Cessna 172R, Operating Handbook

Page: 446 / 500

SECTION 9
-
SUPPLEMENTS
SUPPLEMENT 15
-
FAA APPROVED
CESSNA
MODEL
172R
NOTE
The
following
procedures apply to airplane serials
I
17280831
thru
17281118
incorporating Honeywell
Service Bulletin KC140-M1, and serials 17281119
and on.
The following voice
messages will be annunciated as conditions
warrant:
1. "TRIM IN MOTION"
-
Elevator trim running for more than 5
seconds,
message
repeats every 5
seconds.
2. "CHECK PITCH TRIM"
-
An
out
of trim condition has existed
for approximately
20 seconds, take immediate corrective
action.
a. Airplane Control Wheel
--
GRASP
FIRMLY and regain
aircraft control.
b.
A/P
DISC/TRIM INT Switch
-
PRESS and
throughout recovery.
c. AIRCRAFT
--
RE-TRIM Manually as Needed.
HOLD
d. AUTO PILOT Circuit Breaker
--
PULL.
SECTION
4
NORMAL PROCEDURES
A. PREFLIGHT (PERFORM PRIOR TO
EACH FLIGHT):
1. AVIONICS MASTER
- ON.
POWER APPLICATION AND SELF TEST
--
A self
test
is
performed
upon power application
to
the
computer.
This
test
is a sequence of internal checks that validate proper
system
operation prior
to
allowing normal
system
operation. The
sequence
is indicated by "PFT" with an increasing number
for
the sequence
steps.
Successful completion
of
self
test
is
identified by
all display
segments
being
illuminated
(Display
Test), external
"Pitch Trim"
(A/C System Annunciator Panel)
being
illuminated, and the disconnect
tone
sounding.
S15-20 Revision 2