<< >> NASA ASRS Report 341819, July 1996

These E120 pilot rptrs experienced confusion over the controller's query about their assigned heading. The approach controller assigned a new heading clearance as a result of traffic within 5 NM of this flight crew's aircraft. No other explanation was offered.

Attributes
ACN	341819
Time
Date	199607
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : oak
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 135
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 3000 flight time type : 250
ASRS Report	341819
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 9500 flight time type : 1800
ASRS Report	341580
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Controller told us to turn to heading 070 degrees and contact bay. A few seconds later, when checking on with bay, he told us to turn to 170 degrees, you have traffic at 11 O'clock and 5 mi. Told us to tighten up the turn and we complied. He asked which type of aircraft we were and said that there must have been some confusion on the heading. The crew heard specifically 070 degrees. No other request from ATC or follow-up.

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Original NASA ASRS Text

Title: THESE E120 PLT RPTRS EXPERIENCED CONFUSION OVER THE CTLR'S QUERY ABOUT THEIR ASSIGNED HDG. THE APCH CTLR ASSIGNED A NEW HDG CLRNC AS A RESULT OF TFC WITHIN 5 NM OF THIS FLC'S ACFT. NO OTHER EXPLANATION WAS OFFERED.

Narrative: CTLR TOLD US TO TURN TO HDG 070 DEGS AND CONTACT BAY. A FEW SECONDS LATER, WHEN CHKING ON WITH BAY, HE TOLD US TO TURN TO 170 DEGS, YOU HAVE TFC AT 11 O'CLOCK AND 5 MI. TOLD US TO TIGHTEN UP THE TURN AND WE COMPLIED. HE ASKED WHICH TYPE OF ACFT WE WERE AND SAID THAT THERE MUST HAVE BEEN SOME CONFUSION ON THE HDG. THE CREW HEARD SPECIFICALLY 070 DEGS. NO OTHER REQUEST FROM ATC OR FOLLOW-UP.

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.