Maintenance and Inspection Procedures Manual
Type:
CT
Series:
CTLS
LSA
Page: 6-1
AF 04800001
Revision No. 3
Date: 14 Sep 2008
6 Fuel
System
6.1 General
Fuel system inspection and maintenance are to be performed in a well-ventilated compartment, away
from heaters and flame.
A fuel tank with a capacity of 65 l is integrated into each wing. The fuel tanks are each divided into two
sections by an anti-sloshing rib. Fuel is filled into the outer section via a fuel filler opening on the upper
side of each wing. To open the fuel filler cap, the lever in the cap must be raised and turned 90° anti-
clockwise. The cap can then be removed. The cap is properly shut when the lever is pressed down into
position.
Fuel flows via a return flow flap into the section inside the anti-sloshing rib. The return flow flap does not
hermetically seal the chamber. It does, however, greatly constrain the return flow of fuel into the outer
chamber when one wing is low (sideslip). A sideslip can thus be undertaken even when low on fuel
without risking fuel starvation to the engine.
The tanks are vented via coupled tubes in the outer tank sections, the air coming from NACA inlets on the
outer side of each of the upper winglets. The vent tube is led through the outer tank section in a loop. In
this way, no fuel can escape into the vent tubes should the aircraft be parked at a slant. As the tubes are
coupled, equal pressure prevails in both tanks even when the winglets experience different flow
conditions.
Each tank outlet has a coarse screen which can be removed via a maintenance flap in the root rib for
visual inspection and cleaning.
Fuel is fed by gravity via two down lines in the A columns. They have lager volume to maintain fuel flow
also in sideslip conditions with low fuel for a certain time.The two lines are connected to each other via a
T-piece. The fuel shutoff valve is located behind the fine fuel filter and directly before the lead-through
through the fire wall. The fuel flow sensor and the associated pulsation damper are in this lead-through,
the latter being in the engine compartment.
The fuel flows from here into the gascolator which has another fine filter. The gascolator is the lowest
point in the fuel system and has a drain valve. The fuel system must be drained at this point before the
first flight of the day and after filling up with fuel.
The fuel pump feeds fuel from the gascolator to the engine which then feeds the fuel to the carburetors.
Excess fuel is pumped back to the gascolator.
The fuel system is presented schematically in the following diagram.