An air carrier B737 was given a descent to FL270 near ldn and after leveloff got a TCASII RA which said to descend, which it did. Subsequently they got another TCASII RA to climb and they did that too. When ATC was questioned about traffic the B737 was turned 25 degrees to the right. WX was IMC with light to moderate turbulence and frequency was busy with calls getting stepped on.

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Attributes
ACN	350499
Time
Date	199610
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ldn
State Reference	PA
Altitude	msl bound lower : 26400 msl bound upper : 27400
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zny
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 cruise other descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 6000 flight time type : 600
ASRS Report	350499
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Operational Error Pilot Deviation

Narrative:

2 RA's over ldn en route to allentown, PA. ATC clearance was descend to FL270 ldn 031 degree radial V377 har V162 dummr. While level FL270 we got an RA descent 1500-2000 vvi down. We initiated the descent, passing FL266 clear of traffic. We leveled approximately FL264. While in a climb back to FL270 we received RA climb 1500-2000 vvi. We initiated climb. During climb we were given turn 25 degree right turn by ATC and we initiated the turn. When clear of traffic we returned to FL270. We called ATC. We were descending due to RA and climbing due to RA. Requested if they had traffic on the scope. After a pause they responded yes and gave us a 25 degree right turn. It appears to us ATC was not aware of potential conflict. We received little to no help from ATC. One sequence of our radio calls was stepped on. Flight conditions were IMC light to moderate turbulence and heavy rain.

Original NASA ASRS Text

Title: AN ACR B737 WAS GIVEN A DSCNT TO FL270 NEAR LDN AND AFTER LEVELOFF GOT A TCASII RA WHICH SAID TO DSND, WHICH IT DID. SUBSEQUENTLY THEY GOT ANOTHER TCASII RA TO CLB AND THEY DID THAT TOO. WHEN ATC WAS QUESTIONED ABOUT TFC THE B737 WAS TURNED 25 DEGS TO THE R. WX WAS IMC WITH LIGHT TO MODERATE TURB AND FREQ WAS BUSY WITH CALLS GETTING STEPPED ON.

Narrative: 2 RA'S OVER LDN ENRTE TO ALLENTOWN, PA. ATC CLRNC WAS DSND TO FL270 LDN 031 DEG RADIAL V377 HAR V162 DUMMR. WHILE LEVEL FL270 WE GOT AN RA DSCNT 1500-2000 VVI DOWN. WE INITIATED THE DSCNT, PASSING FL266 CLR OF TFC. WE LEVELED APPROX FL264. WHILE IN A CLB BACK TO FL270 WE RECEIVED RA CLB 1500-2000 VVI. WE INITIATED CLB. DURING CLB WE WERE GIVEN TURN 25 DEG R TURN BY ATC AND WE INITIATED THE TURN. WHEN CLR OF TFC WE RETURNED TO FL270. WE CALLED ATC. WE WERE DSNDING DUE TO RA AND CLBING DUE TO RA. REQUESTED IF THEY HAD TFC ON THE SCOPE. AFTER A PAUSE THEY RESPONDED YES AND GAVE US A 25 DEG R TURN. IT APPEARS TO US ATC WAS NOT AWARE OF POTENTIAL CONFLICT. WE RECEIVED LITTLE TO NO HELP FROM ATC. ONE SEQUENCE OF OUR RADIO CALLS WAS STEPPED ON. FLT CONDITIONS WERE IMC LIGHT TO MODERATE TURB AND HVY RAIN.

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.