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EXHAUST SYSTEM CRACKSFrom CP59, Page 9 (April, 1989)
Lew Miller, Long-EZ
builder/flyer, reports finding hairline cracks across the flanges and around one exhaust
stack after 250 hours of operation. This was a Brock exhaust system and he had been
smelling a faint exhaust smell while climbing with the cabin vent closed for sometime and
had searched high and low in the engine compartment before he found the almost invisible
cracks. He welded up all cracks and has had no more problems and no more smell but says he
is not confident he won't have this re-occur since he has done nothing to fix the cause.
We have not heard of a Brock exhaust system cracking before but
an exhaust system can, and will, crack if you have excessive vibration. Watch out for this
- any exhaust smell in the cockpit is cause to examine the exhaust system with a bright
light and possibly a magnifying glass. Please report any cracks to RAF so we may report
them in the CP.