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Demist
Shields
Compass
IR Spot/Flood Lens
Sacrificial
window
LIF
Figure 2-3. Installation of Demist Shields, Sacrificial
window
D. Installation of the Demist Shields. Perform the following pro-
cedure to install the demist shields on the diopter lenses. Refer to
Figure 2-3.
CAUTION
IF THE DEMISTING SHIELDS NEED TO BE CLEANED, MAKE
SURE THE SHIELDS ARE DRY AND USE DRY LENS PAPER. IF
THE DEMIST SHIELDS ARE WIPED WHILE WET OR WITH WET
LENS PAPER, YOU WILL DAMAGE THE COATING.
NOTE
If inclement operating conditions are known to exist (e.g. significant
temperature change and high humidity), install the demist shields to
minimize diopter lens fog prior to execution of mission.
1. Carefully remove the eyecups.
2. Carefully press a demist shield onto each eyepiece. Be careful
not to smudge the eyepieces or demist shields.
3. Replace the eyecups (see paragraph 2-6, C).
2-13
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