IO-390-D Series Engine Maintenance Manual
73-10
© 2020 Avco Corporation. All Rights Reserved
Page 260
March 2020
IO-390-D Series Engine Maintenance Manual
Fuel System Inspection Checklist (Cont.)
Inspection Item
Fuel Line or
Injection Nozzle
Findings
Corrective Action
Taken
Examine each fuel line for damage,
leaks, nicks, crimps, kinks, sharp
bends, stains (from fuel leaks), cracks,
brittleness, chafing, and looseness.
Replace (do not try to repair) a worn,
damaged, leaky, chafed, brittle,
crimped, kinked, bent, or loose fuel
line.
Make sure no fuel lines touch the
engine or aircraft baffle hardware.
There must be a minimum clearance
of 3/16 in. (4.76 mm) between a fuel
line and any engine or aircraft surface.
In general, make sure fuel lines do not
touch heat sources.
1
2
3
4
Make sure the mixture control and
throttle linkage have full travel,
freedom of movement.
Correct the mixture control and
throttle linkage limited travel or
restricted movement per the aircraft
manufacturer’s instructions.
N/A
Lubricate the linkage per the aircraft
manufacturer's instruction.
N/A
Make sure each fuel line is held in
place securely using clamps with
cushions to prevent fuel line
movement due to vibration.
If a fuel
line had been in service and clamps
were not installed, replace the fuel
line with a new fuel line.
Make sure clamps are securely
attached. If the clamps are loose,
replace the fuel line. Install new
clamps that attach the line securely.
On engines that use metal clamps with
no cushion, install a fuel line sleeve at
each of those clamping locations.
1
2
3
4
