Maintenance Manual XA41/XA42
AMM-XA42-0040-001 C.00
Page date:
Page
11
25.09.2018
Chapter 28
WARNING
28-20-04 Auxiliary/Boost Pump
If the engine-operated fuel pump does not operate correctly, an auxiliary/boost pump
supplies sufficient fuel to the engine.
The auxiliary/boost pump also operates as a primer during the start of the engine.
The switch for the auxiliary/boost pump is on the right side panel of the rear cockpit.
The auxiliary/boost pump is in the lower left forward fuselage compartment.
Figure 28-9: Installed auxiliary/boost pump
In case of replacing the auxiliary/boost pump, the new pump needs to be set correctly.
To set a new auxiliary/boost pump:
1
Loosen the counter nut on the setting screw. Refer to Figure 28-9.
2
Screw the setting screw all the way in without applying torque.
3
Loosen the setting screw by 270°.
4
Fix the setting screw in that position by torqueing the counter nut.
To remove the auxiliary/boost pump:
1
Set the fuel selector switch to OFF.
2
Remove the lower left forward fuselage compartment cover.
3
Disconnect the electric cables.
4
Disconnect the fuel lines and the vent line from the auxiliary/boost pump. Drain the
fuel into an applicable container.
5
Remove spilled fuel immediately.
6
Remove the clamp.
7
Remove the auxiliary/boost pump.
Make sure that you install the auxiliary/boost pump in the correct direction. Find the IN and
OUT markings on the pump (refer to Figure 28-9) to connect the auxiliary/boost pump
correctly. An incorrectly installed auxiliary/boost pump can cause accidents.
Counter nut
Setting screw
Summary of Contents for XA41
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