Extra 300LT, Maintenance Manual

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CHAPTER 20
PAGE 10 PAGE DATE: 21. March 2014
MAINTENANCE MANUAL EXTRA 300LT
20-10-07 Flexible Hose
For the oil and fuel systems aft of the firewall the EXTRA
300LT is equipped with PTFE-hoses. For the brake system
generally PA/high tensile synthetic fibre hoses are used,
which are also installed as sense lines for engine instru-
ments.
In the engine compartment PTFE hoses with integrated fire
sleeves are used as fuel, 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
excessive flexing, twist, kinking, tensile or side loads, 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,
• Damaged, cracked, cut or abraded cover (any reinforcement
exposed);
• Hard, stiff, heat cracked, or charred hose;
• Cracked or damaged fittings;
• Leaks at fitting or in hose;
• Kinked, crushed, flattened or twisted hose; and
• Blistered, soft, degraded, or loose cover.