CHAPTER 20
PAGE 13
MAINTENANCE MANUAL EXTRA 300/SC
PAGE DATE: 1. August 2014
20-10-08 Fittings
For the oil lubrication and the fuel system only AN-fittings
are used in the EXTRA 300/SC. 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 the 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
EXTRA 300/SC:
• Engine (Throttle, Mixture and RPM control)
• Trim
• Heating (optional)
Consider the following information when working on engine
control cables, refer to Figure 3:
Hard and abrupt power control inputs may impose high
dynamic peak loads to the related sliding parts when 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 combi-
nation 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 connec-
tion, which would result in a failure because it is not designed
to withstand a significant bending load.
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