HEADING REVERSION SWITCH (HDG REV)
The heading reversion switch is an auxiliary push button switch (HDG REV) on the respective pilot's
and copilot’s instrument panels which allows selection of the opposite side attitude and heading
reference system (AHRS) as an alternate (reversion) heading source for the pilot's or copilot’s flight
director. MAG 2 (MAG 1) or DG 2 (DG 1) will be annunciated in amber in the center-left of the PFD.
The annunciation of MAG or DG will be controlled by the position of the respective AHRS DG/
SLAVE/TEST switch on the pilot’s or copilot’s instrument panel. If there is no reversion selection and
both systems are selected to their own respective sources, there will be no annunciation. If there is a
cross-selection (reversion) on both sides, the annunciation will be in white. If the same AHRS is
selected as a heading source on both sides, the heading source annunciation will be in amber, to
apprise the pilots that both indicators are selected to the same heading source.
ATTITUDE REVERSION SWITCH (ATT REV)
The attitude reversion switch (ATT REV) is an auxiliary push button switch on the respective pilot's
and copilot’s instrument panels which allows selection of the opposite side attitude and heading
reference system (AHRS) as an alternate (reversion) attitude source for the pilot's or copilot’s
attitude direction indicator (ADI) in their respective PFD. ATT 2 or ATT 1 will be annunciated in amber
in the upper left of the PFD. If the same AHRS is selected as an attitude source for the attitude
indicators on both sides, the attitude source annunciation will be in amber; if both systems are
selected to their respective sources there will be no annunciation. In case of a reversion selection,
the annunciation is in amber to apprise the pilots that both indicators are selected to the same
attitude source.
RADOME COOLING FAN
An avionics cooling fan is mounted well forward in the right side of the nose compartment to provide
circulation of cooling air to the radar set and other nose mounted avionics while on the ground. An
amber RADOME FAN annunciator on the annunciator panel monitors the condition of the cooling
fan. If the RADOME FAN annunciator illuminates, indicating failure of the fan, procedures in
Abnormal Procedures of the AFM should be followed. In flight, no abnormal conditions should be
experienced, however, ground operation is time limited.
EFIS BACKUP MODES
In case of a symbol generator (SG) failure, the side having the failure may be selected to the
opposite side SG by means of the SG REV selector (SG 1/NORM/SG 2) on the RI-552 controller. If
SG1 is selected it means that the symbol generator in the pilot’s IC-615 is driving both PFDs. SG2
means the symbol generator in the copilot’s IC-615 is driving both PFD displays. In these cases both
PFD displays will have the same format. The annunciation (SG 1 or SG 2) will be amber.
Cessna Citation XLS - Instrumentation & Avionics
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