Cirrus DESIGN SR22T Pilot Operating Handbook page 456

Section 9
Supplements
Flashing NAV, REV, or APR
Off navigation course by 50% needle deviation or more.
1. Use HDG mode until problem is identified. Crosscheck raw NAV
data, compass heading, and radio operation.
Flashing NAV, REV, or APR with steady FAIL
Invalid radio navigation signal.
1. Check Nav radio for proper reception. Use HDG mode until
problem is corrected.
Flashing VS
Excessive vertical speed error over selected vertical speed. Usually
occurs in climb.
1. Reduce VS command and/or adjust power as appropriate.
6 of 24
NAV
or
REV
or
APR
NAV
or
REV
or
APR
and
FAIL
VS
Cirrus Design
SR22 / SR22T
P/N 13772-140
Revision 01: 01-06-10