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Westwind X non adherence to ATC clearance radar vector had less than standard separation with Y. Pilot deviation.
| Attributes | |
| ACN | 269135 |
| Time | |
| Date | 199404 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : apa |
| State Reference | CO |
| Altitude | msl bound lower : 7800 msl bound upper : 7800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : den tower : apa tower : cdg |
| Operator | common carrier : air taxi |
| Make Model Name | Otter DHC-3 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | climbout : initial |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | PA-44 Seminole Turbo Seminole |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : ground |
| Qualification | controller : non radar |
| Experience | controller non radar : 10 |
| ASRS Report | 269135 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : non radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : far non adherence : clearance other spatial deviation |
| Independent Detector | other other : unspecified atc |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 1500 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Local control cleared a westwing jet X for takeoff and assigned a heading saying 'turn right heading two niner zero'. The pilot responded 'two niner zero, cleared for takeoff.' without reading back the direction of the turn. Local assigned a frequency change to departure frequency when the westwing was still on runway heading about 1 mi south. The westwing continued on runway heading and subsequently, approximately 3 mi south began a left turn and came very close to a previous IFR departing piper seminole. When asked by departure, the westwing pilot claimed to have been given a zero niner zero heading. I believe the pilot may have read back 'to niner zero' instead of 'two niner zero'. Obviously these sound the same. Two actions could help to prevent this misunderstanding. Pilots should read back not only the heading but the direction of the turn as well. Controllers, if they are assigning turns, should keep the aircraft on their frequency until a turn is commenced.
Original NASA ASRS Text
Title: WESTWIND X NON ADHERENCE TO ATC CLRNC RADAR VECTOR HAD LTSS WITH Y. PLTDEV.
Narrative: LCL CTL CLRED A WESTWING JET X FOR TKOF AND ASSIGNED A HDG SAYING 'TURN R HDG TWO NINER ZERO'. THE PLT RESPONDED 'TWO NINER ZERO, CLRED FOR TKOF.' WITHOUT READING BACK THE DIRECTION OF THE TURN. LCL ASSIGNED A FREQ CHANGE TO DEP FREQ WHEN THE WESTWING WAS STILL ON RWY HDG ABOUT 1 MI S. THE WESTWING CONTINUED ON RWY HDG AND SUBSEQUENTLY, APPROX 3 MI SOUTH BEGAN A L TURN AND CAME VERY CLOSE TO A PREVIOUS IFR DEPARTING PIPER SEMINOLE. WHEN ASKED BY DEP, THE WESTWING PLT CLAIMED TO HAVE BEEN GIVEN A ZERO NINER ZERO HDG. I BELIEVE THE PLT MAY HAVE READ BACK 'TO NINER ZERO' INSTEAD OF 'TWO NINER ZERO'. OBVIOUSLY THESE SOUND THE SAME. TWO ACTIONS COULD HELP TO PREVENT THIS MISUNDERSTANDING. PLTS SHOULD READ BACK NOT ONLY THE HDG BUT THE DIRECTION OF THE TURN AS WELL. CTLRS, IF THEY ARE ASSIGNING TURNS, SHOULD KEEP THE ACFT ON THEIR FREQ UNTIL A TURN IS COMMENCED.
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.