Beechcraft C-12C Operator And Technical Reference Manual page 324

TM 1-1510-218-10
(j) Multiple waypoints (waypoints that
serve as members of any combination of high and low
altitude waypoints,
intersections).
c. Configuring the Data Base.
worldwide navigation data contained on the diskette
will fit into the FMS system's internal data base
(memory) at one time. It is necessary to choose which
geographical regions and which navigational elements
within those geographical regions are desired to be
loaded at one time. The diskette may be used as
often as necessary during the 28-day valid period.
d. Supplemental Data Base. In addition to the
published navigation data base the FMS has an
additional nonvolatile memory capacity that may be
utilized for storing waypoints, flight plans, and other
user defined data. This additional memory can store
100 flight plans, 800 waypoints, and 175 user-defined
navaids and airports.
e. Data Base Revision Cycle. Every 28 days,
several days prior to the effective date of the next
revision, a diskette is sent to each data base
subscriber that includes a complete new set of
worldwide data. The update should be accomplished
before the effective date of the revision. If the FMS is
not in operation at 0000 GMT on the effective date, the
system automatically switches to the revised data. If
the FMS is in operation at 0000 GMT on the effective
date, the system automatically switches to the revised
data the next time it is turned on. If the FMS does not
3B-34
Figure 3B-18. FMS Control Display Unit (KR 87)
DR/STAR's, or approach
Not all the
1. Message Key and Annunciator
2. Cursor Key
3. Mode Key
4. Sensor Key
5. OBS/LEG Key
6. Frequency Key
7. Brightness Control Switch
8. Power Switch
9. Numeric Entry Keys
10. Alphabetic Entry Keys
11. ENTER Key
12. Clear Key
13. Hold Key
14. Data Key
15. Navigation Key
16. Waypoint Key
17. Flight Plan Key
18. Direct Key
19. Display Screen
get updated with the latest revision data prior to the
effective date, the system will continue to function but
will provide a message stating: D/BASE OUT DATED.
f. Data Base Battery. A small battery located
internally in the FMS computer keeps the data base
alive when power is removed from the system. Typical
battery life is 6 years.
battery life remains, the system will display a message
stating: D/BASE BATT
technicians should replace the battery at this time.
g. ICAO Identifiers. In order to access data
from the data base it is necessary to use International
Civil Aviation Organization (ICAO) identifiers. In most
cases the proper ICAO identifiers may be taken
directly from navigation publication such as high
altitude charts, low altitude charts, area charts,
approach plates, DR's, STAR's, and other references.
(1) Airport ICAO
reference points are stored by the airport ICAO
identifier. The majority of airport identifiers have four
letters beginning with a prefix letter that corresponds to
the geographic area in which it is located (for example,
KJFK). The prefix letter for the continental United
States is "K". The prefix letter for Hawaii and Alaska is
"P". Some airport identifiers are a combination of
three or four letters and numbers such as 3LA, 7TX6,
or M33. Most published airport identifiers in the
continental United States are in the official ICAO
format. The exception is an airport identifier that
consists of only three letters and no numbers, such as
When about one week of
LOW. Maintenance
Identifiers. Airport