As wind gets factored in, even if a round trip with consistent winds, the time to fly becomes longer - headwinds/tailwinds will not cancel out (see: Suppose D = distance, TT = total time, AS = air speed, WS = wind speed, Then the equation for a direct headwind and tail wind is TT = D/(AS - WS) + D/(AS + WS) = 150/(100 - 50) + 150/(100 + 50) = 150/50 + 150/150 = 450/150 + 150/150 = 600/150 = 4, With WS = 0 the equation becomes TT = 150/100 + 150/100 = 300/100 = 3, You will travel 10% of speed in 6 minutes. Navigation and Flight Planning - CFI Notebook (See also the latest AC 91-70, Oceanic and Remote Continental Airspace Operations, for more information on oceanic RNP/RNAV operations. Airplane Flight Controls Lesson - wificfi.com (See 1-1-13). ), Leg types used for procedure design are included in the aircraft navigation database, but not normally provided on the procedure chart, The narrative depiction of the RNAV chart describes how a procedure is flown, The "path and terminator concept" defines that every leg of a procedure has a termination point and some kind of path into that termination point, A Track to Fix (TF) leg is intercepted and acquired as the flight track to the following waypoint, Track to a Fix legs are sometimes called point-to-point legs for this reason, Narrative: "direct ALPHA, then on course to BRAVO WP" [, A Direct to Fix (DF) leg is a path described by an aircraft's track from an initial area direct to the next waypoint, Narrative: "turn right direct BRAVO WP" [, A Course to Fix (CF) leg is a path that terminates at a fix with a specified course at that fix, A Radius to Fix (RF) leg is defined as a constant radius circular path around a defined turn center that terminates at a fix [, A Heading leg may be defined as, but not limited to, a Heading to Altitude (VA), Heading to DME range (VD), and Heading to Manual Termination, i.e., Vector (VM), Narrative: "climb heading 350 to 1500", "heading 265, at 9 DME west of PXR VORTAC, right turn heading 360", "fly heading 090, expect radar vectors to DRYHT INT", Pilots should be aware of their navigation system inputs, alerts, and annunciations in order to make better-informed decisions, In addition, the availability and suitability of particular sensors/systems should be considered, Operators using TSO-C129(), TSO-C196(), TSO-C145() or TSO-C146() systems should ensure departure and arrival airports are entered to ensure proper RAIM availability and CDI sensitivity, Operators should be aware that DME/DME position updating is dependent on navigation system logic and DME facility proximity, availability, geometry, and signal masking, Unique VOR characteristics may result in less accurate values from VOR/DME position updating than from GPS or DME/DME position updating, Inertial reference units and inertial navigation systems are often coupled with other types of navigation inputs, e.g., DME/DME or GPS, to improve overall navigation system performance, Note that specific inertial position updating requirements may apply, An FMS is an integrated suite of sensors, receivers, and computers, coupled with a navigation database, These systems generally provide performance and RNAV guidance to displays and automatic flight control systems, Inputs can be accepted from multiple sources such as GPS, DME, VOR, LOC and IRU, These inputs may be applied to a navigation solution one at a time or in combination, Some FMSs provide for the detection and isolation of faulty navigation information, When appropriate navigation signals are available, FMSs will normally rely on GPS and/or DME/DME (that is, the use of distance information from two or more DME stations) for position updates, Other inputs may also be incorporated based on FMS system architecture and navigation source geometry, Note that DME/DME inputs coupled with one or more IRU(s) are often abbreviated as DME/DME/IRU or D/D/I, Nav Specs are a set of aircraft and aircrew requirements needed to support a navigation application within a defined airspace concept, For both RNP and RNAV designations, the numerical designation refers to the lateral navigation accuracy in nautical miles which is expected to be achieved at least 95 percent of the flight time by the population of aircraft operating within the airspace, route, or procedure [, Typically RNAV 1 is used for DPs and STARs and appears on the charts, Aircraft must maintain a total system error of not more than 1 NM for 95 percent of the total flight time, Typically RNAV 2 is used for en route operations unless otherwise specified, T-routes and Q-routes are examples of this Nav Spec, Aircraft must maintain a total system error of not more than 2 NM for 95 percent of the total flight time, Typically RNAV 10 is used in oceanic operations, See AIM paragraph 4-7-1 for specifics and explanation of the relationship between RNP 10 and RNAV 10 terminology, Use of a suitable RNAV system as a Substitute Means of Navigation when a Very-High Frequency (VHF) Omni-directional Range (VOR), Distance Measuring Equipment (DME), Tactical Air Navigation (TACAN), VOR/TACAN (VORTAC), VOR/DME, Non-directional Beacon (NDB), or compass locator facility including locator outer marker and locator middle marker is out-of-service (that is, the navigation aid (NAVAID) information is not available); an aircraft is not equipped with an Automatic Direction Finder (ADF) or DME; or the installed ADF or DME on an aircraft is not operational, For example, if equipped with a suitable RNAV system, a pilot may hold over an out-of-service NDB, Use of a suitable RNAV system as an Alternate Means of Navigation when a VOR, DME, VORTAC, VOR/DME, TACAN, NDB, or compass locator facility including locator outer marker and locator middle marker is operational and the respective aircraft is equipped with operational navigation equipment that is compatible with conventional navaids, For example, if equipped with a suitable RNAV system, a pilot may fly a procedure or route based on operational VOR using that RNAV system without monitoring the VOR. 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On AeroNav Products charts, very high frequencies and ultra-high frequencies (VHF/UHF) NAVAIDs (e.g., VORs) are depicted in black, while low frequencies and medium frequencies (LF/MF) are depicted as brown. | Privacy Policy | Terms of Service | Sitemap | Patreon | Contact, Aeronautical Information Manual (1-2-2) Required Navigation Performance (RNP), Aeronautical Information Manual (5-1-16) RNAV and RNP Operations, Aeronautical Information Manual (5-5-16) RNAV and RNP Operations, Federal Aviation Administration - Pilot/Controller Glossary, Required Navigation Performance, or RNP, is RNAV with the added requirement for onboard performance monitoring and alerting (OBPMA), RNP standards are required for operation within a certain airspace, A critical component of RNP is the ability of the aircraft navigation system to monitor its achieved navigation performance, and to identify for the pilot whether the operational requirement is, or is not, being met during an operation, RNP capability of the aircraft is a major component in determining the separation criteria to ensure that the overall containment of the operation is met, OBPMA capability therefore allows a lessened reliance on air traffic control intervention and/or procedural separation to achieve the overall safety of the operation, The RNP capability of an aircraft will vary depending upon the aircraft equipment and the navigation infrastructure [, For example, an aircraft may be eligible for RNP 1, but may not be capable of RNP 1 operations due to limited NAVAID coverage or avionics failure.

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