<< >> NASA ASRS Report 426960, January 1999

B727 crew in cruise at FL280 were given descent to FL260 by ZOB controller. During descent, B727 crew received a TCASII TA RA on traffic at FL270 and spotted a B737 on a converging course.

Attributes
ACN	426960
Time
Date	199901
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : roc
State Reference	NY
Altitude	msl bound lower : 27600 msl bound upper : 28000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 19000 flight time type : 11000
ASRS Report	426960
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer
Experience	flight time last 90 days : 40 flight time total : 3200 flight time type : 40
ASRS Report	426851
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 600
Supplementary
Air Traffic Incident	Operational Error

Narrative:

We were level at FL280 and ZOB gave us a descent to FL260. We began the descent. I saw a target on the TCASII heading in our direction at FL270 at about 15 NM. I questioned ATC. We were given a 40 degree turn to the right for traffic. We also got a TA which was rapidly followed by an RA. We responded to the RA and informed ATC. We had good visual contact with the B737 (after the RA) and our lowest altitude was about FL276. After we were once again level at FL280, I asked ATC if they had really given us a clearance to FL260. They said 'yes they did!' the TCASII worked as advertised.

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Original NASA ASRS Text

Title: B727 CREW IN CRUISE AT FL280 WERE GIVEN DSCNT TO FL260 BY ZOB CTLR. DURING DSCNT, B727 CREW RECEIVED A TCASII TA RA ON TFC AT FL270 AND SPOTTED A B737 ON A CONVERGING COURSE.

Narrative: WE WERE LEVEL AT FL280 AND ZOB GAVE US A DSCNT TO FL260. WE BEGAN THE DSCNT. I SAW A TARGET ON THE TCASII HDG IN OUR DIRECTION AT FL270 AT ABOUT 15 NM. I QUESTIONED ATC. WE WERE GIVEN A 40 DEG TURN TO THE R FOR TFC. WE ALSO GOT A TA WHICH WAS RAPIDLY FOLLOWED BY AN RA. WE RESPONDED TO THE RA AND INFORMED ATC. WE HAD GOOD VISUAL CONTACT WITH THE B737 (AFTER THE RA) AND OUR LOWEST ALT WAS ABOUT FL276. AFTER WE WERE ONCE AGAIN LEVEL AT FL280, I ASKED ATC IF THEY HAD REALLY GIVEN US A CLRNC TO FL260. THEY SAID 'YES THEY DID!' THE TCASII WORKED AS ADVERTISED.

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.