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T-45C TS & ADV BIFP-09
Instrument Failures
4. Be aware that the IFF altitude encoding signals may also be in error.
5. Land as soon as practicable.
STANDBY VSI FAILURE 1.8.1.7.8.2
If you lose all vertical velocity information (standby and display systems), use the clock
to gauge the amount of altitude change occurring over a specific period of time. For
example, if you descend 200 ft in 15 seconds, your rate of descent is 800 ft per minute.
You can also use this procedure to check the accuracy of a suspect VSI.
It is important that you determine whether other instruments in the pitot static system
are operating correctly. What may appear to be a stuck or erroneously indicating VSI
could be part of a larger pitot static system problem.
NOTE: With a failed VSI and display system vertical velocity readout, your PAR
approach capability is severely limited.
The procedure for dealing with a total VSI/vertical velocity readout failure is:
1.
Check that PITOT HEAT -- ON.
2.
Cross-check the altimeter and clock for a vertical velocity reference.
3.
Check functionality of HUD velocity vector and use as appropriate aid.
4.
Watch for other indications of possible pitot static problems.
PROGRESS CHECK
Question 5 — 1.8.1.7.3.2
Which of the following instruments may be affected by a pitot static
malfunction?
a)
Airspeed indicator
b)
Barometric altimeter
c)
Vertical velocity
d)
Standby vertical speed indicator
e)
Angle of attack indicator
ANSWER:
Page 9-14
(8-99) Original


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