Change 4 4-18.1/(4-18.2 Blank)

CONTROL  FUNCTION 
Focus Control  Used to manually set focus. 
CAGE  Commands the TFU to a particular 
pointing angle with respect to the 
aircraft centerline. 
POLARITY  Toggles  thermal  image  polarity 
from  white-hot  or  black-hot, 
representing  hot  scene  objects. 
White-hot  is  the  recommended 
polarity. 
FOC IN  Acts  only  on  the  IR  sensor. 
Manually  adjusts  the  focus  for 
operational work. 
FOC OUT  Acts  only  on  the  IR  sensor. 
Manually  adjusts  the  focus  for 
operational work. 
IP/HH  Toggles between inertial pointing 
mode and heading hold mode. 
Gain  and  level  Gain sets system sensitivity, while 
control  level is used to position a selected 
span of temperatures relative to all 
temperatures in the scene. 
GAIN UP  Higher  gains  represent  narrower 
spans of temperatures. 
GAIN DN  Lower gains represent wider spans 
of temperatures. 
LVL UP  In  the  recommended  white-hot 
mode,  higher  levels  settings  are 
needed  to  view  detail  in  darker 
(cold) areas. 
LVL DOWN  In  the  recommended  white-hot 
mode,  lower  level  settings  are 
needed to view detail in brighter 
(hot) areas. 
AUTO-GAIN  Selects automatic control of system 
gain and level (temperature offset). 
The  system automatically adjusts 
the FLIR image with near optimum 
scene contrast for general purpose 
viewing, and as a starting point for 
manual adjustment. 
Pointing Control  Used  to  manually  control  TFU 
movement. 

4.6.3 Starting Procedure.
1.
FLIR PWR switch -ON.

2.
MFD FLIR switch -Press.

NOTE
The start-up BIT is performed at power up and the RDY indicator should be displayed in the right end of the upper status bar. If FAULT is displayed the system has detected a problem and should be checked by main-tenance personnel.
Allow three to .ve minutes for system to reach operating temperature. Do not move controls until RDY is displayed.
3.
Adjust MFD BRT knob.

4.
Use the pointing control to con.rm up/down and left/right operation of the TFU. As soon as inputs are received from the pointing control the system will switch from cage mode to iner-tial pointing mode.

5.
Any mode can now be selected and controls can be adjusted to suit operational needs.

4.6.4 Modes of Operation.
4.6.4.1 BIT Mode. The start up BIT is performed at power up and the READY indication should be displayed in the right end of the upper status bar (Figure 4-7). If FAULT is displayed the system has detected a problem. See the appropriate maintenance manual.
4.6.4.2 Menu Operation. Menus are accessed and ma-nipulated with the MENU, HOOK, and LOCK switch and the pointing control located on the HCU. The menus are organized into two basic pages (Figure 4-8), with additional sub-menus that are presented at the appropriate time by a 9>9 to indicate that a sub-menu exists. The menus contain one or more labels, the labels are highlighted one at a time. If a label can not be highlighted or does not appear, then that function is not currently available. The HOOK func-tion is used to select or change parameters and to open sub-menus. The LOCK function is used to execute a change or selection and close the menus.
　
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