Flight crew of a gulfstream G4 failed to turn to the vector heading assigned by ATC during climb on departure resulting in ATC intervention to bring them back to correct heading. The first officer did not catch the captain's mistake in turning to the wrong heading.

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Attributes
ACN	391680
Time
Date	199801
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ttn airport : phl
State Reference	NJ
Altitude	msl bound lower : 7000 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Gulfstream IV
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other enroute : on vectors enroute airway : phl
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 45 flight time total : 7000 flight time type : 3000
ASRS Report	391680
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	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:

Understood heading assignment 145 degrees. Captain selected 145 degrees. ATC came back 2-3 mins later, with a reassignment of heading and asked what happened to the 045 degree heading. Not aware of conflict with any other aircraft. The first officer had understood heading assignment to be 045 degrees, but didn't catch the captain's mistake. Captain understood 145 degrees to be the assigned heading. We normally make both crew members confirm any altitude assignment. We plan to normally restate the heading also from now on.

Original NASA ASRS Text

Title: FLC OF A GULFSTREAM G4 FAILED TO TURN TO THE VECTOR HEADING ASSIGNED BY ATC DURING CLB ON DEP RESULTING IN ATC INTERVENTION TO BRING THEM BACK TO CORRECT HEADING. THE FO DID NOT CATCH THE CAPT'S MISTAKE IN TURNING TO THE WRONG HEADING.

Narrative: UNDERSTOOD HEADING ASSIGNMENT 145 DEGS. CAPT SELECTED 145 DEGS. ATC CAME BACK 2-3 MINS LATER, WITH A REASSIGNMENT OF HEADING AND ASKED WHAT HAPPENED TO THE 045 DEG HDG. NOT AWARE OF CONFLICT WITH ANY OTHER ACFT. THE FO HAD UNDERSTOOD HEADING ASSIGNMENT TO BE 045 DEGS, BUT DIDN'T CATCH THE CAPT'S MISTAKE. CAPT UNDERSTOOD 145 DEGS TO BE THE ASSIGNED HEADING. WE NORMALLY MAKE BOTH CREW MEMBERS CONFIRM ANY ALT ASSIGNMENT. WE PLAN TO NORMALLY RESTATE THE HEADING ALSO FROM NOW ON.

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.