Narrative:

While on vectors to final approach runway 23R we received a vector directly towards a C-172 on the parallel runway 23L while in and out of IMC 10 miles away. There was only 2 aircraft under ATC control at the time. We anticipated the TA and got it within a few seconds. ATC asked us to remain at 210 KTS while 90 degrees intercepting the final approach. We then slowed down to accommodate the impending TA/RA since we were definitely going to overshoot at that angle and speed. We got confused with the next ATC clearance: intercept final at 3;000 ft maintain 210 to 5 miles out. The captain began issuing proactive instructions to avoid the TA/RA. Once the TA began more instructions to slow down and turn to not overshoot and descend on top of the C-172. ATC was asking the impossible to stay at 3;000 ft till 2 miles from the marker for separation; so that instruction didn't compute while our attention was on the TA. We began a descent on the glide slope before receiving an approach clearance. We successfully avoided the C-172; but didn't comply with ATC instructions while maneuvering. Got a phone call from ATC about the incident. The supervisor said; 'the controller gave you no help; and that's in my report.'

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Original NASA ASRS Text

Title: RDU Air Carrier arrival failed to comply with ATC instructions reference the intercept to final due to traffic on a parallel runway; altitude and speed.

Narrative: While on vectors to final approach Runway 23R we received a vector directly towards a C-172 on the parallel Runway 23L while in and out of IMC 10 miles away. There was only 2 aircraft under ATC control at the time. We anticipated the TA and got it within a few seconds. ATC asked us to remain at 210 KTS while 90 degrees intercepting the final approach. We then slowed down to accommodate the impending TA/RA since we were definitely going to overshoot at that angle and speed. We got confused with the next ATC clearance: intercept final at 3;000 FT maintain 210 to 5 miles out. The Captain began issuing proactive instructions to avoid the TA/RA. Once the TA began more instructions to slow down and turn to not overshoot and descend on top of the C-172. ATC was asking the impossible to stay at 3;000 FT till 2 miles from the marker for separation; so that instruction didn't compute while our attention was on the TA. We began a descent on the glide slope before receiving an approach clearance. We successfully avoided the C-172; but didn't comply with ATC instructions while maneuvering. Got a phone call from ATC about the incident. The supervisor said; 'The Controller gave you no help; and that's in my report.'

Data retrieved from NASA's ASRS site as of July 2013 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.