<< >> NASA ASRS Report 339685, June 1996

An air carrier B747 climbed and turned to avoid an air carrier B737. There was legal separation before the maneuver.

Attributes
ACN	339685
Time
Date	199606
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : smo airport : lax
State Reference	CA
Altitude	msl bound lower : 10000 msl bound upper : 10800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : san
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 3 controller radar : 10
ASRS Report	339685
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : published procedure other anomaly other other spatial deviation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

B747 was descended from 12000 ft to 10000 ft. Traffic was issued on a departure climbing to 9000 ft. The B747 (level at 10000 ft) was looking for the traffic. The departure traffic leveled at 9000 ft. The B747 was observed turning left, away from my airspace, and climbing to 10800 ft. They then advised me that they were responding to a TCASII RA which told them to turn the aircraft left and climb. I confirmed from the pilot that the RA gave him the left turn information and that it was not a pilot decision based on visual sighting. I was not aware of TCASII RA's giving pilots information other than vertical. This left turn took the B747 too close to an adjacent sector without warning. Both aircraft were at assigned altitudes separated by 1000 ft and pointed out to each other.

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Original NASA ASRS Text

Title: AN ACR B747 CLBED AND TURNED TO AVOID AN ACR B737. THERE WAS LEGAL SEPARATION BEFORE THE MANEUVER.

Narrative: B747 WAS DSNDED FROM 12000 FT TO 10000 FT. TFC WAS ISSUED ON A DEP CLBING TO 9000 FT. THE B747 (LEVEL AT 10000 FT) WAS LOOKING FOR THE TFC. THE DEP TFC LEVELED AT 9000 FT. THE B747 WAS OBSERVED TURNING L, AWAY FROM MY AIRSPACE, AND CLBING TO 10800 FT. THEY THEN ADVISED ME THAT THEY WERE RESPONDING TO A TCASII RA WHICH TOLD THEM TO TURN THE ACFT L AND CLB. I CONFIRMED FROM THE PLT THAT THE RA GAVE HIM THE L TURN INFO AND THAT IT WAS NOT A PLT DECISION BASED ON VISUAL SIGHTING. I WAS NOT AWARE OF TCASII RA'S GIVING PLTS INFO OTHER THAN VERT. THIS L TURN TOOK THE B747 TOO CLOSE TO AN ADJACENT SECTOR WITHOUT WARNING. BOTH ACFT WERE AT ASSIGNED ALTS SEPARATED BY 1000 FT AND POINTED OUT TO EACH OTHER.

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.