C. FLASHING, FLICKERING, OR INTERMITTENT OPERATION
The image may appear to flicker or flash. If there is more than one flicker, check for loose battery adapter or weak battery. Return the ATN NVM-14 to the maintainer.
D. COSMETIC BLEMISHES
These are usually the result of manufacturing imperfections that do not affect image intensifier reliability and are not normally a cause for rejecting ATN NVM-14. However, some types of blem- ishes can get worse over time and interfere with the ability to per- form the mission. If you believe a blemish is a cause for rejec- tion, record the specific nature of the problem on the mainte- nance forms and identify the position of the blemish by using the clock method and approximate distance from the center (e.g., 5:00 toward the outside, 2:30 near the center, or 1:00 midway).
The following are cosmetic blemishes:
1. Bright Spots
A bright spot is a small, non-uniform, bright area that may flicker or appear constant (Figure 5-3).
Not all bright spots make the ATN NVM-14 rejectable. Cup your hand over the lens to block out all light. If the bright spot remains, return the ATN NVM-14 to the maintainer. Bright spots usually go away when the light is blocked out. Make sure any bright spot is not simply a bright area in the scene you are view- ing. Bright spots are acceptable if they do not interfere with the ability to view the outside scene and the ability to perform the mission.