Cessna Nav-O-Matic 400A - User Manual

Cessna.
TAKE
YOUR
CESSNA HOME
FOR
SERVICE
AT THE SIGN
OF
THE CESSNA
SHIELD"
SERVICE
LETTER
MARKETING
DIVISION
* CESSNA
AIRCRAFT
COMPANY
WICHITA,
KANSAS
67201
· CABLE
ADDRESS
/ CESSCO
WICHITA
August
18,
1972
SUBJECT:
400A AUTOPILOT
MOISTURE SUMP TNSTALLATION
AIRCRAFT
AFFECTED:
Those
below which
are equipped
with
400A Autopilot
thru 310Q0463
thru
340-0051
thru 401B0215
402-0001
thru 402B0216
414-0001
thru 414-0262
421-0001
thru
42130232
REASON FOR LETTER:
A moisture
sump has recently been added
to the static system for the 400A
Autopilot
computer.
This change
is designed
to prevent
moisture
from accumulating
in
the com-
puter altitude
chamber
and causing
erratic altitude
hold operation.
A Service Kit (SK421-46)
has been
developed for incorporating
this
same moisture
sump on earlier
in-service aircraft.
ACTION REQUIRED:
For owners who have
experienced autopilot
pitch stability
problems, it
is recommended
that SK421-46
be installed
at
the next
convenient
inspection
period.
PARTS INFORMATION:
SK421-46 can be
obtained through
the Cessna Dealer
Organization at a
suggested list
price of $3.10 (A).
REMARKS:
While the above
change is a beneficial
improvement,
proper service
and maintenance
continues to
be the most important
means of insuring
maximum performance
and reli-
ability of the autopilot system.
As an additional aid to service
personnel in maintaining the 400A
Autopilot, a
Troubleshooting Guide
has been attached.
This.Guide
provides up-dated
troubleshooting
and servicing information which
can be used in diagnosing and correcting
problems in
the field.
This information
should be inserted
in the 400A Autopilot
Service/Parts
Manual in
place of existing
corresponding
pages.
The
Service/Parts Manual will also reflect
these changes with the next
revision.
(Owner Notification System - No. 1)
ALL PRICES SUBJECT TO CHANGE WITHOUT NOTICE
** *******
THE
CESSNA AIRCRAFT
COMPANY
THERE ARE
MORE CESSNAS
FLYING
THAN ANY
OTHER MAKE
310P0001
340-0001
401--0001
I

Cessna Nav-O-Matic 400A Specifications