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A TRACON dc used nonstandard phraseology causing an air carrier medium large transport to exceed a desired speed.
| Attributes | |
| ACN | 245854 |
| Time | |
| Date | 199307 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : dxo airport : dtw |
| State Reference | MI |
| Altitude | msl bound lower : 11000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dtw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| 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 : 150 flight time total : 3500 flight time type : 500 |
| ASRS Report | 245854 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other anomaly other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
Departed dtw runway 3C. Given right turn out. Above 10000 ft, we asked to deviate right around WX. Present heading was approximately 180 degrees. Controller said that was approved 'no more than 250.' we interpreted that to mean no further right than 250 degree heading for deviation. Our response was 'no problem, we'll fly about 210 degree heading.' we continued accelerating to 310 IAS for climb. 2 mins later, controller said 'say airspeed.' we said '310 IAS.' he said 'I restr you to 250.' then we explained the confusion to the controller and he apologized. When controllers issue speed restrictions, they must add 'IAS,' 'speed,' 'KTS.' also, they must listen for readbacks. The readback we gave should have given him a clue we had misunderstood him.
Original NASA ASRS Text
Title: A TRACON DC USED NONSTANDARD PHRASEOLOGY CAUSING AN ACR MLG TO EXCEED A DESIRED SPD.
Narrative: DEPARTED DTW RWY 3C. GIVEN R TURN OUT. ABOVE 10000 FT, WE ASKED TO DEVIATE R AROUND WX. PRESENT HDG WAS APPROX 180 DEGS. CTLR SAID THAT WAS APPROVED 'NO MORE THAN 250.' WE INTERPRETED THAT TO MEAN NO FURTHER RIGHT THAN 250 DEG HDG FOR DEV. OUR RESPONSE WAS 'NO PROB, WE'LL FLY ABOUT 210 DEG HDG.' WE CONTINUED ACCELERATING TO 310 IAS FOR CLB. 2 MINS LATER, CTLR SAID 'SAY AIRSPD.' WE SAID '310 IAS.' HE SAID 'I RESTR YOU TO 250.' THEN WE EXPLAINED THE CONFUSION TO THE CTLR AND HE APOLOGIZED. WHEN CTLRS ISSUE SPD RESTRICTIONS, THEY MUST ADD 'IAS,' 'SPD,' 'KTS.' ALSO, THEY MUST LISTEN FOR READBACKS. THE READBACK WE GAVE SHOULD HAVE GIVEN HIM A CLUE WE HAD MISUNDERSTOOD HIM.
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.