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Page Title: ENGINE COMPRESSOR SURGES (STALLS) (LOUD POPPING NOISE HEARD FROM ENGINE).
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TM 9-2835-255-34
3-2. TROUBLESHOOTING - CONTINUED
d. ENGINE - CONTINUED
(2) ES-18. ENGINE COMPRESSOR SURGES
(STALLS) (LOUD POPPING NOISE
HEARD FROM ENGINE).
This section contains troubleshooting to locate and correct the cause (s)
of engine compressor surge (stall). The compressor section delivers air
at a specific pressure to the combustor section. If this air flow is not
maintained, high pressure air in the combustor section will tend to
discharge back into the compressor and cause compressor air flow to
stop . Once pressures have neutralized, compressor airflow will resume
until the compressor/combustor pressure ratio becomes unbalanced again,
repeating the above cycle. This cyclic action can sound like a loud
popping noise. The engine compressor air bleed valve system, variable
inlet guide vane (IGV) system and variable power turbine stator (PTS)
system function to maintain the balanced air pressure ratio. Foreign
object damage (FOD) to compressor blades or vanes will prevent the
compressor section from providing proper air pressure. A faulty air
bleed valve system will not allow air to be bled from the compressor
properly. A faulty IGV system will prevent the proper flow of air
entering the compressor section. A faulty PTS system will prevent the
proper control of airflow through the engine. The art on the following
pages provides an overview of the systems described above. Refer to
these pages along with in-text art while performing troubleshooting.
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