Sct controller issues multiple vector headings for sequencing MD80 behind B737, but MD80 turns into ...

Attributes
ACN	497410
Time
Date	200101
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : san.airport
State Reference	CA
Altitude	msl single value : 31000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : handoff position controller : approach
Qualification	controller : radar
Experience	controller radar : 8 controller time certified in position1 : 6
ASRS Report	497410
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller non radar : 7 controller radar : 3 controller time certified in position1 : 1
ASRS Report	497413
Events
Anomaly	conflict : airborne critical non adherence : clearance other spatial deviation
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	controller : issued new clearance
Miss Distance	horizontal : 1000 vertical : 0
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

MD80 vectored 360 degrees, then 090 degrees, then 070 degrees. Pilot observed in a southeast heading. Climbed for traffic. Pilot acknowledged all assigned headings, but appeared to have turned to an incorrect heading. Supplemental information from acn 497413: aircraft X read back heading 090 degrees, but continued a right turn past 090 degrees into the path of aircraft Y, opposite direction. Pilots never saw each other, had some altitude separation.

Original NASA ASRS Text

Title: SCT CTLR ISSUES MULTIPLE VECTOR HDGS FOR SEQUENCING MD80 BEHIND B737, BUT MD80 TURNS INTO CONFLICT WITH B737.

Narrative: MD80 VECTORED 360 DEGS, THEN 090 DEGS, THEN 070 DEGS. PLT OBSERVED IN A SE HDG. CLBED FOR TFC. PLT ACKNOWLEDGED ALL ASSIGNED HDGS, BUT APPEARED TO HAVE TURNED TO AN INCORRECT HDG. SUPPLEMENTAL INFO FROM ACN 497413: ACFT X READ BACK HDG 090 DEGS, BUT CONTINUED A R TURN PAST 090 DEGS INTO THE PATH OF ACFT Y, OPPOSITE DIRECTION. PLTS NEVER SAW EACH OTHER, HAD SOME ALT SEPARATION.

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.

Sct controller issues multiple vector headings for sequencing MD80 behind B737, but MD80 turns into conflict with B737.