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Air carrier on polar STAR into dtw. First officer, PF, misunderstood clearance to maintain 310 KIAS on descent. Controller queried airspeed and cleared the flight to continue descent to FL220 and increase airspeed to FL310. No conflict resulted from deviation.
| Attributes | |
| ACN | 347510 |
| Time | |
| Date | 199609 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mkg |
| State Reference | MI |
| Altitude | msl bound lower : 22000 msl bound upper : 27000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 16000 flight time type : 1500 |
| ASRS Report | 347510 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 150 flight time total : 8000 flight time type : 600 |
| ASRS Report | 347516 |
| Events | |
| Anomaly | non adherence : clearance other anomaly |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Multiple vectors and speed changes throughout flight, sequencing into dtw. Descent from FL270 to FL230. Some misunderstanding occurred about airspeed assignment. ATC inquired about airspeed (250-260 KTS). ATC requested a descent from FL230 to FL220 and increase airspeed to 310 KTS. ATC never commented on airspeed after that. Apparently no conflict occurred. Supplemental information from acn 347516: the captain (PNF) reminded the first officer (PF) that the speed should have been 310 KTS or more. The first officer had misunderstood the correct speed and thought it to be 220 KTS when clearance was given.
Original NASA ASRS Text
Title: ACR ON POLAR STAR INTO DTW. FO, PF, MISUNDERSTOOD CLRNC TO MAINTAIN 310 KIAS ON DSCNT. CTLR QUERIED AIRSPD AND CLRED THE FLT TO CONTINUE DSCNT TO FL220 AND INCREASE AIRSPD TO FL310. NO CONFLICT RESULTED FROM DEV.
Narrative: MULTIPLE VECTORS AND SPD CHANGES THROUGHOUT FLT, SEQUENCING INTO DTW. DSCNT FROM FL270 TO FL230. SOME MISUNDERSTANDING OCCURRED ABOUT AIRSPD ASSIGNMENT. ATC INQUIRED ABOUT AIRSPD (250-260 KTS). ATC REQUESTED A DSCNT FROM FL230 TO FL220 AND INCREASE AIRSPD TO 310 KTS. ATC NEVER COMMENTED ON AIRSPD AFTER THAT. APPARENTLY NO CONFLICT OCCURRED. SUPPLEMENTAL INFO FROM ACN 347516: THE CAPT (PNF) REMINDED THE FO (PF) THAT THE SPD SHOULD HAVE BEEN 310 KTS OR MORE. THE FO HAD MISUNDERSTOOD THE CORRECT SPD AND THOUGHT IT TO BE 220 KTS WHEN CLRNC WAS GIVEN.
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.