TM 1-1520-218-10
3C-193
Figure 3C-142. Zeroizing or Locking Up System
Data
NOTE
A zeroize command involving the CDU will
erase any associated nonvolatile memory
in the CDU.
All functions on this page will delete
significant amounts of data stored in the
CDU
or
other
subsystem
nonvolatile
memory. They all require confirmation
prior to execution by pressing the same
key a second time to acknowledge the
confirmation message.
Table 3C-105. Zeroizing or Locking Up System
Data Procedure
NO.
DESCRIPTION/FUNCTION
1
Pressing IDX function key will access the
Index page.
2
To access the Lock/Zeroize page.
3
Request zeroization of all CDU data,
V/UHF presets and keys, and GPS SA/AS
keys.
4
Request zeroization of communication
data, including presets and V/UHF HAVE
QUICK data.
5
Request zeroization of GPS SA/AS keys.
6
Confirm desire to zeroize markpoint and
user waypoint lists.
7
Password entry locks/unlocks the system.
8
Request zeroization of markpoint and user
waypoint lists.
9
Request zeroization of flight plan and
alternate flight plan.
3C-26. PILOT'S ALTIMETER (BA-141).
a. Description. The pilot's altimeter provides a
servoed counter drum/pointer display of barometrically
corrected pressure altitude. Refer to Figure 3C-143.
In addition, it provides the transponder with altitude
information for mode C operation. The barometric
pressure (altimeter setting) is set manually with the
BARO knob and displayed in units of inches mercury
and millibars on counter-drum indicators. The
altimeter is ac powered through a 1 -ampere circuit
breaker, placarded PILOT ALTM, located on the
overhead circuit breaker panel, Figure 2-16.
b. Pilot's Altimeter Controls, Indicators, and
Functions.
(1) Failure Warning Flag. A failure warning
flag, placarded OFF, comes into view to indicate that
the altitude information is unreliable, however, the
mode C information may be valid.
