<< >> NASA ASRS Report 393683, February 1998

A B727 flight crew initiated TCASII evasive climb action caused by a crossing B737 at the same altitude while in dtw approach control airspace. Controller issued a traffic conflict advisory. B727 landed without further incident.

Attributes
ACN	393683
Time
Date	199802
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dtw
State Reference	MI
Altitude	msl bound lower : 12000 msl bound upper : 13000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dtw
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other descent : approach
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
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	393683
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 15000 vertical : 350
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

While on a vector from detroit approach control at an altitude of 12000 ft for landing on runway 3L at dtw, we received a TA warning on TCASII. The target was just outside the 10 NM arc. When the target moved outside the 10 NM arc, a TCASII RA warning was received and a climb was initiated. Immediately, approach control issued a traffic conflict advisory. I informed them that we were already climbing to avoid the traffic. The other aircraft appeared to be a B737 and passed 300- 400 ft below us. We had to climb over 1000 ft to avoid the traffic. Approach control then issued a clearance to 11000 ft when clear of traffic. Approach and landing was made at dtw on runway 3L without further incident.

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Original NASA ASRS Text

Title: A B727 FLC INITIATED TCASII EVASIVE CLB ACTION CAUSED BY A XING B737 AT THE SAME ALT WHILE IN DTW APCH CTL AIRSPACE. CTLR ISSUED A TFC CONFLICT ADVISORY. B727 LANDED WITHOUT FURTHER INCIDENT.

Narrative: WHILE ON A VECTOR FROM DETROIT APCH CTL AT AN ALT OF 12000 FT FOR LNDG ON RWY 3L AT DTW, WE RECEIVED A TA WARNING ON TCASII. THE TARGET WAS JUST OUTSIDE THE 10 NM ARC. WHEN THE TARGET MOVED OUTSIDE THE 10 NM ARC, A TCASII RA WARNING WAS RECEIVED AND A CLB WAS INITIATED. IMMEDIATELY, APCH CTL ISSUED A TFC CONFLICT ADVISORY. I INFORMED THEM THAT WE WERE ALREADY CLBING TO AVOID THE TFC. THE OTHER ACFT APPEARED TO BE A B737 AND PASSED 300- 400 FT BELOW US. WE HAD TO CLB OVER 1000 FT TO AVOID THE TFC. APCH CTL THEN ISSUED A CLRNC TO 11000 FT WHEN CLR OF TFC. APCH AND LNDG WAS MADE AT DTW ON RWY 3L WITHOUT FURTHER 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.