Clean the lens in small sections; use cleaning solution and gently wipe in a
single direction with a clean cotton pad.
In temperatures below 32€ F (0€ C), add glycerine to the cleaning water for
other than optical elements to prevent freezing. On lenses, use a mixture
of lens cleaning solution and warm (not hot) water.
Refer to TM 43-0139.
c. Panel Markings.
Use only in well-ventilated area away from heat or
Avoid prolonged breathing of vapor and
contact with the skin.
When necessary, clean the surface to be repainted with xylene and apply
panel markings using the appropriate marking ink.
d. Purge and Fill.
The purge and fill procedures consist of two
evolutions: the LD/R low pressure purge; and the LD/R depressurization, high
pressure purge, and fill.
(1) The LD/R low pressure purge uses 5 psig nitrogen to purge the low
pressure cavity of the LD/R of air.
It also includes a leak check
procedure. Figure 1-13 illustrates the test setup for the LD/R low pressure
purge and leak check.
Escaping gas may blow dirt or dust particles into the
Use caution when venting nitrogen from the gas
charging assembly components or LD/R.
Once you set up the equipment as shown in figure 1-13, you must purge the
purge and fill equipment. You accomplish this by allowing nitrogen to bleed
through the system for five seconds, allowing it to escape via the purge