Fuel Pump (If Used); Mixture; Fuel Selector; Ignition Switch - Cirrus DESIGN SR20 Information Manual

Section 3
Emergency Procedures
The following procedure provides guidance to isolate and correct
some of the conditions contributing to a rough running engine or a
partial power loss:
1. Fuel Pump.......................................................................... BOOST
Selecting BOOST on may clear the problem if vapor in the
injection lines is the problem or if the engine-driven fuel pump has
partially failed. The electric fuel pump will not provide sufficient
fuel pressure to supply the engine if the engine-driven fuel pump
completely fails.
2. Fuel Selector ........................................................ SWITCH TANKS
Selecting the opposite fuel tank may resolve the problem if fuel
starvation or contamination in one tank was the problem.
3. Mixture ............................. CHECK appropriate for flight conditions
4. Power Lever ....................................................................... SWEEP
Sweep the Power Lever through range as required to obtain
smooth operation and required power.
5. Alternate Induction Air............................................................... ON
A gradual loss of manifold pressure and eventual engine
roughness may result from the formation of intake ice. Opening
the alternate engine air will provide air for engine operation if the
normal source is blocked or the air filter is iced over.
6. Ignition Switch ...................................................... BOTH, L, then R
Cycling the ignition switch momentarily from BOTH to L and then
to R may help identify the problem. An obvious power loss in
single ignition operation indicates magneto or spark plug trouble.
Lean the mixture to the recommended cruise setting. If engine
does not smooth out in several minutes, try a richer mixture
setting. Return ignition switch to the BOTH position unless
extreme roughness dictates the use of a single magneto.
7. Land as soon as practical.
3-14
Cirrus Design
P/N 13999-002 Info Manual
September 2011
SR20