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A fatigued flight crew confuses their descent clearance into las causing a navigation deviation.
| Attributes | |
| ACN | 329360 |
| Time | |
| Date | 199602 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : bty |
| State Reference | NV |
| Altitude | msl bound lower : 18000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 187 flight time total : 6300 flight time type : 880 |
| ASRS Report | 329360 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 220 flight time total : 8000 flight time type : 2500 |
| ASRS Report | 329260 |
| Events | |
| Anomaly | non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Near 'lidat' intersection (bty 310 degrees at 45 DME) sebound, current clearance was direct bty bty.FUZZY3 las. Controller cleared us to cross 'fuzzy' at FL180, discretion, at 'fuzzy' fly heading 120 degree vectors for the visual. We were in our 13TH hour of duty -- fatigued -- last leg. Due to the distance we were from bty when issued the clearance -- somewhere before reaching bty VOR I thought the vector heading was at the next fix, bty vice fuzzy. So, reaching bty VOR I started flying heading 120 degrees (not following the 115 degree radial on the STAR). A few mins later ZLA asked, 'do you show yourself on course?' the captain during this whole transition was getting ATIS and talking to company. He just told me he was back on ATC frequency, when he heard this question. He did not immediately answer ATC and I told him, very confidently, that we were flying heading 120 degrees (I still thought we were following the clearance). Center then said 'you're about to enter restr airspace, turn right 10 degrees to join the arrival.' I then turned to heading 140 degrees to join, realizing 10 degrees would not work at all. Then center said, 'fly heading 150 degrees to rejoin.' center then asked if we were flying 120 degrees previously and the captain responded, 'sorry for the confusion.' factors -- pure fatigue. I know center said fuzzy, but that fuzzy was a different fuzzy in my head -- bty. Also captain was off getting ATIS and the company call.
Original NASA ASRS Text
Title: A FATIGUED FLC CONFUSES THEIR DSCNT CLRNC INTO LAS CAUSING A NAV DEV.
Narrative: NEAR 'LIDAT' INTXN (BTY 310 DEGS AT 45 DME) SEBOUND, CURRENT CLRNC WAS DIRECT BTY BTY.FUZZY3 LAS. CTLR CLRED US TO CROSS 'FUZZY' AT FL180, DISCRETION, AT 'FUZZY' FLY HDG 120 DEG VECTORS FOR THE VISUAL. WE WERE IN OUR 13TH HR OF DUTY -- FATIGUED -- LAST LEG. DUE TO THE DISTANCE WE WERE FROM BTY WHEN ISSUED THE CLRNC -- SOMEWHERE BEFORE REACHING BTY VOR I THOUGHT THE VECTOR HDG WAS AT THE NEXT FIX, BTY VICE FUZZY. SO, REACHING BTY VOR I STARTED FLYING HDG 120 DEGS (NOT FOLLOWING THE 115 DEG RADIAL ON THE STAR). A FEW MINS LATER ZLA ASKED, 'DO YOU SHOW YOURSELF ON COURSE?' THE CAPT DURING THIS WHOLE TRANSITION WAS GETTING ATIS AND TALKING TO COMPANY. HE JUST TOLD ME HE WAS BACK ON ATC FREQ, WHEN HE HEARD THIS QUESTION. HE DID NOT IMMEDIATELY ANSWER ATC AND I TOLD HIM, VERY CONFIDENTLY, THAT WE WERE FLYING HDG 120 DEGS (I STILL THOUGHT WE WERE FOLLOWING THE CLRNC). CTR THEN SAID 'YOU'RE ABOUT TO ENTER RESTR AIRSPACE, TURN R 10 DEGS TO JOIN THE ARR.' I THEN TURNED TO HDG 140 DEGS TO JOIN, REALIZING 10 DEGS WOULD NOT WORK AT ALL. THEN CTR SAID, 'FLY HDG 150 DEGS TO REJOIN.' CTR THEN ASKED IF WE WERE FLYING 120 DEGS PREVIOUSLY AND THE CAPT RESPONDED, 'SORRY FOR THE CONFUSION.' FACTORS -- PURE FATIGUE. I KNOW CTR SAID FUZZY, BUT THAT FUZZY WAS A DIFFERENT FUZZY IN MY HEAD -- BTY. ALSO CAPT WAS OFF GETTING ATIS AND THE COMPANY CALL.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.