How do you perform the tune and ID step of setting up for an LPV or LNAV/VNAV approach?

• A. Check Channel ID on the chart and compare with the ID visible on the FPL page when loading the approach and on the PFD; verify all the fixes and altitude constraints; if ID is not visible, ensure NAV Preview is not pressed
• B. Only load the approach and trust the onboard ID
• C. Ignore Channel ID and rely on waypoint order
• D. Use a separate GPS unit to verify ID

Answer: (A)

The tune and ID step is about making sure the GPS approach data you’re about to fly actually matches the published procedure. After you load an LPV or LNAV/VNAV approach, you verify the Channel ID shown on the chart, on the FPL (flight plan) page when the approach is loaded, and on the PFD to confirm they all display the same identifier. This cross-check confirms you’ve loaded the intended approach and not a similarly named one. While you’re at it, you also confirm that all the published fixes along the approach and the altitude constraints at those fixes are present in the loaded data, so the navigation guidance will match the charted procedure. If the Channel ID isn’t visible, NAV Preview may be suppressing it, so you disable NAV Preview to reveal the ID. This careful verification is essential because it prevents loading the wrong RNAV path and ensures you have the correct sequence of fixes and altitude restrictions for a safe LPV or LNAV/VNAV approach.