DA20-C1 Flight Manual
Supplement 13
Doc # DA202-C1 April 06, 2010 Page S13 - 10
3.3 Abnormal Indications
3.3.1 Heading Failure
A magnetometer failure is indicated by a HDG with a red X over it just to the left of the
heading display. If the GDU620 is still receiving valid GPS ground track from the GNS
navigator, the heading will be replaced with GPS ground track in magenta. The aircraft
can be flown by reference to GPS ground track instead of heading. In this case, the
autopilot will continue to fly in HDG mode, but the course being sent to the autopilot will
be based on ground track instead of magnetic heading.
A complete Heading Failure (magnetometer and GPS ground track failure) is indicated
by the digital heading presentation being replaced with a red X and the compass rose
digits being removed. The course pointer will indicate straight up and operate much like
a traditional CDI with the Omni-Bearing Selector being adjusted by the PFD knob set to
CRS.
Under this condition, the pilot must use an alternate source of heading such as the
standby compass. If the installation includes an autopilot, the pilot workload may be
reduced by operating that system in NAV mode.
3.3.2 AHRS Failure
A failure of the AHRS is indicated by a removal of the sky/ground presentation, a red X,
and a yellow "AHRS FAILURE" shown on the PFD. A heading failure will also occur as
described above in 3.3.1.
1. Set course datum using CRS selection of the PFD knob
2. Seek VFR conditions or land as soon as practical.
3.3.3 Air Data Computer (ADC) Failure
Complete loss of the Air Data Computer is indicated by a red X and yellow text over the
airspeed, altimeter, vertical speed, TAS and OAT displays. Some derived functions,
such as true airspeed and wind calculations, will also be lost.
1. Use Standby Airspeed Indicator and Altimeter
2. Seek VFR conditions or land as soon as practical.
3.4 Loss of Electrical Power
In the event of a total loss of electrical power, the G500 system will cease to operate and
the pilot must utilize the standby instruments to fly the aircraft.
Revision 25 DOT Approved
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