Selecting Equipment
NVIS implementation entails the selection of specific technologies and equipment. According to Stubbs, these need to be customized to the users’ operation, in terms of their mission, goal, and capabilities. Then it is important to conduct an aircraft survey.
NVIS technological solutions include
internal and external modifications. With internal modifications, all of the instruments and avionics are internally modified for normal or NVIS operations.
Finally, and maybe even more importantly: What is their normal process when an instrument or avionics use fails? Do they have a local facility to make the repair? Are they on a pay-by-the-hour maintenance program? Do they have to ship their units out of the country for repair/ overhaul? “All of these factors should be taken into play when designing an NVIS solution to the aircraft,” Stubbs says.
External modifications are the most frequently used and include post-lights/ eyebrow lights, bezels and filters. Post- lights/eyebrow lights are a traditional method to modify the crew station that predate NVGs. Bezels also predate NVGs and there are several different variations of bezels. The most frequent is a bezel that mounts to the face of the instrument with light emitting from the center to illuminate
the instrument face. The full instrument bezel actually mounts to the instrument panel and fits around the instruments still illuminating the face. Filters are externally mounted and may be attached with aluminium bezels. Stubbs says, “All internal and external modifications are viable methods, but the operator must consider all the intricacies of its operation to make the best decision and ensure its aircraft are available for their intended mission in lieu of sitting in a hangar awaiting parts.”
72
Nov/Dec 2018
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