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F100 flight crew turns to the incorrect heading for a direct to 'jen' when using their FMS. The controller's clearance had been 'when receiving jen.' the direct to jen differed when FMS was compared to VOR. Aircraft was at 3000 ft, climbing.
| Attributes | |
| ACN | 389721 |
| Time | |
| Date | 199712 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : act |
| State Reference | TX |
| Altitude | msl bound lower : 3000 msl bound upper : 15000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : act |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 389721 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| ASRS Report | 389720 |
| Events | |
| Anomaly | non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Location: act VOR. Departing act we were assigned a heading of 305 degrees by departure control. We were instructed to fly that heading until receiving jen then proceed direct. As the PF and the autoplt not on, the first officer selected direct jen and selected navigation. I started a turn and followed the V bars. The first officer mentioned that things did not look right. At that point ATC questioned our heading and said fly 305 degrees until receiving jen. The first officer acknowledged the error and I turned on course using raw data. I should have checked raw data before following the V bars. ATC made no mention of a problem. Continued flight to dfw. Supplemental information from acn 389720: as PNF, I should have selected raw data first and backed it up with the FMC. Not doing this caused the captain to fly the wrong heading.
Original NASA ASRS Text
Title: F100 FLC TURNS TO THE INCORRECT HEADING FOR A DIRECT TO 'JEN' WHEN USING THEIR FMS. THE CTLR'S CLRNC HAD BEEN 'WHEN RECEIVING JEN.' THE DIRECT TO JEN DIFFERED WHEN FMS WAS COMPARED TO VOR. ACFT WAS AT 3000 FT, CLBING.
Narrative: LOCATION: ACT VOR. DEPARTING ACT WE WERE ASSIGNED A HDG OF 305 DEGS BY DEP CTL. WE WERE INSTRUCTED TO FLY THAT HEADING UNTIL RECEIVING JEN THEN PROCEED DIRECT. AS THE PF AND THE AUTOPLT NOT ON, THE FO SELECTED DIRECT JEN AND SELECTED NAV. I STARTED A TURN AND FOLLOWED THE V BARS. THE FO MENTIONED THAT THINGS DID NOT LOOK RIGHT. AT THAT POINT ATC QUESTIONED OUR HEADING AND SAID FLY 305 DEGS UNTIL RECEIVING JEN. THE FO ACKNOWLEDGED THE ERROR AND I TURNED ON COURSE USING RAW DATA. I SHOULD HAVE CHKED RAW DATA BEFORE FOLLOWING THE V BARS. ATC MADE NO MENTION OF A PROB. CONTINUED FLT TO DFW. SUPPLEMENTAL INFO FROM ACN 389720: AS PNF, I SHOULD HAVE SELECTED RAW DATA FIRST AND BACKED IT UP WITH THE FMC. NOT DOING THIS CAUSED THE CAPT TO FLY THE WRONG HEADING.
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.