diff --git a/src/instruments/src/PFD/HeadingIndicator.tsx b/src/instruments/src/PFD/HeadingIndicator.tsx
index 8f2d09b41cb5..c4879642b6bd 100644
--- a/src/instruments/src/PFD/HeadingIndicator.tsx
+++ b/src/instruments/src/PFD/HeadingIndicator.tsx
@@ -347,18 +347,36 @@ interface TrueFlagProps {
 }
 
 class TrueFlag extends DisplayComponent<TrueFlagProps> {
-    private trueRefActive = Subject.create(false);
+    private readonly trueRefActive = Subject.create(false);
+
+    private readonly slatsExtended = Subject.create(false);
+
+    private readonly slatsExtendedWithTrue = Subject.create(false);
+
+    private readonly trueFlagRef = FSComponent.createRef<SVGGElement>();
 
     /** @inheritdoc */
     // eslint-disable-next-line @typescript-eslint/no-unused-vars
     onAfterRender(node: VNode): void {
         this.props.bus.getSubscriber<DisplayManagementComputerEvents>().on('trueRefActive').whenChanged().handle((v) => this.trueRefActive.set(v));
+        // FIXME this should be 127-11 from FWC
+        this.props.bus.getSubscriber<PFDSimvars>().on('slatPosLeft').withPrecision(0.25).handle((v) => this.slatsExtended.set(v > 0.4));
+
+        this.trueRefActive.sub((trueRef) => this.trueFlagRef.instance.classList.toggle('HiddenElement', !trueRef), true);
+
+        this.trueRefActive.sub(this.handleSlatsTrue.bind(this));
+        this.slatsExtended.sub(this.handleSlatsTrue.bind(this));
+        this.slatsExtendedWithTrue.sub((flash) => this.trueFlagRef.instance.classList.toggle('Blink10Seconds', flash));
+    }
+
+    private handleSlatsTrue(): void {
+        this.slatsExtendedWithTrue.set(this.trueRefActive.get() && this.slatsExtended.get());
     }
 
     /** @inheritdoc */
     render(): VNode {
         return (
-            <g id="TrueRefFlag" visibility={this.trueRefActive ? 'visible' : 'hidden'}>
+            <g id="TrueRefFlag" ref={this.trueFlagRef}>
                 <rect x="62.439" y="134.468" width="12.935" height="4.575" class="Cyan NormalStroke" />
                 <text x="68.9065" y="137.008" text-anchor="middle" alignment-baseline="middle" class="FontSmallest Cyan">TRUE</text>
             </g>
diff --git a/src/instruments/src/PFD/animations.scss b/src/instruments/src/PFD/animations.scss
index 97f9bd61f66c..1a2f5c3f9929 100644
--- a/src/instruments/src/PFD/animations.scss
+++ b/src/instruments/src/PFD/animations.scss
@@ -54,6 +54,12 @@
   animation-iteration-count: 9;
 }
 
+.Blink10Seconds {
+  animation-name: blinking;
+  animation-duration: 1s;
+  animation-iteration-count: 10;
+}
+
 .OuterMarkerBlink {
   animation-name: OuterMarkerAnim;
   animation-duration: 460ms;
diff --git a/src/instruments/src/PFD/instrument.tsx b/src/instruments/src/PFD/instrument.tsx
index 5331200e4706..6ce3d0473556 100644
--- a/src/instruments/src/PFD/instrument.tsx
+++ b/src/instruments/src/PFD/instrument.tsx
@@ -221,6 +221,7 @@ class A32NX_PFD extends BaseInstrument {
         this.simVarPublisher.subscribe('irMaintWordRaw');
         this.simVarPublisher.subscribe('trueHeadingRaw');
         this.simVarPublisher.subscribe('trueTrackRaw');
+        this.simVarPublisher.subscribe('slatPosLeft');
 
         FSComponent.render(<PFDComponent bus={this.bus} instrument={this} />, document.getElementById('PFD_CONTENT'));
     }
diff --git a/src/instruments/src/PFD/shared/DisplayManagementComputer.tsx b/src/instruments/src/PFD/shared/DisplayManagementComputer.tsx
index a0abd2515c41..d959417b7783 100644
--- a/src/instruments/src/PFD/shared/DisplayManagementComputer.tsx
+++ b/src/instruments/src/PFD/shared/DisplayManagementComputer.tsx
@@ -29,7 +29,10 @@ export class DisplayManagementComputer {
     init(): void {
         const pub = this.bus.getPublisher<DisplayManagementComputerEvents>();
 
-        this.trueRefActive.sub((v) => pub.pub('trueRefActive', v), true);
+        this.trueRefActive.sub((v) => {
+            pub.pub('trueRefActive', v);
+            this.handleHeading();
+        }, true);
 
         const sub = this.bus.getSubscriber<Arinc429Values & PFDSimvars>();
 
@@ -54,13 +57,12 @@ export class DisplayManagementComputer {
         // and the ADIRU must not be in ATT reversion mode
         const trueRequested = this.irMaintWord.get().getBitValueOr(15, false) || this.trueRefPb.get();
         this.trueRefActive.set(trueRequested && !this.irMaintWord.get().getBitValueOr(2, false));
-        this.handleHeading();
     }
 
     private handleHeading(): void {
         const pub = this.bus.getPublisher<DisplayManagementComputerEvents>();
 
-        pub.pub('heading', this.trueRefActive ? this.trueHeading.get() : this.magHeading.get());
-        pub.pub('track', this.trueRefActive ? this.trueTrack.get() : this.magTrack.get());
+        pub.pub('heading', this.trueRefActive.get() ? this.trueHeading.get() : this.magHeading.get());
+        pub.pub('track', this.trueRefActive.get() ? this.trueTrack.get() : this.magTrack.get());
     }
 }
diff --git a/src/instruments/src/PFD/shared/PFDSimvarPublisher.tsx b/src/instruments/src/PFD/shared/PFDSimvarPublisher.tsx
index 80762033d62b..acddbcb7b46a 100644
--- a/src/instruments/src/PFD/shared/PFDSimvarPublisher.tsx
+++ b/src/instruments/src/PFD/shared/PFDSimvarPublisher.tsx
@@ -146,6 +146,7 @@ export interface PFDSimvars {
     irMaintWordRaw: number;
     trueHeadingRaw: number;
     trueTrackRaw: number;
+    slatPosLeft: number;
   }
 
 export enum PFDVars {
@@ -293,6 +294,7 @@ export enum PFDVars {
     irMaintWordRaw = 'L:A32NX_ADIRS_IR_1_MAINT_WORD',
     trueHeadingRaw = 'L:A32NX_ADIRS_IR_1_TRUE_HEADING',
     trueTrackRaw = 'L:A32NX_ADIRS_IR_1_TRUE_TRACK',
+    slatPosLeft = 'L:A32NX_LEFT_SLATS_ANGLE',
   }
 
 /** A publisher to poll and publish nav/com simvars. */
@@ -442,6 +444,7 @@ export class PFDSimvarPublisher extends SimVarPublisher<PFDSimvars> {
         ['irMaintWordRaw', { name: PFDVars.irMaintWordRaw, type: SimVarValueType.Number }],
         ['trueHeadingRaw', { name: PFDVars.trueHeadingRaw, type: SimVarValueType.Number }],
         ['trueTrackRaw', { name: PFDVars.trueTrackRaw, type: SimVarValueType.Number }],
+        ['slatPosLeft', { name: PFDVars.slatPosLeft, type: SimVarValueType.Number }],
     ])
 
     public constructor(bus: EventBus) {