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Some confusion arises as approach controller gives an air carrier Z turn to 360 degrees for spacing on final and the flight crew does a 360 degree turn in compliance with clearance. Controller catches them going through 160 degree heading.
| Attributes | |
| ACN | 131050 |
| Time | |
| Date | 198912 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : oak |
| State Reference | CA |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : oak |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other descent : approach descent other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 5500 flight time type : 210 |
| ASRS Report | 131050 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| 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 | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
On approach to runway 29 at oak at approximately 12 DME from oak we were at 5500'. Approach requested us to slow to follow traffic. We informed him if we slowed at that point we would be unable to descend the aircraft to the proper descent path. He said if we were unable to slow, we would have to do a 360 degree turn. We said we would make the '360.' he then apparently instructed us to turn to '3-6-0 degrees,' which we interpreted as turn 360 degrees, or turn a '360.' in our turn through about heading 160 degrees, he asked us our heading. We replied. He then said to turn left immediately to 050 degrees. He then vectored us around to intercept the localizer and we landed. Apparently there was confusion with the terminology of 'do a 3-60' vs 'turn to 360,' or '360.'
Original NASA ASRS Text
Title: SOME CONFUSION ARISES AS APCH CTLR GIVES AN ACR Z TURN TO 360 DEGREES FOR SPACING ON FINAL AND THE FLT CREW DOES A 360 DEGREE TURN IN COMPLIANCE WITH CLRNC. CTLR CATCHES THEM GOING THROUGH 160 DEGREE HEADING.
Narrative: ON APCH TO RWY 29 AT OAK AT APPROX 12 DME FROM OAK WE WERE AT 5500'. APCH REQUESTED US TO SLOW TO FOLLOW TFC. WE INFORMED HIM IF WE SLOWED AT THAT POINT WE WOULD BE UNABLE TO DSND THE ACFT TO THE PROPER DSCNT PATH. HE SAID IF WE WERE UNABLE TO SLOW, WE WOULD HAVE TO DO A 360 DEG TURN. WE SAID WE WOULD MAKE THE '360.' HE THEN APPARENTLY INSTRUCTED US TO TURN TO '3-6-0 DEGS,' WHICH WE INTERPRETED AS TURN 360 DEGS, OR TURN A '360.' IN OUR TURN THROUGH ABOUT HDG 160 DEGS, HE ASKED US OUR HDG. WE REPLIED. HE THEN SAID TO TURN LEFT IMMEDIATELY TO 050 DEGS. HE THEN VECTORED US AROUND TO INTERCEPT THE LOC AND WE LANDED. APPARENTLY THERE WAS CONFUSION WITH THE TERMINOLOGY OF 'DO A 3-60' VS 'TURN TO 360,' OR '360.'
Data retrieved from NASA's ASRS site as of August 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.