<< >> NASA ASRS Report 407774, July 1998

Air carrier B737 flight crew reacts to TCASII RA and takes evasive action due to opposite direction traffic assigned the same altitude. Controller did not provide explanation for incident.

Attributes
ACN	407774
Time
Date	199807
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sjc airport : sfo
State Reference	CA
Altitude	msl bound lower : 7000 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak tower : dca
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	cruise other descent : approach
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 240
ASRS Report	407774
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 2000 vertical : 700
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We had been cleared to 7000 ft by bay approach and at 7800 ft the TCASII alerted us to traffic at 7000 ft. My first officer was flying and I took the controls and stopped the descent at 7700 ft. At the same time I stopped the descent, bay approach told us to maintain 8000 ft. I told approach that we had a visual on the traffic and that we were climbing back up to 8000 ft. The traffic was flying in the opposite direction at 7000 ft approximately 1/4 to 1/2 mi away. The controller did not say anything about the incident.

Related reports:

• Flight crew of an airbus A320 climbed in response to a TCASI...
• A BE90 captain is cleared to fly headings between 270 and 36...
• During a visual approach to an airport with high terrain; a ...
• TRACON controller reported an aircraft was cleared for an RN...
• Medium large transport climbed above altitude that departure...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: ACR B737 FLC REACTS TO TCASII RA AND TAKES EVASIVE ACTION DUE TO OPPOSITE DIRECTION TFC ASSIGNED THE SAME ALT. CTLR DID NOT PROVIDE EXPLANATION FOR INCIDENT.

Narrative: WE HAD BEEN CLRED TO 7000 FT BY BAY APCH AND AT 7800 FT THE TCASII ALERTED US TO TFC AT 7000 FT. MY FO WAS FLYING AND I TOOK THE CTLS AND STOPPED THE DSCNT AT 7700 FT. AT THE SAME TIME I STOPPED THE DSCNT, BAY APCH TOLD US TO MAINTAIN 8000 FT. I TOLD APCH THAT WE HAD A VISUAL ON THE TFC AND THAT WE WERE CLBING BACK UP TO 8000 FT. THE TFC WAS FLYING IN THE OPPOSITE DIRECTION AT 7000 FT APPROX 1/4 TO 1/2 MI AWAY. THE CTLR DID NOT SAY ANYTHING ABOUT THE INCIDENT.

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.