CHAPTER 20
PAGE 13
PAGE DATE: 12. June 2015
MAINTENANCE MANUAL EXTRA 300LT
20-10-08 Fittings
For the oil lubrication and the fuel system only AN-fittings
are used in the EXTRA 300LT. Generally these fittings are
made of aluminium alloy and are colored blue for identifica-
tion purposes. For firewall penetration special fittings made
of stainless steel are used. The dash number following the
AN number indicates the size of the hose for which the
fitting is made, in 16ths of an inch. This size measures the
inner diameter (I.D.) of hose. The material code letter
(Aluminum alloy: code D) follows the dash number.
Example: Elbow AN 822-8D
N O T E Apply Loctite 577 on all National Pipe Threads (NPT)
before installation.
20-10-09 Control Cables
Control cables are used for the following systems of the
300LT:
• Engine (Throttle, Mixture and RPM)
• Trim
• Heating
Consider the following information when working on engine
control cables. Refer to figure 2:
Hard and abrupt power control inputs may impose high
dynamic peak loads to the related sliding parts at reaching the
travel stops of the engine fuel injector servo. Repeating peak
loads may result in unacceptable additional wear and free
play at the pivot points. Once the free play of the pivot point
would increase, the swivel angle of the sleeve might increase
beyond limits. An increased swivel angle in combination
with an unacceptable high friction of sliding parts may result
in a kink occurring at the pivot point and the end of the swivel
sleeve while pushing the control lever forward from idle to
full throttle position. Finally the solid wire might be forced
to bend at the pivot point and at its terminal connection,
which would result in a failure because it is not designed to
withstand a significant bending load.
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