Cirrus SR20 Maintenance Manual page 35

C I R R U S
A I R P L A N E M A I N T E N A N C E M A N U A L
(4) Operational Inspection - Master Control Unit - Serials w/ Perspective Avionics
In order to perform the following check the engine must be operating. Do not stand or let anyone
else stand close to the arc of the airplane's propeller while conducting this check.
(a) Verify all circuit breakers are set.
(b) Toggle battery 2 master switch to the ON position and verify the following occurs:
1
2
3
4
5
6
7
(c) Toggle battery 1 master switch to the ON position and verify the following occurs:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
(d) Start Engine and set engine speed at 1000 RPM.
(e) Switch ALT 1 ON and ALT 2 ON.
(f) Verify landing light, pitot heat, avionics, strobe lights, and navigation lights are on.
(g) Increase RPM to 1700.
(h) Check that BAT 1, ALT 1, ALT 2, ESS BUS, M BUS 1, and M BUS 2 caution and warning
annunciations are off.
(i) Increase RPM to 2200.
(j) Check that BAT 1, ALT 1, ALT 2, ESS BUS, M BUS 1, and M BUS 2 caution and warning
annunciations are off.
(k) Serials 2016 thru 2064 w/ Vent only: Turn vent airflow off and on. Verify control of airflow
into the cabin.
(l) Switch ALT 1 ON and ALT 2 OFF. Verify and record operating values from MFD.
EFFECTIVITY:
Serials 1268 & subs
Flap position light off.
Serials w/o MD302 Standby Attitude Module: Standby attitude gyro low voltage flag
hidden.
Serials w/ MD302 Standby Attitude Module: MD302 Standby Attitude Module pow-
ers up.
PFD powers up.
MFD is off.
Essential Bus voltage (indicated on PFD) is 22 to 26 volts.
ALT 1 and ALT 2 caution annunciations on PFD.
Flap position light illuminates.
MFD powers up.
Pull PFD #1 circuit breaker and verify PFD remains on.
Reset PFD #1 circuit breaker.
Serials w/o MD302 Standby Attitude Module: Pull STDBY ATTD #1 circuit breaker
and verify standby attitude gyro voltage flag remains hidden.
Serials w/ MD302 Standby Attitude Module: Pull STDBY ATTD #1 circuit breaker
and verify MD302 Standby Attitude Module remains powered up.
Reset STDBY ATTD #1 circuit breaker.
Pull MFD #2 circuit breaker and verify MFD remains on.
Reset MFD #2 circuit breaker.
Switch on Landing Light and verify Landing Light illuminates.
Switch off Landing Light.
Serials w/ Fan or Air Conditioning: Turn on Cabin Fan and verify fan is on.
Serials w/ Fan or Air Conditioning: Turn off Cabin Fan.
ALT 1 and ALT 2 caution annunciations on PFD.
BAT 1 current indicator shows slight discharge.
Bus Volts (V)
ESS M1 M2 ALT 1
M O D E L S R 2 0
Current (A)
ALT 2 BAT 1
24-30
Page 35
19 Sep 2017