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T-45C TS & ADV BIFP-09
Instrument Failures
Takeoff
20 units (full flaps)
Climb
10-11 units
Maximum range
12-13 units
Approach
17 units
The procedure for dealing with a combined standby airspeed indicator failure, plus a
display system airspeed failure is:
1.
Check PITOT HEAT -- ON.
2.
Report the failure to ATC.
3.
Fly AOA in place of airspeed.
4.
Be aware that display system navigation information that uses airspeed may be
missing or incorrect.
5. Watch for other indications of pitot static system problems.
6. Land as soon as practicable.
STANDBY BAROMETRIC ALTIMETER FAILURE 1.8.1.7.9.2
You have two options to make up for the loss of the standby barometric altimeter. The
system may or may not show proper altitude on display system altitude readouts.
First, you can use the radar altimeter for height above ground for altitudes up to 5,000 ft
AGL. You must add ground elevation to radar altitude to approximate mean sea level
(MSL) altitudes.
Second, you can obtain backup altitude information from the cabin pressure altimeter.
This instrument should be considered accurate to +/-500 ft and is primarily useful at
altitudes above 5,000 ft AGL, peak altitude for the radar altimeter. In order to use the
cabin pressure altimeter above 5,000 ft MSL, you will have to depressurize the cockpit,
and depressurized flight above 25,000 ft is prohibited.
Don’t forget to cross-check your other pitot static system instruments (airspeed and
vertical velocity indicator) to determine if they are operating correctly. The vertical
velocity indication on the ADI display is generated by the GINA and is not affected by a
pitot static system malfunction.
The procedure for dealing with a standby barometric altimeter failure that also includes
display system barometric altitude readout failure is:
1. Check PITOT HEAT -- ON.
2. Report altimeter failure to ATC.
3. Use the radar and the cabin pressure altimeters to determine altitude (depressurize
cockpit if required).
(8-99) Original
Page 9-13


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