![]() In areas where altimeter error is great enough to warrant a temperature correction, the FAA has established cold temperature operations procedures on those approaches. I'm not sure I agree with the premise of this post. Obviously I'm still struggling with how best to present them to instrument students. There's a glidepath that looks just like the LPV, but you can't intercept it prior to the FAF you can follow the glidepath if you want to, but you don't have to watch out for final stepdown fixes (that you can ignore on an LPV) you're flying a glidepath, but remember you can't go below DA like on an LPV, etc. An IR student is already pretty swamped by material, then you introduce all the weirdness of the +V. This is one reason why, while I understand the intent of the +V approaches, I do feel that they really complicate training. I agree, if there are stepdowns, then it would be silly to increase workload even more by approaching the glidepath from above, adjusting configuration to capture it, then adjusting again to level off prior to each fix (as you would have to do when its warm). The procedures that prompted this question do not have stepdowns in final so I was not considering that. Thanks to those who brought up stepdown fixes. LNAV/VNAV glidepaths, while designed for Baro-VNAV systems, are flown using WAAS in the Garmin GPSes so the same situation applies. So the glidepath itself is unaffected by temperature, however the location of the aircraft along the glideslope for any indicated altitude does vary by temperature. You have basically two choices - do you intercept it from above (which we usually specifically teach not to do with glideslopes), or ignore it?įor CFIs - how do you teach how to use the advisory glideslope on "+V" approaches? Then you reach the FAF and can start descending, however the advisory glideslope is now below you. However, in warm weather, inbound to the FAF, you will first pass through advisory-glideslope intercept, but can't start descending yet. Since these are still non-vertically-guided approaches, the FAF is still where we are to start descending, just like a VOR or LOC-only approach (or LNAV without the +V). No problem, on an ILS/LPV/LNAV-VNAV, you start down at glideslope intercept and follow glideslope.īut then we've got those oddballs, the LNAV+V and LP+V, where Jeppesen/Garmin publish an advisory glideslope that is not evaluated by the FAA. Especially during the summer, glideslope intercept can occur 1/4 to 1/2 mile before the charted FAF (in the winter, of course, it would be past the FAF). When flying an LPV, LNAV/VNAV, or ILS approach, you start on down at glideslope intercept - GS intercept is by definition the FAF for the approach, whether or not you have reached (or passed) the charted FAF.ĭue to altimeter errors caused by non-standard temperatures, the actual point of intercept can vary widely from the charted FAF. For official information, please consult the current Flight Information Publications.I've been teaching instruments a lot lately. Data is for informational purposes only and should not be used as official information in any capacity related to flight operations. Note: Data on this page, including the attached spreadsheets, is derived from Aeronautical Information Services ( AIS) Flight Information Publications. However, procedures can also be published during the interim months through the Operations Change Notice ( OCN) process. New procedures are published for use in the National Airspace System ( NAS) every 56 days through the Terminal Procedures Publication ( TPP) process. Submit form request Publication Dates for New Procedures Request WAAS-enabled LPV or LP approach to your airport Map of European LPVs (enabled by EGNOS).Airports with Global Positioning System ( GPS) or WAAS-enabled LPV/LP approach The availability of Wide Area Augmentation System ( WAAS)-capable approach procedures is a significant enabler of WAAS benefits in the United States. Recreational Flyers & Modeler Community-Based Organizations.Critical Infrastructure & Public Venues.Certificated Remote Pilots including Commercial Operators.Legislation & Policies, Regulations & Guidance.Data & Research Subnav: Data & Research 1.Airport Safety Information Video Series.Passenger Facility Charge (PFC) Program.Airport Coronavirus Response Grant Program.General Aviation & Recreational Aircraft.Vintage & Experimental Aircraft Program.Aviation Safety Draft Documents Open for Comment.
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