Re: Break the VSI?

Date:         23 Nov 96 03:36:26 
From:         dswisher@mcfly.sanders.lockheed.com (Douglas Swisher)
References:   1 2
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Just in the vain of talking about alternate sources of airspeed, it
occurred to me that there is are two sources of static pressure on the
757 that were working correctly and that they might even have been on the
data bus.  I'm talking about the ambient pressure and total pressure at
the engine inlet.  Granted that these are influenced by engine speed,
but I would imagine that corrections could be made on a properly
functioning FADEC that would provide usable airspeed and altitude
information.

If I remember correctly it was FADEC non-volitile memory that was
used to estimate the speed during the Air Lauda 767 accident.

D. Swisher