2020年3月20日 · The main drivers to define turns with a fixed radius over ground are airspace usage optimization and challenging terrain or obstacle situations. RF legs have first been appearing in "Required Navigation Performance Authorization Required" (RNP AR) procedures [2], but are now quite often part of “regular” RNP departures, arrivals and approaches.

RNAV Leg Types. A leg type describes the desired path proceeding, following, or between waypoints on an RNAV procedure. Leg types are identified by a two-letter code that describes the path (e.g., heading, course, track, etc.) and the termination point (e.g., the path terminates at an altitude, distance, fix, etc.).

An RF leg is defined as a constant radius circular path, around a defined turn center, that starts and terminates at a fix. An RF leg may be published as part of a

An RF leg is defined by a radius, arc length, and a fix. Not all RNP capable FMS systems support RF legs. Use of RF legs is allowed prior to the Final Approach Fix.

constructed with Radius-to-Fix (RF) leg types and procedures using Track-to-Fix (TF) leg types. Please see attached recommendation document for a complete discussion of RF/TF concurrent operations along with the PARC’s recommendation to the FAA.

2019年5月19日 · Radius-to-fix (RF) leg capability allows for a constant radius turn starting and ending on a fix or waypoint. The FMS computes the actual flight path, providing for repeatable and predictable turn performance.

2011年7月18日 · The arc on a RF leg can be based on a radius equal to twice the RNP for the segment and is limited in bank angle below 500 feet to less than or equal to 3 degrees, but above 500 feet it can be up to 25 degrees and in a missed approach segment it …

2014年12月30日 · The RF leg type is used on new Required Navigation Performance (RNP) approaches that fly curved paths. Turn radius is dependent on airspeed, winds and bank angle. The navigator will direct the pilot (or flight director or autopilot) to vary the bank angle to fly the correct curved track over the ground.

2018年4月23日 · RF 航段是从一个定位点以某一点为圆心，某一特定值为半径，飞行至另一个定位点的航段，可满足在地形复杂、偏远机场的越障需求，能够大幅提升航班运行能力与飞行安全。 据了解，随着吉祥航空特殊运行机场的不断增加，各种运行过程中的地形限制及潜在风险也日益受到重视。 因此，为了有效加强在空中大侧风情况下的航径控制，降低可控飞行撞地风险，吉祥航空于组织开展了RNP APCH进近方式进行新增RF航段能力的补充运行合格审定工作。 通过风险评 …

RNP AR APCH with RF Legs •For approaches where RF legs are used (indicated on chart): –Navigation system must have the capability to execute RF legs between two fixes –Aircraft must have an electronic map –The FMC, flight director and Autopilot must be capable of commanding 25° of bank at or above 400’ AGL and 8° of bank below 400 ...