Clearance interpretation problem at sdq first officer when ATC alleges that air carrier B727 had performed an unauthorized heading track position deviation during the departure procedure.

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Attributes
ACN	362133
Time
Date	199702
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sdq
State Reference	FO
Altitude	agl bound lower : 0 agl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sdq tower : sdq tower : dfw
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : takeoff climbout : initial cruise other
Route In Use	departure other departure sid : sid enroute other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	362133
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Inter Facility Coordination Failure Operational Deviation other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Location: sdq airport area. We filed the kodox 2 departure out of sdq to mia. This departure calls for a left turn after takeoff to intercept W4, cdo 351 degree radial. Clearance received from tower was as filed, climb FL310. Then cleared for takeoff. No departure frequency and no further instructions. After takeoff, we noticed 2 aircraft on TCASII that were in our general path of flight. Never visually acquired and we stayed at least 5 mi from the targets. Tower asked us why we had not switched to departure and instructed us to do so. Departure excitedly asked why we had turned left and caused traffic problems. We explained our clearance and departure went silent. Contributing factors are the language and the fact that air carrier had 3 aircraft departing at the same time. A virtual rush hour at this type of operation. Other air carrier Y behind us was given clearance to fly runway heading to 3000 ft. I feel tower thought that clearance was given to us.

Original NASA ASRS Text

Title: CLRNC INTERP PROB AT SDQ FO WHEN ATC ALLEGES THAT ACR B727 HAD PERFORMED AN UNAUTH HDG TRACK POS DEV DURING THE DEP PROC.

Narrative: LOCATION: SDQ ARPT AREA. WE FILED THE KODOX 2 DEP OUT OF SDQ TO MIA. THIS DEP CALLS FOR A L TURN AFTER TKOF TO INTERCEPT W4, CDO 351 DEG RADIAL. CLRNC RECEIVED FROM TWR WAS AS FILED, CLB FL310. THEN CLRED FOR TKOF. NO DEP FREQ AND NO FURTHER INSTRUCTIONS. AFTER TKOF, WE NOTICED 2 ACFT ON TCASII THAT WERE IN OUR GENERAL PATH OF FLT. NEVER VISUALLY ACQUIRED AND WE STAYED AT LEAST 5 MI FROM THE TARGETS. TWR ASKED US WHY WE HAD NOT SWITCHED TO DEP AND INSTRUCTED US TO DO SO. DEP EXCITEDLY ASKED WHY WE HAD TURNED L AND CAUSED TFC PROBS. WE EXPLAINED OUR CLRNC AND DEP WENT SILENT. CONTRIBUTING FACTORS ARE THE LANGUAGE AND THE FACT THAT ACR HAD 3 ACFT DEPARTING AT THE SAME TIME. A VIRTUAL RUSH HR AT THIS TYPE OF OP. OTHER ACR Y BEHIND US WAS GIVEN CLRNC TO FLY RWY HDG TO 3000 FT. I FEEL TWR THOUGHT THAT CLRNC WAS GIVEN TO US.

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.