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Problem
Mixture control not
working
Engine will not turn
static rpm or will not
develop rated rpm
12-30
Page 78
Table 1 (Cont.)
Fault Isolation Guide
Cause
Faulty power switches
Faulty wiring in the
harness
Ignition Switch faulty
Tachometer reading is
incorrect
Decreased air flow in the
air induction system
Propeller is out of
adjustment (not reaching
specified low pitch)
Muffler's internal baffles
are broken and blocking
the exhaust outlet
NOTICE: Broken
baffles can move around
freely in the muffler. The
engine may turn static
rpm's intermittently.
Air filter dirty
Too much air dropped
through a new air filter.
Defective air filter
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
Corrective Action
Replace the switches.
Replace the harness.
Check for faults on the ignition
switch circuits. Repair as
necessary.
1. Make sure that the tachometer
operates correctly.
2. Replace the tachometer.
1. Examine the system and
remove all blockages.
2. Make sure that the airbox is
installed in accordance with
the airframe manufacturer's
specifications.
Adjust in accordance with
propeller or airframe
manufacturer's instructions.
1. Hit the muffler with a rubber
mallet or soft object.
2. Listen for a rattle which is
indication of loose baffles.
3. Remove the muffler and
complete the thorough
inspection.
4. Replace muffler as necessary,
in accordance with airframe
manufacturer's instructions.
Replace air filter in accordance
with airframe manufacturer's
instructions.
1. Put the engine on test stand, in
a dust-free area.
2. Remove the air filter.
3. Operate the engine to full
throttle.
4. If the engine operates at full
rpm, replace the air filter with
a new air filter.
© 2021 Avco Corporation. All Rights Reserved
Ref.
OHM
February 2021
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