THE PCT CTLR ALERTS A BE40 FLT CREW THAT HAD TUNED IN THE WRONG LOC FREQ FOR RWY 19R VERSUS RWY 19L IAD; VA.

Narrative

ON ARR TO WASHINGTON-DULLES ARPT (IAD); WE WERE GIVEN A HEADING TO INTERCEPT THE RWY 19L LOC AND TRACK INBOUND. MY COPLT MISTAKENLY ENTERED THE LOC FREQ FOR RWY 19R. WE INTERCEPTED AND TRACKED THE RWY 19R LOC. AFTER A FEW MINS; ATC ASKED US WHICH RWY WE HAD REQUESTED. WE TOLD THEM RWY 19L. WE WERE THEN GIVEN A HEADING AND TOLD TO INTERCEPT THE RWY 19L LOC. NOTHING MORE WAS SAID BY ATC ABOUT THE ERROR. I BELIEVE THE CAUSES OF THIS ERROR WERE CREW FATIGUE AND LACK OF CRM. WE WERE BOTH STILL VERY TIRED FROM MULTIPLE TIME ZONE CHANGES AS WELL AS VARYING STARTING AND STOPPING DUTY DAYS. OUR CRM FAILED BECAUSE WE DID NOT BOTH VERIFY THE CORRECT LOC FREQ FOR THE APCH. WE DO NOT NORMALLY BRIEF AND VERIFY FREQS IF WE ARE EXPECTING A VISUAL APCH TO THE ARPT. WE HAVE SINCE STARTED DOING A FULL BRIEFING OF THE ILS OR OTHER INST APCH WE ARE USING FOR GUIDANCE EVEN IF WE ARE EXPECTING A VISUAL APCH. SUPPLEMENTAL INFO FROM ACN 597568: NORMALLY; BOTH CREW MEMBERS VERIFY ALL NAV FREQS. BUT ON THIS LEG; BOTH CREW MEMBERS WERE FATIGUED. THE FREQS WERE NOT VERIFIED BY THE OTHER PLT; NOR DID I ASK HIM TO VERIFY THEM. CRM BROKE DOWN DUE TO THE FATIGUE OF BOTH PLTS. THE FREQ WAS NOT IDENTED; DUE TO THE VFR CONDITIONS AT THE ARPT.