7-26
P/N 11934-003
Section 7
Cirrus Design
Airplane Description
SR20
Attitude Indicator
• Note •
Serials 1337 and subsequent with SRV standard
configuration:
The airplane is not equipped with a standby
attitude indicator.
Serials 1337 and subsequent without SRV configuration:
The
standby attitude indicator is mounted on the LH bolster panel.
The attitude indicator gives a visual indication of flight attitude. Bank
attitude is indicated by a pointer at the top of the indicator relative to
the bank scale with index marks at 10°, 20°, 30°, 60°, and 90° either
side of the center mark. A fixed miniature airplane superimposed over
a movable mask containing a white symbolic horizon bar, which
divides the mask into two sections, indicates pitch and roll attitudes.
The upper “blue sky” section and the lower “earth” sections have pitch
reference lines useful for pitch attitude control. The indicator can follow
maneuvers through 360° in roll and 360° in pitch. A knob at the bottom
of the instrument allows adjustment of the miniature airplane to the
horizon bar for a more accurate flight attitude indication.
A PULL TO CAGE knob on the indicator is used for quick erection of
the gyro. When the caging knob is pulled, the pitch and roll indications
will align to within 2° of their respective fixed references.
The instrument is electrically driven and a red GYRO flag indicates
loss of electrical power. Redundant circuits paralleled through diodes
at the indicator supply DC electrical power for gyro operation. 28 VDC
for attitude gyro operation is supplied through the 3-amp Attitude #1
circuit breaker on the Essential Bus and the 3-amp Attitude #2 circuit
breaker on the Main Bus 2.
Revision A5
Summary of Contents for SR20
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