 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Multiple clearance changes and reported non standard terminology result in misinterp of clearance and an altitude deviation.
| Attributes | |
| ACN | 479280 |
| Time | |
| Date | 200007 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : dtw.airport |
| State Reference | MI |
| Altitude | msl bound lower : 13000 msl bound upper : 19000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 16000 flight time type : 2000 |
| ASRS Report | 479280 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | non adherence : clearance other anomaly other |
| Independent Detector | other controllerb |
| Resolutory Action | controller : issued new clearance controller : issued advisory |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Departed dtw on jul/WX/00 for pdx on flight XXX. Departure clearance was to turn to 235 degrees, maintain 10000 ft. After takeoff, contacted departure. Immediately had a turn to the north. Turn to 310 degrees, climb and maintain 13000 ft, maintain 250 KIAS. Turn right heading 345 degrees, maintain 270 KIAS. Turn right heading 010 degrees. After about 2 mins on this heading, we received a clearance, 'air carrier X, turn left heading 270 degrees, maintain 270 (oh) cleared direct dunks.' the first officer read back, 'heading 270 degrees, maintain FL270, direct dunks.' I (captain/PF) turned aircraft left, and put 270 in climb mode. Passing through 19000 ft, and climbing to FL270, departure cleared us to another frequency. They asked who cleared us above 13000 ft, and the first officer said 'the last frequency.' a lot of '270' going on, turn left 270, maintain 270, etc. Thinking back, I believe both the controller and first officer used nonstandard terminology, which enhanced the 'probable problem.'
Original NASA ASRS Text
Title: MULTIPLE CLRNC CHANGES AND RPTED NON STANDARD TERMINOLOGY RESULT IN MISINTERP OF CLRNC AND AN ALTDEV.
Narrative: DEPARTED DTW ON JUL/WX/00 FOR PDX ON FLT XXX. DEP CLRNC WAS TO TURN TO 235 DEGS, MAINTAIN 10000 FT. AFTER TKOF, CONTACTED DEP. IMMEDIATELY HAD A TURN TO THE N. TURN TO 310 DEGS, CLB AND MAINTAIN 13000 FT, MAINTAIN 250 KIAS. TURN R HDG 345 DEGS, MAINTAIN 270 KIAS. TURN R HDG 010 DEGS. AFTER ABOUT 2 MINS ON THIS HDG, WE RECEIVED A CLRNC, 'ACR X, TURN L HDG 270 DEGS, MAINTAIN 270 (OH) CLRED DIRECT DUNKS.' THE FO READ BACK, 'HDG 270 DEGS, MAINTAIN FL270, DIRECT DUNKS.' I (CAPT/PF) TURNED ACFT L, AND PUT 270 IN CLB MODE. PASSING THROUGH 19000 FT, AND CLBING TO FL270, DEP CLRED US TO ANOTHER FREQ. THEY ASKED WHO CLRED US ABOVE 13000 FT, AND THE FO SAID 'THE LAST FREQ.' A LOT OF '270' GOING ON, TURN L 270, MAINTAIN 270, ETC. THINKING BACK, I BELIEVE BOTH THE CTLR AND FO USED NONSTANDARD TERMINOLOGY, WHICH ENHANCED THE 'PROBABLE PROB.'
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.