Document: SLSA-MIP-5-4-0-US
Date of Issue: 05/2016
Revision: -
9-7
9.4
Check / Adjustment
9.4.1
Checking fuel system tightness
NOTE
Tightness is checked by pressurized air or fuel. When performing a specific tightness check,
outside temperature fluctuations must not be bigger than ±13°C (8°F). Reseal found out
leakage by a suitable method
– by tightening, by using a suitable sealing.
9.4.1.1
Checking airplane fuel system tightness by air
Connect an appropriate device to the filing neck for pressurizing.
Blind the fuel filter by plugs. Blind the fuel tank venting with the rubber plug (or from a
similar material) and secure it with locking wire.
ANDAIR selector valve
–
ON
position
– choose the tank.
Supply air pressure of 24 kPa (3.48 psi) to the system by means of the pressurization
equipment.
Shut the air pressure supply. During 15 minutes there must not be any loss in pressure.
Find out leakage by listening to and by soap water.
ANDAIR selector valve
–
OFF
position.
9.4.1.2
Checking airplane fuel system tightness by fuel
Fill up the fuel tanks with fuel.
Connect the pressurization equipment to the filler neck.
Blind the fuel filter and the fuel return line bushing by plugs
– or interconnect it with the
fuel hose. Blind the fuel tank venting by rubber plug (or from another suitable material)
and secure it with locking wire.
ANDAIR selector valve
–
ON
position
– select the tank.
Supply air pressure of 3,48 psi to the system by means of the pressurization.
During 15 minutes there must not be any loss in pressure. There must not be any
leakage. Checked joint is considered hermetic unless any evidence of fuel leakage is
detected on the checked surface during tests.
ANDAIR selector valve
–
OFF
position.
9.4.2
Fuel pump check
9.4.2.1
Check for cracks
Check the fuel pump body for cracks, including the inlet and the outlet hose. If cracks are
detected, immediately exchange the fuel pump with new pump.
9.4.2.2
Checking fuel leakage
Perform engine inspection and check the fuel pump body, including inlet and outlet hose, for
fuel leakage. In case of fuel leakage, find out the reason and if necessary exchange the fuel
pump for the new pump.
Summary of Contents for S-LSA
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