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Chua Astro: Paraguay 34
19
20
21
22
TM 1-1520-238-10
Table 3-21. Datum Names and Codes (cont)
Datum Datum Code Used
Name/Description By Navigation
System
Corrego Alegre: Brazil 35
Provisional South American 1956 36
Yacare: Uruguay 37
Tananarive: South American 38
1925
Timbali: East Malaysia 39
Tokyo: Japan: Korea: Okinawa 40
Voirol 41
Special Datum: Indian Special 42
Special Datum: Luzon 43
Tokyo Datum 44
WGS 84 Special Datum 45
Sino-Soviet Bloc 46
WGS 84 Standard Datum* 47
* All FAA Sectionals and FLIP use this datum for coordinate
data.
3.16.5 COMPUTER DISPLAY UNIT (CDU) IP-1552G
The CDU IP-1552G (fig 3-24.1) used in the integrated
navigation system equipped aircraft has five additional
FABs to assist the operator with aircraft systems functions.
The additional FABs are: TGT, CODE, DATA,
PGM, and WPN. Data upload can be accomplished
manually through the CDU alphanumeric keyboard or
electronically through the Data Transfer Unit (DTU)).
Functions of each FAB is described in table 3-22. VAB
functions are described with each page/sub page display
description.
3.16.6 Navigation System Initialization. When
electrical power is applied to the helicopter, the CDU is
powered and the NAV top level page is displayed as
shown in figure 3-25.
a.
If DTC overwrites active FLY-TO or TGT,
it is necessary to de-select and re-select
active FLY-TO or TGT.
At initial power-up mode of the aircraft, power is
automatically applied to the EGI. The HARS is powered
when an alignment mode is selected, and the DNS
is automatically powered during the HARS startup sequence.
The CDU will default to the top level NAV page
and will be displayed as shown in figure 3-25.
NOTE
Change 4 3-64.1
TM 1-1520-238-10
Control/Display
Display Screen
Keyboard
Left/Right Arrows
Up/Down Arrows
BRT Control
COM
NAV
IFF
ATHS
TGT
CODE
Figure 3-24.1. CDU IP-1552G, Used with AN/ASN-137 DNS
Table 3-22. IP-1552G CDU Control and Display Functions
M01-0326
Function
Display formats are organized as pages with 8 display lines; the bottom line is always
used as the scratchpad for entering or editing data.
Alphanumeric keyboard is used for entering data.
Move the cursor one space left or right, as appropriate, per keystroke. When pressed
constantly, will move the cursor at about 4 character positions per second.
Scroll through the waypoint dictionary pages, one page per keystroke. When constantly
pressed, will scroll through all dictionary pages at about two pages per second.
Adjust display brightness.
Not Used.
Displays NAV top level page.
Not Used.
Not Used.
Access to Target List page.
Access to Laser Code page.
3-64.2 Change 3
1
TM 1-1520-238-10
corrections computed by the DNS computer and are
applied to all subsequent Doppler radar velocities. The
velocity bias (error), when present, will be most
noticeable when the helicopter is at a hover or slow
speeds. The reason is that at a hover the velocity error,
although small is about the same amount as the actual
helicopter velocity. When HBCM is selected, the CPG
can manually start and stop the calibration. If a
calibration NO-GO status is displayed at the conclusion,
a recalibration may be restarted by the CPG. If a GO
calibration is computed, the bias velocities will
automatically be stored and applied continuously to all
subsequent navigation computations.
Table 3-22. IP-1552G CDU Control and Display Functions
Control/Display Function
Display Screen Display formats are organized as pages with 8 display lines; the bottom line is always
used as the scratch pad for entering or editing data.
Keyboard Alphanumeric keyboard is used for entering data.
Left/Right Arrows Move the cursor one space left or right, as appropriate, per keystroke. When pressed
constantly, will move the cursor at about 4 character positions per second.
Up/Down Arrows Scroll through the way point dictionary pages, one page per keystroke. When constantly
pressed, will scroll through all dictionary pages at about two pages per second.
BRT Control Adjust display brightness.
COM Not Used.
NAV Displays NAV top level page.
IFF Not Used.
ATHS Not Used.
TGT Access to Target List page.
CODE Access to Laser Code page.
FDLS Access to Aircraft Fault Detection and Location System functions.
DATA Access to Data Menu Top Level page.
SPC Used only for entry of coordinate ID or FDLS/BST operations.
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