Speed deviation on approach procedure.

Attributes
ACN	201270
Time
Date	199202
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time total : 8000
ASRS Report	201270
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure non adherence : clearance other anomaly
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Chicago approach told us to reduce to 170 KTS to the marker (OM) 22R. 3 mi from marker (OM) we were gaining on air carrier medium large transport ahead. TCASII showed him inside 3 mi and closing. First officer reduced to 140 KTS which was other air carrier's medium large transport approach speed. Chicago approach asked what our approach speed was and we replied 140 KTS. The controller angrily said pick up speed to 170 KTS that was your instructed speed. TCASII showed 3 mi spacing ahead and no aircraft behind us. The reason for the speed reduction was the aircraft less than 3 mi ahead and distance was closing. There was a question of 'safety' in the captain's judgement.

Original NASA ASRS Text

Title: SPD DEV ON APCH PROC.

Narrative: CHICAGO APCH TOLD US TO REDUCE TO 170 KTS TO THE MARKER (OM) 22R. 3 MI FROM MARKER (OM) WE WERE GAINING ON ACR MLG AHEAD. TCASII SHOWED HIM INSIDE 3 MI AND CLOSING. FO REDUCED TO 140 KTS WHICH WAS OTHER ACR'S MLG APCH SPD. CHICAGO APCH ASKED WHAT OUR APCH SPD WAS AND WE REPLIED 140 KTS. THE CTLR ANGRILY SAID PICK UP SPD TO 170 KTS THAT WAS YOUR INSTRUCTED SPD. TCASII SHOWED 3 MI SPACING AHEAD AND NO ACFT BEHIND US. THE REASON FOR THE SPD REDUCTION WAS THE ACFT LESS THAN 3 MI AHEAD AND DISTANCE WAS CLOSING. THERE WAS A QUESTION OF 'SAFETY' IN THE CAPT'S JUDGEMENT.

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.