going in all kind of studies and theories regarding fuel composition and / or pipe structure, wouldn’t it be common sense to simply test the effect a partial and temporary spar valve closure could produce on HP fuel pump ?
Temporary partial closure of that valve, isn’t it the easiest way to restrict a fuel flow ?
Interesting how our mass media is willing to omit or even change wording … and
therefore format mind of the masses:
BBC
A now-discounted theory was that radio signals from Gordon Brown's motorcade interfered with the Boeing 777… But the report from the Air Accidents Investigation Branch (AAIB)
rules out electromagnetic interference.
When AAIB only says
There is no evidence of any anomalous behavior of any of the aircraft or engine systems that suggests electromagnetic interference
BBC
The plane was operating in what are described as
unusually low temperatures, and one theory is that this affected the fuel, though recorded temperatures were within safe limits.
AAIB words
The Met Office described the temperature conditions during the flight as
‘unusually low compared to the average, but not exceptional’
BBC on may Th