"C Knowles" wrote in message
news
Not that familiar with the 757 but GPS displays GS. Add or subtract winds
to
get TAS, then correct for density (divide by SMOE) to get IAS?CAS. Heard
it
suggested you could also depressurize and use the cabin altimeter for
altitude. Or, convert cabin altitude into aircraft altitude if the chart
is
available.
Curt

Multiple redundant systems on Commercial jets. Figure out which one is bad
and turn it off. The standby #3 system is analog and totally separate if
it's like a 747-400. The captain should have given control to the copilot
in the turkish aircraft incident.




"Emilio" wrote in message
...
A portion of thread from different news grope:

loss of a 757 a few years ago in which clogged pitot tubes
caused bad overspeed warnings; the Turkish crew pulled
back the power and stalled and crashed. It was later determined
that the A/C had sat for a month and insects had gotten into
uncovered pitot tubes.

With aircraft equipped with GPS that shows your true speed, can you fly
by
it when pitot tube is down?

Emilio.