An emb-175 captain on descent into las reported a conflict with another emb-175 who was departing la...

Narrative:

We were cleared to descend to 11;000 feet on the las SUNST3 arrival. During the descent; we received a traffic warning and RA as another aircraft was given an unrestricted climb to FL190 on the las SHEAD8 departure; which deviated from the published speeds and altitudes. We were descending through 2;500 feet when we got the alert. The traffic was close enough for me to identify that it was another EMB175. The first officer took evasive action and followed flight director guidance and adjusted vertical speed to avoid collision. This was a result of ATC issuing a clearance that deviated from published altitudes and speeds; which in turn caused the RA. Had the departure been flown as published we would have crossed with 2000 feet clearance of the other aircraft. Instead; we were descending at 1500fpm as another aircraft with an unrestricted climb; was climbing at approximately 3000fpm giving a 4500fpm closure rate; which caused the RA. The RA was reported to ATC. We landed without incident.

Original NASA ASRS Text

Title: An EMB-175 Captain on descent into LAS reported a conflict with another EMB-175 who was departing LAS. The reporter stated he believed the ATC clearance precipitated the event.

Narrative: We were cleared to descend to 11;000 feet on the LAS SUNST3 arrival. During the descent; we received a traffic warning and RA as another aircraft was given an unrestricted climb to FL190 on the LAS SHEAD8 departure; which deviated from the published speeds and altitudes. We were descending through 2;500 feet when we got the alert. The traffic was close enough for me to identify that it was another EMB175. The First Officer took evasive action and followed flight director guidance and adjusted vertical speed to avoid collision. This was a result of ATC issuing a clearance that deviated from published altitudes and speeds; which in turn caused the RA. Had the departure been flown as published we would have crossed with 2000 feet clearance of the other aircraft. Instead; we were descending at 1500fpm as another aircraft with an unrestricted climb; was climbing at approximately 3000fpm giving a 4500fpm closure rate; which caused the RA. The RA was reported to ATC. We landed without incident.

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.

Attributes
ACN	1257973
Time
Date	201504
Local Time Of Day	0601-1200
Place
Locale Reference	LAS.Airport
State Reference	NV
Aircraft 1
Make Model Name	EMB ERJ 170/175 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR SUNST3
Flight Plan	IFR
Aircraft 2
Make Model Name	EMB ERJ 170/175 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Climb
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy

An emb-175 captain on descent into las reported a conflict with another emb-175 who was departing las. The reporter stated he believed the ATC clearance precipitated the event.