Speed restr mistaken for heading change resulted in pilot deviation.

Attributes
ACN	293930
Time
Date	199501
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : dxo
State Reference	MI
Altitude	msl bound lower : 12000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dtw tracon : arpt
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 5000 flight time type : 400
ASRS Report	293930
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 13000
ASRS Report	293925
Events
Anomaly	non adherence : clearance other anomaly other spatial deviation
Independent Detector	other controllera 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:

Previously cleared to turn to heading 210 degrees at witkr. I was flying aircraft on autoplt. We received another clearance which the captain answered and responded, but I only heard his response 210. Apparently my thought was turn to 210 degrees. I turned the aircraft and passing about 240 degrees, controller called and stated that we weren't cleared to heading 210 degrees until witkr. I corrected back to course about the same time controller asked our airspeed about 280 KTS. We were slowing when I thought it was to turn to 210 degrees. The captain did not catch the deviation because he didn't know that he had responded to the controller. Supplemental information from acn 293925: while on spica arrival into dtw we were on the 070 degree radial. We were issued a clearance at 40 DME on the 070 degree radial to turn to a 210 degree heading at 10 DME fix. First officer was flying the aircraft and began a turn to 210 degrees at 26 mi out. As he was turning I reminded him about the 10 mi fix and he initiated a turn back on the 070 degree radial. I caught his heading change too late and failed to properly monitor his flying.

Original NASA ASRS Text

Title: SPD RESTR MISTAKEN FOR HDG CHANGE RESULTED IN PLTDEV.

Narrative: PREVIOUSLY CLRED TO TURN TO HDG 210 DEGS AT WITKR. I WAS FLYING ACFT ON AUTOPLT. WE RECEIVED ANOTHER CLRNC WHICH THE CAPT ANSWERED AND RESPONDED, BUT I ONLY HEARD HIS RESPONSE 210. APPARENTLY MY THOUGHT WAS TURN TO 210 DEGS. I TURNED THE ACFT AND PASSING ABOUT 240 DEGS, CTLR CALLED AND STATED THAT WE WEREN'T CLRED TO HDG 210 DEGS UNTIL WITKR. I CORRECTED BACK TO COURSE ABOUT THE SAME TIME CTLR ASKED OUR AIRSPD ABOUT 280 KTS. WE WERE SLOWING WHEN I THOUGHT IT WAS TO TURN TO 210 DEGS. THE CAPT DID NOT CATCH THE DEV BECAUSE HE DIDN'T KNOW THAT HE HAD RESPONDED TO THE CTLR. SUPPLEMENTAL INFO FROM ACN 293925: WHILE ON SPICA ARR INTO DTW WE WERE ON THE 070 DEG RADIAL. WE WERE ISSUED A CLRNC AT 40 DME ON THE 070 DEG RADIAL TO TURN TO A 210 DEG HDG AT 10 DME FIX. FO WAS FLYING THE ACFT AND BEGAN A TURN TO 210 DEGS AT 26 MI OUT. AS HE WAS TURNING I REMINDED HIM ABOUT THE 10 MI FIX AND HE INITIATED A TURN BACK ON THE 070 DEG RADIAL. I CAUGHT HIS HDG CHANGE TOO LATE AND FAILED TO PROPERLY MONITOR HIS FLYING.

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.