414 Epic E1000 N98FK Crash at Steamboat Springs: LNAV+V Advisory Glidepath Trap

An Epic E1000, N98FK, crashed near Steamboat Springs, Colorado during a night RNAV (GPS) approach. The lateral track was almost perfect, but the vertical profile was fatal: the airplane remained on an LNAV+V “advisory glide slope” and descended below the 9,100-foot MDA into terrain. Max explains what Garmin calls Advisory Vertical Guidance, why LNAV+V can look nearly identical to an LPV on the PFD, and why it does not provide obstacle protection below minimums. He shows the airplane crossed the FAF MABKY and stepdown fix WDCHK essentially on altitude—then continued descending instead of leveling at MDA. Max reviews the three requirements in 91.175(c) for descending below an MDA, explains why many autopilots will fly any coupled glidepath right through minimums unless you intervene, and decodes chart warnings like “Visual Segment – Obstacles” / “34:1 is not clear.” He also shares his own simulator experience flying the RNAV (GPS) Z RWY 32 at KSBS and hitting the same mountain when the autopilot was coupled to the advisory glidepath. If you're getting value from this show, please support the show via PayPal, Venmo, Zelle or Patreon. Support the Show by buying a Lightspeed ANR Headsets Max has been using only Lightspeed headsets for nearly 25 years! I love their tradeup program that let's you trade in an older Lightspeed headset for a newer model. Start with one of the links below, and Lightspeed will pay a referral fee to support Aviation News Talk. Lightspeed Delta Zulu Headset $1299NEW – Lightspeed Zulu 4 Headset $1099 Lightspeed Zulu 3 Headset $949Lightspeed Sierra Headset $749 My Review on the Lightspeed Delta Zulu Send us your feedback or comments via email If you have a question you’d like answered on the show, let listeners hear you ask the question, by recording your listener question using your phone. Mentioned on the ShowBuy Max Trescott’s G3000 Book Call 800-247-6553 Video of the Week: Free Index to the first 282 episodes of Aviation New Talk So You Want To Learn to Fly or Buy a Cirrus seminars Online Version of the Seminar Coming Soon – Register for Notification Check out our recommended ADS-B receivers, and order one for yourself. Yes, we’ll make a couple of dollars if you do. Get the Free Aviation News Talk app for iOS or Android. Check out Max’s Online Courses: G1000 VFR, G1000 IFR, and Flying WAAS & GPS Approaches. Find them all at: https://www.pilotlearning.com/ Social Media Like Aviation News Talk podcast on Facebook Follow Max on Instagram Follow Max on Twitter Listen to all Aviation News Talk podcasts on YouTube or YouTube Premium "Go Around" song used by permission of Ken Dravis; you can buy his music at kendravis.com If you purchase a product through a link on our site, we may receive compensation.