fix(fm): ils auto-selection robustness (#8080)

* fix(fm): improve ils selection robustness

* fix(fm): fix criteria for rendering selected navaid

Author: tracernz

.github/CHANGELOG.md

@@ -17,6 +17,7 @@
 1. [LIGHTS] Fixed trim decal emissive and floods - @FinalLightNL (FinalLight#2113)
 1. [EFB] Fixed Simbridge failing to connect if remote setting is enabled then disabled - @DevonDF (Devon#9451)
 1. [SIM] fix(sim): only shown nav radio tip once @tracernz (Mike)
+1. [FMS] Improved robustness of ILS selection - @tracernz (Mike)
 
 ## 0.10.0
 

fbw-a32nx/src/base/flybywire-aircraft-a320-neo/html_ui/Pages/VCockpit/Instruments/Airliners/FlyByWire_A320_Neo/CDU/A320_Neo_CDU_SelectedNavaids.js

@@ -53,7 +53,7 @@ class CDUSelectedNavaids {
         const selectedNavaids = mcdu.getSelectedNavaids();
 
         for (const [i, navaid] of selectedNavaids.entries()) {
-            if (navaid.frequency === null) {
+            if (navaid.frequency < 1) {
                 continue;
             }
 

fbw-a32nx/src/systems/fmgc/src/navigation/LandingSystemSelectionManager.ts

@@ -70,11 +70,15 @@ export class LandingSystemSelectionManager {
                     await this.selectDepartureIls();
                 } else if (phase >= FmgcFlightPhase.Descent) {
                     await this.selectApproachIls();
-                } else if (this.pposValid) {
+                } else if (this.pposValid && phase >= FmgcFlightPhase.Cruise) {
                     const destination = this.fpm.getDestination(FlightPlans.Active);
                     if (destination && distanceTo(this.ppos, destination.infos.coordinates) <= LandingSystemSelectionManager.DESTINATION_TUNING_DISTANCE) {
                         await this.selectApproachIls();
+                    } else if (this._selectedIls !== null) {
+                        this.resetSelectedIls();
                     }
+                } else if (this._selectedIls !== null) {
+                    this.resetSelectedIls();
                 }
             } catch (e) {
                 console.error('Failed to select ILS', e);
@@ -117,8 +121,8 @@ export class LandingSystemSelectionManager {
         const airport = this.fpm.getDestination(FlightPlans.Active);
         const approach = this.fpm.getApproach(FlightPlans.Active);
 
-        if (this.isTunableApproach(approach?.approachType) && this.setIlsFromApproach(airport, approach, true)) {
-            return true;
+        if (this.isTunableApproach(approach?.approachType)) {
+            return this.setIlsFromApproach(airport, approach, true);
         }
 
         // if we got here there wasn't a suitable ILS

fbw-a32nx/src/systems/fmgc/src/navigation/NavaidTuner.ts

@@ -386,7 +386,7 @@ export class NavaidTuner {
         for (const [i, mmr] of this.mmrTuningStatus.entries()) {
             const autoFacility = this.landingSystemSelectionManager.selectedIls ?? undefined;
             const autoCourse = this.landingSystemSelectionManager.selectedLocCourse;
-            if (!mmr.manual && mmr.facility?.icao !== autoFacility?.icao && autoCourse !== null) {
+            if (!mmr.manual && mmr.facility?.icao !== autoFacility?.icao && (autoCourse !== null || autoFacility === undefined)) {
                 mmr.databaseCourse = autoCourse;
                 mmr.databaseBackcourse = this.landingSystemSelectionManager.selectedApprBackcourse;
                 mmr.course = mmr.databaseCourse;