<< >> NASA ASRS Report 245854, July 1993

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.

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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.