Erj-170 first officer reported an near midair collision with a helicopter on final approach to okc t...

Attributes
ACN	1282572
Time
Date	201507
Local Time Of Day	1201-1800
Place
Locale Reference	OKC.Airport
State Reference	OK
Aircraft 1
Make Model Name	EMB ERJ 170/175 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Landing
Flight Plan	IFR
Aircraft 2
Make Model Name	Helicopter
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Conflict NMAC Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural FAR

Narrative:

On approach to okc; tower asked us to switch to runway 17R for helicopter traffic over the interstate. We complied and were established by 1;000 feet. We saw one helicopter we avoided. Then we got an RA to descend at around 700 feet AGL. We complied. I flew the RA guidance after a momentary hesitation to descend below GS. We never saw the aircraft. The captain saw the traffic on our TCAS [and] it showed 0 feet separation on top of us. The event was in tower's airspace. They did not point out the traffic to us. We also did not hear them give any advisories to the helicopters. The level of safety they provided was unacceptable.tower should have kept the helicopters away from our final approach course and advised us more exactly of their location.

Original NASA ASRS Text

Title: ERJ-170 First Officer reported an NMAC with a helicopter on final approach to OKC that featured an RA command to descend below the glideslope at 700 feet AGL.

Narrative: On approach to OKC; Tower asked us to switch to Runway 17R for helicopter traffic over the interstate. We complied and were established by 1;000 feet. We saw one helicopter we avoided. Then we got an RA to descend at around 700 feet AGL. We complied. I flew the RA guidance after a momentary hesitation to descend below GS. We never saw the aircraft. The Captain saw the traffic on our TCAS [and] it showed 0 feet separation on top of us. The event was in Tower's airspace. They did not point out the traffic to us. We also did not hear them give any advisories to the helicopters. The level of safety they provided was unacceptable.Tower should have kept the helicopters away from our final approach course and advised us more exactly of their location.

Data retrieved from NASA's ASRS site 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.

Erj-170 first officer reported an near midair collision with a helicopter on final approach to okc that featured an RA command to descend below the glideslope at 700 feet AGL.