AIRPLANE
OPERATIONS
MANUAL
FLIGHT
INSTRUMENTS
REVISION 39
2-17-20
Page
9
Code
01
AOM-145/1114
INTEGRATED STANDBY INSTRUMENT SYSTEM (ISIS
THALES)
The ISIS provides the following parameters:
− Attitude (pitch and roll);
− Standard or barometric-corrected altitude and associated
barometric pressure;
− Indicated airspeed;
− Indicated Mach number;
− VMO (Maximum Operating Speed);
− Skid/Slip information;
− Magnetic heading (from AHRS 1or IRS 1).
For all EMB-145 models except EMB-145 XR model the ISIS relies on
28 V DC power, provided by the Essential DC Bus 2. In case of an
electrical emergency, it will operate solely on the airplane batteries for
approximately 40 minutes.
For the EMB-145 XR model, the ISIS relies on 28 V DC power, provided
by the Backup Hot Bus. In case of an electrical emergency, it will
operate solely on the airplane batteries for approximately 240 minutes.
For the EMB-145 XR model, the ISIS will be de-energized when the
battery knobs are positioned to OFF while the airplane is powered by
the GPU or generators.
The system is powered as soon as the airplane batteries are switched
to AUTO. Then, the ISIS starts its alignment phase, which takes about
90 seconds to be completed and can be identified on the screen by
the “INIT 90 s” flag.
NOTE: The airplane must not be moved during the first 90 seconds
after power-up, while the ISIS is undergoing alignment. Moving
the airplane during this period can cause in-flight attitude
indication errors, that are not noticeable on ground. For ISIS
Post-Mod. SB 145-34-0049 and on, the “ATT” flag is displayed
in this case.
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