![]() ![]() With both CLs and HIRLs, the visibility required drops to RVR 5 without requiring RCLMs. Furthermore, in airline operations with OpSpecs approval, takeoff minima can be further reduced to RVR 10 with Runway Centerline Markings (RCLM) and High Intensity Runway Lights (HIRL) or Centerline Lights (CL). However, the minimum can be reduced to a visibility of one-quarter mile (or RVR 16) with “Adequate Vis Ref.” While the FAA does not define what “adequate visual reference” means, it probably refers to the ability of the pilot to maintain the runway centerline during the take-off. Using Orlando International Airport (KMCO) as an example, standard take-off minima require a visibility of one mile (or RVR 50) for one and two engine airplanes and a visibility of one-half mile (or RVR 24) for three and four engine aircraft. ![]() This is not the case for airline operations (Part 121). Take-off MinimumsĪs Part 91 pilots, under IFR we are legally able to take off in zero-zero conditions, though that’s probably not a wise nor safe decision. Let’s explore in more detail runway markings and their relationship to instrument operations. “runway numbers” and centerline markings. Perhaps we take runway markings for granted simply because we expect them. Needless to say, I’m referring to paved runways, not grass strips nor waterways for seaplanes. Of the many critical items, one that often gets neglected is runway markings-literally the “paint” on the runway, as opposed to runway and taxi lights and signs. As instrument pilots we are aware of many things that are important to safe flying. ![]()
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