Final answer:
Parallel runway lights or markers are used in aviation engineering to guide pilots during takeoff and landing. FAA regulations state that there should be a minimum of 12 lights or markers, spaced 400 feet apart. The lights help pilots differentiate between parallel runways.
Step-by-step explanation:
In aviation engineering, parallel runway lights or markers are used to provide guidance and visual cues to pilots during takeoff and landing. These lights or markers are essential for maintaining safe separation between parallel runways.
According to the Federal Aviation Administration (FAA) regulations, parallel runway lights or markers shall not be less than 12 lights or markers and not less than 400 feet apart. The spacing ensures that pilots can easily differentiate between the two runways and maintain proper alignment.
For example, if a runway has 3,000 feet between its thresholds, it would require 6 sets of parallel runway lights or markers, with each set consisting of 12 lights or markers, spaced 400 feet apart.