fix(fmgc): string stars with non-runway-specific approaches

.github/CHANGELOG.md

@@ -40,6 +40,7 @@
 1. [PFD] Improve PFD barberpole rendering and behaviour - @lukecologne (luke)
 1. [FMGC] Only emit decel point when an approach is selected - @tracernz (Mike)
 1. [MCDU] Fix padding of arc radii on F-PLN - @tracernz (Mike)
+1. [FMGC] Allow stringing of STARs with non-runway approaches - @tracernz (Mike)
 
 ## 0.8.0
 

flybywire-aircraft-a320-neo/html_ui/Pages/VCockpit/Instruments/Airliners/FlyByWire_A320_Neo/CDU/A320_Neo_CDU_AvailableArrivalsPage.js

@@ -116,22 +116,27 @@ class CDUAvailableArrivalsPage {
             } else {
                 if (selectedApproach) {
                     const selectedRunway = selectedApproach.runway;
-                    for (let i = 0; i < airportInfo.arrivals.length; i++) {
-                        const arrival = airportInfo.arrivals[i];
-                        if (arrival.runwayTransitions.length) {
-                            for (let j = 0; j < arrival.runwayTransitions.length; j++) {
-                                const runwayTransition = arrival.runwayTransitions[j];
-                                if (runwayTransition) {
+                    if (selectedRunway.length > 0) {
+                        for (let i = 0; i < airportInfo.arrivals.length; i++) {
+                            const arrival = airportInfo.arrivals[i];
+                            if (arrival.runwayTransitions.length) {
+                                for (let j = 0; j < arrival.runwayTransitions.length; j++) {
+                                    const runwayTransition = arrival.runwayTransitions[j];
+                                    if (runwayTransition) {
                                     // Check if selectedRunway matches a transition on the approach (and also checks for Center runways)
-                                    if (runwayTransition.name.match("^RW" + selectedRunway + "C?$")) {
-                                        matchingArrivals.push({ arrival: arrival, arrivalIndex: i });
+                                        if (runwayTransition.name.match("^RW" + selectedRunway + "C?$")) {
+                                            matchingArrivals.push({ arrival: arrival, arrivalIndex: i });
+                                        }
                                     }
                                 }
+                            } else {
+                                //add the arrival even if it isn't runway specific
+                                matchingArrivals.push({ arrival: arrival, arrivalIndex: i });
                             }
-                        } else {
-                            //add the arrival even if it isn't runway specific
-                            matchingArrivals.push({ arrival: arrival, arrivalIndex: i });
                         }
+                    } else {
+                        // the approach is not runway specific so don't attempt to filter arrivals
+                        matchingArrivals.push(...airportInfo.arrivals.map((arrival, arrivalIndex) => ({ arrival, arrivalIndex })));
                     }
                 } else {
                     for (let i = 0; i < airportInfo.arrivals.length; i++) {

src/fmgc/src/flightplanning/ManagedFlightPlan.ts

@@ -1029,20 +1029,24 @@ export class ManagedFlightPlan {
         }
 
         if (arrivalIndex !== -1) {
+            // string the common legs in the middle of the STAR
             const arrival: RawArrival = destinationInfo.arrivals[arrivalIndex];
             legs.push(...arrival.commonLegs);
             legAnnotations.push(...arrival.commonLegs.map(_ => arrival.name));
             // console.log('MFP: buildArrival - pushing STAR legs ->', legs);
-        }
 
-        if (arrivalIndex !== -1 && arrivalRunwayIndex !== -1) {
-            const arrival: RawArrival = destinationInfo.arrivals[arrivalIndex];
-            const runwayTransition: RawRunwayTransition = destinationInfo.arrivals[arrivalIndex].runwayTransitions[arrivalRunwayIndex];
+            // if no runway is selected at all (non-runway-specific approach)
+            // and the selected STAR only has runway transition legs... string them
+            // TODO research IRL behaviour
+            const starHasOneRunwayTrans = arrival.commonLegs.length === 0 && arrival.runwayTransitions.length === 1;
+            const approachIsRunwaySpecific = this.procedureDetails.destinationRunwayIndex >= 0;
+            const runwayTransIndex = arrivalRunwayIndex < 0 && starHasOneRunwayTrans && !approachIsRunwaySpecific ? 0 : arrivalRunwayIndex;
+
+            const runwayTransition = arrival.runwayTransitions[runwayTransIndex];
             if (runwayTransition) {
                 legs.push(...runwayTransition.legs);
                 legAnnotations.push(...runwayTransition.legs.map(_ => arrival.name));
             }
-            // console.log('MFP: buildArrival - pushing VIA legs ->', legs);
         }
 
         let { _startIndex, segment } = this.truncateSegment(SegmentType.Arrival);