Pilot's Operating Handbook
Section 7
Description
Edition 1 - January 15, 2018
Rev. 0
Page 7.7.4
Automatic tank selector - see figures 7.7.2 and 7.7.3
Aut
omatic tank selection allows, without pilot's intervention, feeding the engine from
one tank or the other in predetermined sequences. These sequences depend on
airplane configuration (ground, in-flight, fuel low level CAS messages appearance).
Automatic tank selection system comprises an electronic sequencer, an actuator
attached on the fuel unit, FUEL SEL two-position selector (AUTO, MAN) and SHIFT
push-knob located on FUEL panel.
To operate the automatic selector, set FUEL SEL switch to AUTO position and
manual selector to R or L.
Selector operation
When the system is operated,
AUTO SEL disappears ; the sequencer chooses a
tank (R or L) and through the actuator, positions the fuel unit selector on the selected
tank. The sequencer controls the time during which the selected tank will operate.
This time varies, depending on airplane conditions.
Airplane on ground : tank is changed every minute and 15 seconds.
Airplane in flight : tank is changed every five minutes, as long as FUEL LOW L or
FUEL LOW R does not appear. When the first low level lights on, the sequencer
immediately selects the other tank. The selected tank willoperate untilthe second low
level lights on. When FUEL LOW L-R is visible, the sequencer changes tanks
every minute and 15 seconds.
● NOTE ●
The manual selector is driven by the fuel unit and is positioned on R or L mark
corresponding to the tank selected by the sequencer. Therefore, the pilot
continuously knows the tank which is operating.
●
Test for system proper operation
SHIFT push-button allows the pilot to test system proper operation anytime.
When the system operates, the fuel tank is changed when SHIFT push-button is
pressed once.
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