CHAPTER 20
PAGE 10
MAINTENANCE MANUAL EXTRA 300/SC
PAGE DATE: 1. August 2014
20-10-07 Flexible Hose
For the fuel system aft of the firewall the EXTRA 300SC is
equipped with PTFE-hoses.
For the brake system generally PA hoses (high tensile syn-
thetic fibre hoses) are used, which are also installed as sense
lines for engine instruments. The connection types of those
hoses are outlined in Figure 2.
In the engine compartment PTFE hoses with integrated fire
sleeves are used as fuel, lubrication oil, smoke oil and
sensing lines.
Replacement of Flexible Hose
External forces can significantly reduce hose life or cause
failure. Mechanical loads, which must be considered include
those caused by:
• excessive flexing, twisting, kinking
• tensile or side loads
• too small bend radius and
• vibration.
Any hose that has been kinked or bent to a radius smaller than
the minimum bend radius, and any hose that has been cut or
is cracked or is otherwise damaged should be removed and
discarded.The entire hose assembly must be replaced, if
damage or failure occurs within a flexible hose assembly.
Visual Inspection Hose/Fitting
Any of the following conditions require replacement of
the hose assembly:
• Fitting slippage on hose,
• Cracked or damaged fittings;
• Leaks at fitting or in hose;
• Hard, stiff, heat cracked, or charred hose;
• Kinked, crushed, flattened or twisted hose;
STANDARD PRACTICES AIRFRAME
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