Airplane Maintenance Manual
Bristell
B23-915
Chapter 28
supplement
Chapter 28 Page 6
Issue: 09.12.2021
28-20
Distribution
Fuel flows from the tanks through the pick-up line (4, Figure 4) and
fuel lines to the dual fuel selector valve (3), actuated by the fuel selector
handle (1) over the handle extension (2). From the fuel selector valve
the fuel is filtered in the coarse fuel filter (5) and led to the fuel pump
assy (main and aux; 6) located in the fuel pumps bay. From there it
passes the fine fuel filter (9) with an alternative way through the bypass
(8) in case of clogged fine fuel filter. Upstream from the fine filter the
fuel pressure is measured (7). After the fine filter the fuel is fed (10)
into the fuel rail and from there distributed to the fuel injection pumps.
The excess fuel is returned through the return line (11) into the chosen
tank (left/right; 13). A bypass routing (12) feeds the return flow into
the RHS tank to prevent overpressure in the return part of the fuel
system with closed fuel selector valve. The fuel selector valve (3) works
also for interruption of fuel supply in case of engine fire or for airplane
long
–
time parking. The fuel selector is located on the middle console
between the seats in the cockpit.
Figure 4
Distribution
Item
Description
Item Description
1
Fuel selector handle
2
Fuel selector handle extension
3
Dual fuel selector valve
4
Fuel pick-up lines from tank
5
Fuel coarse filter
6
Fuel pumps (main and aux)
