
74-30
Page 2 Serials 0002 thru 0434, 0435 thru 0820 w/o PFD
EFFECTIVITY:
CIRRUS AIRPLANE MAINTENANCE MANUAL MODEL SR22
15 Apr 2007
2. MAINTENANCE PRACTICES
A. Ignition Switch - Serials 0002 thru 0434, 0435 thru 0820 w/o PFD (See Figure 74-301)
(1) Removal - Ignition Switch
(a) Turn ignition switch to the OFF position.
(b) Remove engine cowling. (Refer to 71-10)
(c) Disconnect battery. (Refer to 24-30)
(d) Remove LH kick plate. (Refer to 25-10)
(e) Remove retaining nut securing ignition switch to bolster panel, remove placard plate, and
remove switch from panel.
WARNING: Prior to disconnecting ignition switch, ground P-leads at magnetos to
prevent accidental firing of engine.
CAUTION: When removing wire leads from ignition switch, note EXACT location of
attaching leads for reference on reinstallation.
(f) Loosen screws from terminals on back of ignition switch and remove wire leads.
(2) Installation - Ignition Switch
(a) Connect wire leads to ignition switch.
(b) Perform Functional Check - Ignition Switch. (Refer to 74-30)
(c) Position ignition switch in bolster panel, position placard on ignition switch, and install
retaining nut.
(d) Install LH kick plate. (Refer to 25-10)
(e) Connect battery. (Refer to 24-30)
(f) Install engine cowling. (Refer to 71-10)
(3) Functional Check - Ignition Switch
(a) Acquire necessary tools, equipment, and supplies.
(b) Remove engine cowling. (Refer to 71-10)
(c) Disconnect battery. (Refer to 24-30)
(d) Check right P-lead continuity:
1Remove P-lead from right magneto.
2Attach P-lead to ohmmeter and to airframe ground.
3With switch in OFF or L position, verify ohmmeter indicates closed circuit.
4With ignition switch in R or BOTH position, verify ohmmeter indicates open circuit.
5Connect P-lead to right magneto.
(e) Check left P-lead continuity:
1Remove P-lead from left magneto.
2Attach P-lead to ohmmeter and to airframe ground.
3With switch in OFF or R position, verify ohmmeter indicates closed circuit.
4With ignition switch in L or BOTH position, verify ohmmeter indicates open circuit.
5Connect P-lead to left magneto.
(f) Connect battery. (Refer to 24-30)
(g) Install engine cowling. (Refer to 71-10)
Description P/N or Spec. Supplier Purpose
Ohmmeter - Any Source Test continuity.