3-28 P/N 23020-002
Cirrus SR20 and SR22 Flight Operations Manual
Section 3 Standard Operating Procedures
15. Alternator ........................................................................... CHECK
Alternator will be checked by placing greater electrical loads and
turning on additional equipment below.
a. Pitot Heat............................................................................ ON
b. Navigation Lights ................................................................ ON
c. Landing Light ...................................................................... ON
d. Annunciator Lights ...................................................Verify OFF
Verify both ALT 1 and ALT 2 caution lights located on the PFD are
extinguished and positive amps are indicated.
16. Voltage ............................................................................... CHECK
Verify positive voltage outputs for both Main buses and the
Essential Bus.
17. Pitot Heat .................................................................................. ON
Pitot heat should be turned ON prior to all flights to reduce the
possibility of pitot tube icing.
18. Navigation Lights.................................................... AS REQUIRED
Select navigation lights ON for night operations.
19. Landing Light ......................................................... AS REQUIRED
Select landing light ON. It is recommended to leave the landing
light on while within 10NM of the departure airport.
20. Magnetos .............................................. CHECK LEFT and RIGHT
a. Ignition Switch ................................. R, note RPM, then BOTH
b. Ignition Switch .................................. L, note RPM, then BOTH
RPM drop must not exceed 150 RPM for either magneto. RPM
differential must not exceed 75 RPM between magnetos. If there is
a doubt concerning operation of the ignition system, RPM checks
at higher engine speeds will usually confirm whether a deficiency
exists. An absence of RPM drop may indicate faulty grounding of
one side of the ignition system or magneto timing set in advance
of the specified setting.
21. Engine Parameter .............................................................. CHECK
June 2008
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