FLIGHT
INSTRUMENTS
AIRPLANE
OPERATIONS
MANUAL
2-17-20
Page
10
Code
01
REVISION 39
AOM-145/1114
ATTITUDE
Using the data from the respective sensors after its conversion to
digital format, the system computes and displays attitude.
The CAGE button resets attitude to provide a fast erection function.
The CAGE function is not operational during the initialization mode
and must only be used in stabilized flight conditions.
If a failure of the attitude function is detected by internal monitoring,
attitude display information, e.g. brown and blue background, pitch
scale, roll scale and roll pointer is removed and replaced by black
background, and an ATT flag is displayed.
ALTITUDE
Altitude data is provided by processing static pressure sensed by
Pitot/Static tube 3.
Altitude is displayed in tape format. Pushing the STD button sets the
ISIS reference barometric pressure to standard (QNE). The barometric
pressure can be adjusted, starting from the standard value, by using
the rotary BARO knob.
In case a failure of the altitude function is detected by the internal
monitoring system, the altitude tape is removed and an ALT flag is
displayed.
INDICATED AIRSPEED
Airspeed data is provided by processing dynamic pressure sensed by
Pitot/Static tube 3.
Airspeed is presented in tape format. In case a failure is detected by
the internal monitoring system, the airspeed tape and pointer are
removed and a SPD flag is displayed.
SECONDARY PARAMETERS
In addition to primary parameters, the system computes and displays
the following secondary parameters:
− Magnetic heading.
− Mach number.
− VMO.
− Lateral acceleration/Slip indication.
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