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CHAPTER 2: Instructor / Operator’s Station (IOS)
from now we could just RE SET the Ref. Fail ure Time. As
the Ref. Failure Time counts up from zero as we fl y, the
At ti tude In di ca tor will be gin its grad u al failure at some time
be tween sev en and fi f teen min utes.
IMMEDIATE FAILURE
To invoke an im me di ate failure, enter the SAME val ues
(minutes) in each window that cor re spond to the current
Ref. (reference) Failure Time dis played at the lower-left.
If for example the Ref. Failure Time dis played is 07 (7
min utes), enter 07 in BOTH “Be tween” windows next to
the desired ARMed fail ure. An easier way to invoke an
immediate failure is to leave both “Be tween” values at
00 and simply RESET the Ref. Failure Time by pressing
the RE SET button next to the Ref. Failure Time display
window. Keep in mind though that all failure time window
in ter vals use the Ref. Fail ure Time and as such will be
affected.
SPECIFIC TIME FAILURE
To invoke a fail ure at a specifi c (future) time, en ter the
SAME values (min utes) in BOTH “Be tween” win dows.
If we had been fl ying for fi f teen min utes and wanted the
Pitot Tube to freeze over with an accumulation of ice
three minutes from now, we would simply enter 18 and
18 re spec tive ly in the “Between” column. When the Ref.
Failure Time reached 18 minutes, the Pi tot Tube would
freeze over and we would observe a subsequent er ro ne ous
in di ca tion on the Airspeed In di ca tor (a good time to turn
ON Pitot heat).
Note that if a System failure is invoked its as so ci at ed ARM
button will change to FAIL
when that particular System
actually fails. Affected items within the failed system will
be fl agged (turn or ange) for easy iden ti fi ca tion. The ARM
buttons of these items will NOT change to FAIL. If for
ex am ple we FAILed the Static Sys tem, the ARM but ton
under “Static” would change to FAIL at the time of the failure
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