Cirrus Design Section 3
SR22T Emergency Procedures
P/N 13772-003 3-25
Overboost / Pressure Relief Valve
1. Power Lever .................................... REDUCE to 30.5 in.Hg or less
2. Mixture ..................................ADJUST fuel flow to top of green arc
If continued surging is present:
3. Land as soon as practical
Amplification
Although it is an unlikely failure mode, the wastegate may be stuck in a
closed position. If pressure relief valve is obviously surging (cycling
high manifold pressure followed by sudden drop to lesser pressure,
may be accompanied by "pop" noise), it may be evidence of MAP
controller setting problem but may also be evidence of a seized
wastegate. Engine will be adequately protected by the pressure relief
valve, but turbo overspeed may result in turbo failure if pressure relief
valve remains OPEN. Reducing manifold pressure (via power lever)
will decrease the airflow through the engine, thereby reducing the
energy available to drive the turbine; enriching the mixture will
maintain lower turbine temperatures. It is unnecessary to descend
prematurely, lower altitudes (higher density air) may aggravate the
condition.
Turbine Inlet Temperature High
TIT Warning
1. Mixture ............................. ADJUST Fuel Flow to Top of Green Arc
2. Ignition Switch.....................................................CHECK on BOTH
If TIT remains in excess of limits:
a. Power ........................................................................REDUCE
b. Land as soon as practical.
Amplification
Annunciation indicates that one or both turbochargers are exceeding
turbine inlet temperature limits, condition can be reduced and
controlled by mixture management but may be a sign of improper
combustion or magneto failure.
TIT
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