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T-45C TS & ADV BIFP-09
Instrument Failures
PITOT STATIC MALFUNCTIONS 1.8.1.7.3.2
If the entire pitot static system fails, you will lose all airspeed, all barometric altitude, and
all vertical velocity indicators in both cockpits. Verify the failure of any pitot static
instrument by cross-checking indications between standby and MFD readouts, and with
the other cockpit. A failure may result in frozen readouts, or zero readouts.
You can compensate for a total loss of the airspeed indications by flying the equivalent
angle of attack for climb, cruise, descent, and landing. See the Performance Data
section of NATOPS.
You have two ways to make up for the loss of barometric altitude information. First, you
can use the radar altimeter for height above ground up to 5,000 ft AGL. Second, you
can use the cabin pressure altimeter for altitude information. (Note: Regulations
prohibit flight above 25,000 ft MSL if the cockpit has been depressurized). The cabin
pressure altimeter does not compensate for local barometric pressure and should only
be considered accurate to +/- 500 ft.
To compensate for a total loss of vertical velocity information, use the clock to time 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.
The procedure for dealing with a total pitot static system failure is:
1. Check PITOT HEAT -- ON.
2. Compare instruments in both cockpits. Use AOA, radar altimeter, and/or cabin
pressure altimeter to calculate the approximate airspeed and altitude.
3. Report the failure to ATC.
4. Maneuver to exit icing conditions (if applicable).
5. Remain VMC, if possible.
6. Join with wingman if possible.
7. Consider declaring an in-flight emergency.
STANDBY AIRSPEED INDICATOR FAILURE 1.8.1.7.2.2
A standby airspeed indicator failure––by itself––is not a problem, providing airspeed
information on the display system is still available and correct. If, however, both
indication systems fail (or are in error), you may have to fly AOA in lieu of indicated
airspeed for basic aircraft control. An extensive list of equivalent AOAs for the T-45C
are listed in the Emergency Procedures section of NATOPS (main manual and pilot's
pocket checklist). Some examples follow:
(8-99) Original
Page 9-12


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