RFMS Garmin G500H as installed in Bell 206A 190-01150-12 Rev. B
FAA APPROVED Page 13 of 24
3.2.3 AHRS Failure
A failure of the Attitude and Heading Reference System (AHRS) is indicated by
a removal of the sky/ground presentation, a red X over the attitude indicator, and
a yellow “AHRS FAILURE” shown on the PFD. A heading failure will also be
indicated.
1. Use visual references for aircraft control
2. Set course datum using CRS selection of the PFD knob
The Attitude, Heading and Reference System (AHRS) requires at least one GPS
or air data input to function properly. In the unlikely event that GPS data and air
data is not received by the AHRS, the system will not provide Attitude, Heading,
Altitude, or Airspeed information; however, if the PFD is receiving valid GPS
information, the reversionary data on the PFD provides GPS Track and GPS
Altitude data along with course information and deviations which are still valid
and may be used to navigate.
3.2.4 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 GDU 620 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.
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
the standby compass.
3.2.5 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 and Altimeter, visual references, and secondary
cues
3.2.6 Navigation
If navigation information on the PFD/MFD (HSI, RMI, WPT bearing and
distance information, or Moving Map Data) is not available or appears invalid,
select an alternate data source (via CDI key or 1-2 key) or utilize the data
directly from the navigation equipment as required.
(20 pages)
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