"Dave" wrote in message
...

Which volcano eruptions have these Saudi jets been flying through?

The sands of Saudi Arabia. Don't forget, I worked on development from 1978
to 1999 and the Saudi jets were shipped and sorted during that period.

Don't forget that sand is weathered rock not volcanic ash.
Ash is more like moon dust than sand.

the same happens with the engine sensors and various other bits.

The engine sensors are only interested in the air temp into the engine.
There are no other bits.


fuel flow,

Done at the engine, before the high pressure pumps if I recall.

air flow,

Calculated from the speed of the engine when the aircraft was built.
after the aircraft is built and before it makes its first flight, there is
an engine run done that checks the amount of fuel that an engine needs and
this is compared with the engine is sucking through. This is almost a days
work. This is programmed into the engine control unit and stays there
until the engine is changed. The next time this is checked, is when an
engine is changed and the aircraft is subjected to another engine run.

temps,

Taken from the compression area in the engine.

pressures and lots of things.

In the cockpit, there are only NL, NH gauges. These are to tell the crew
what the temperature in the low pressure and high pressure chambers are.

There are lots of bits affected by ash, the turbine blades are one of
them.

Along with, possibly the bearings in that area.

I can't remember what your area of expertise is, but please leave others
to write about theirs.

You have zero expertise in volcanic ash, please don't comment on stuff that
you don't have any experience with.
Especially don't try and pretend sand is the same as volcanic ash,
assumptions like that kill people


Dave