Skyguide traffic controller killed

Yes, most of the avionics systems on airliners have at least one
backup if they serve a critical function. Some have more.

Autoland is a triple redundant system and all three boxes have to
agree in order to autoland the airplane. Nav/Com radios are also
triple redundant on the 777. The Air Data Intertial Reference Unit on
the 777 (ADIRU) is fault-tolerant, and it is backup up by the SAARU.
TCAS is also redundant on the 777. Faults are detectable by BITE
software.

Dean

"Tom Sixkiller" wrote in message ...
"Dean Wilkinson" wrote in message
m...
Well, first of all this was a center controller, not a tower
controller. I don't believe that center controllers work alone in the
U.S., if they do I would be surprised. Secondly, their phone system
was offline and their conflict warning system was down... what, no
money for backup systems? Would that happen in the U.S.? I sure hope
not...

Do the airlines have redundant (backup) systems?

(Dean Wilkinson) wrote

Autoland is a triple redundant system and all three boxes have to
agree in order to autoland the airplane.

It might have been more correct to state that Autoland from a Cat III
approach is a triple redundant system. I have flown many Autolands
from Cat II approaches in B-727s with only one Sperry autopilot, either
the SP-50 or the SP-150.
It is true that this one autoland approved autopilot was equipped with
an additional "roll monitor" card that became active whenever the
autoland function was engaged and the aircraft was below 500'AGL and it
had two elevator channels, one controlling the left elevator and the
other controlling the right elevator.
But, there was still just one autopilot with just one power source and
receiving ILS signals from one LOC/GS receiver.

Bob Moore

Just curious guys &(or) gals,

How many airliners are equipped with Category III Autoland?
Percent wise.
Also how many airports are equipped to oblige them?

Marty

"Robert Moore" wrote in message
. 7...
(Dean Wilkinson) wrote

Autoland is a triple redundant system and all three boxes have to
agree in order to autoland the airplane.

It might have been more correct to state that Autoland from a Cat III
approach is a triple redundant system. I have flown many Autolands
from Cat II approaches in B-727s with only one Sperry autopilot, either
the SP-50 or the SP-150.
It is true that this one autoland approved autopilot was equipped with
an additional "roll monitor" card that became active whenever the
autoland function was engaged and the aircraft was below 500'AGL and it
had two elevator channels, one controlling the left elevator and the
other controlling the right elevator.
But, there was still just one autopilot with just one power source and
receiving ILS signals from one LOC/GS receiver.

Bob Moore