24-30
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EFFECTIVITY:
CIRRUS AIRPLANE MAINTENANCE MANUAL MODELS SR22 AND SR22T
15 Jun 2010
E. Master Control Unit (See Figure 24-305)
MCU part number 14600-001, 14600-002, 16600-001, 19900-001, and 19800-001 are field repairable
to the extent provided for in Chapter 24-00, Electrical Power Troubleshooting. (Refer to 24-00) Field
repair is limited to replacing the following components: current sensors, logic module, fuses, and field
control modules. The MCU part number may be determined from a placard located on the MCU chas-
sis.
Note: Airplane serial effectivities may vary from shown if originally installed MCU has been
replaced.
MCU part number 14600-001 (MCU 100) is installed on SR22 airplanes serial numbers 22-0098 thru
22-0447.
MCU part number 14600-002 (MCU 100) is installed on SR22 airplanes serial numbers 22-0448 thru
22-1469.
MCU part number 16600-001 (MCU 120) is installed on SR22 airplanes serial numbers 22-1470 thru
22-1601, 22-1603 thru 22-1643, 22-1645 thru 22-1662.
MCU part number 19900-001 (MCU 130) is installed on SR22 airplanes serial numbers 22-1602, 22-
1644, 22-1663 thru 22-3026 and subs w/o Perspective Avionics.
MCU part number 19800-001 (MCU 140) is installed on SR22 and SR22T airplanes serial numbers w/
Perspective Avionics.
(1) Removal - Master Control Unit
(a) Set BAT 1, BAT 2, and AVIONICS switches to OFF positions.
(b) Remove engine cowling. (Refer to 71-10)
(c) Disconnect battery 1. (Refer to 24-30)
(d) Remove nuts and washers securing grounding strap to MCU chassis.
(e) MCU 14600-001, 14600-002, & 16600-001: Disconnect P108, P109, P111, and P115 con-
nectors.
(f) MCU 16600-001: Disconnect P757 connector, if installed.
(g) MCU 19900-001: Disconnect P135, P136, P137, and P138 connectors.
(h) MCU 19800-001: Disconnect P180, P181, P182, and P183 connectors.
(i) MCU 19900-001: Remove nuts, washers, and clamps securing wire loom to chassis.
(j) MCU 19900-001: Remove nuts and washers securing landing light ballast to chassis.
(k) MCU 14600-001, 14600-002 & 16600-001: Remove MCU cover. (Refer to 24-30)
Note: MCU 14600-001 & 14600-002: Label cable guide routing holes with cable
component name to facilitate re-installation.
(l) MCU 14600-001 & 14600-002: Remove screws and washers securing cable guide to
MCU chassis.
(m) Remove nuts and washers securing starter cable assembly to bus bar stud.
(n) Remove nuts and washers securing alternator 1 cable assembly to bus bar stud.
(o) Remove nuts and washers securing battery 1 cable assembly to bus bar stud.
(p) Remove nuts and washers securing alternator 2 cable assembly to bus bar stud.
(q) Remove bolts and washers securing MCU to firewall. Remove MCU from airplane.
(2) Installation - Master Control Unit
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