11/18/2023 0 Comments Aviation ballpark or touchdown meaning![]() ![]() The VGS is a narrow inclined plane centered on the runway centerline that is evaluated for obstructions between the DA/VDP and LTP for all straight-in aligned approach procedures. The VDP is a defined point on the final approach course of a nonprecision straight-in approach procedure from which normal descent from the MDA to the runway touchdown point may be commenced, provided visual reference is established. The highest runway centerline elevation in the first 3000 feet of the landing surface (touchdown zone). For helicopter procedures it is identical to the landing area. The first 3000 feet of runway beginning at the threshold. Those operational documents are binding,(explicitly stated in 14 CFR 139) and it is strongly implied that those operational documents must follow the guidelines of the referenced AC on Standards for Airport Markings.ĪH HAA! More applicable to flight operations than airport operations: (Procedure design standards) FAA Order 8260.3E appendix B-11 But the key part is that an airport requires a set of approved documents that cover the details of the airport. Now these provide some nice bureaucratic circular references to each other. The specifics use these documents.Īnd 14CFR 152 incorporates a list of Advisory Circulars by reference(Making those ACs regulatory) It is 3000 feet, but there must be a minimum length blank space in the middle so the TDZ can be less than 3000ft for shorter runways or runways with displaced thresholds. I would need to search a bit more but touchdown zone elevation as given on approach plates is measured at a specific point, which if I recall is at the aiming point.(1000ft)įor the airport operator, touchdown zone markings are required only for runways with precision approaches. The interpretations I gather indicate that the touchdown zone means different things in different contexts. The touchdown zone referenced in 91.175c applies to 135 and 121 operations and they will have clarification in their op specs.(Which are also legally binding FAA approved documents.) Part 91 operation only requires "The aircraft is continuously in a position from which a descent to a landing on the intended runway can be made at a normal rate of descent using normal maneuvers". ![]() The first 3,000 ft of the runway beginning at the threshold.Īlso of note, the runway touchdown zone markings on long precision runways generally extend to 3,000 ft beyond the threshold. The TDZ is referred to as a point 500-3,000 ft beyond the runway threshold not to exceed the first one-third of the runwayģ,000 ft beyond the landing threshold or to the midpoint of the runway, whichever is less. ![]() A few of these include:ĪC 91-79A (referencing an obsolete document): These uses or definitions are generally similar, but include variances. However, several uses or definitions of this term do exist in various FAA advisory documents. Is this zone explicitly defined? If so, where is the applicable definition found? (1) The aircraft is continuously in a position from which a descent to a landing on the intended runway can be made at a normal rate of descent using normal maneuvers, and for operations conducted under part 121 or part 135 unless that descent rate will allow touchdown to occur within the touchdown zone of the runway of intended landing Except as provided in §91.176 of this chapter, where a DA/DH or MDA is applicable, no pilot may operate an aircraft, except a military aircraft of the United States, below the authorized MDA or continue an approach below the authorized DA/DH unless. In 14 CFR 91.175 the FAA requires-in certain cases-that pilots must be in a position to land within the " Touchdown Zone": The checker found no problems in this document.Does the FAA give a regulatory definition of the term " Touchdown Zone" for use within the context of landing operations? Acrobat Accessibility Report Accessibility Report Filename: AC_120-FPM_Coord_Copy.pdf Report created by: Organization: ![]()
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