Originally Posted by
zuxrat
1. Do we need to set to the same active freq on NAV1 and NAV2 for VOR we use for approach (for me it’s strange, we can choose VOR2 on EFIS)?
You don't need to have the VOR frequency set on both sides, you need to have it set on the AP side for tracking in VOR/LOC. The same applies to ILS operations, unless you need to engage both APs for an autoland. With the Navigation Display in Expanded or Full ROSE VOR mode, the deviation bar is relation to the frequency and course set on the relative side.
Originally Posted by
zuxrat
2. I found nothing in FCTM connected with VOR approach using raw data. The only recommendation for non-precision approach is to use the HED SEL or LNAV to maintain the radial, but why can’t we use VOR/LOC? It seems much easier. I noticed that Boeing has no recommendations to use VOR/LOC for VOR approach. Yeah, usually we have FMC so we only check the VOR needles and the route is set in FMC, but in case of FMC failures we don’t have all of this.
Recommendation is the key word. You're free to use VOR/LOC if you wish and if your SOP allows you to. It's a tool and if tracking is unsatisfactory you use HDG SEL or fly manually.
Originally Posted by
Check Airman
No 737 experience, but I’ve had to fly raw data in a jet before. If the AP tracks the VOR on approach like it does en route, you’re better off not using it.
It's not always the case, but I had the AP tracking the selected radial 3 degrees to the left. But that's why it's a tool that needs to be monitored. Like all the other modes.