Corporate jet inbound to vny experienced a TCAS RA with issued VFR traffic both above and below by 5...

Narrative:

Right base for 16R at 2;000 ft. Tower pointed out C172 traffic 12:00; 2 miles at 2;500 ft (in sight). Then; helicopter 2:00 1;500 ft (never in sight). Shortly afterward we received the climb RA; TCAS climb announced to ATC. Moments later we received the stop climb and descend; then maintain vs. Pfds showed red lines above and below with the target box in the middle. ATC advised of dual ras. No comments or apology from tower. TCAS ras were followed and ATC was notified. Suggestions; ATC knew of our arrival (IFR) and should have planned accordingly. Tower should not have attempted to thread us through two opposing aircraft who were 500 ft above and 500 ft below our planned path. ATC had told us they would notify us when to turn base. When after we made the base turn; were received the ras. ATC should have provided more space between us and the other aircraft. ATC could have also held them at a greater distance.

Original NASA ASRS Text

Title: Corporate jet inbound to VNY experienced a TCAS RA with issued VFR traffic both above and below by 500 feet; the reporter suggesting more separation be afforded by ATC is this circumstance.

Narrative: Right base for 16R at 2;000 FT. Tower pointed out C172 traffic 12:00; 2 miles at 2;500 FT (in sight). Then; helicopter 2:00 1;500 FT (never in sight). Shortly afterward we received the Climb RA; TCAS climb announced to ATC. Moments later we received the stop climb and descend; then maintain VS. PFDs showed red lines above and below with the target box in the middle. ATC advised of dual RAs. No comments or apology from tower. TCAS RAs were followed and ATC was notified. Suggestions; ATC knew of our arrival (IFR) and should have planned accordingly. Tower should not have attempted to thread us through two opposing aircraft who were 500 FT above and 500 FT below our planned path. ATC had told us they would notify us when to turn base. When after we made the base turn; were received the RAs. ATC should have provided more space between us and the other aircraft. ATC could have also held them at a greater distance.

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.

Attributes
ACN	1014335
Time
Date	201206
Local Time Of Day	0601-1200
Place
Locale Reference	VNY.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation X (C750)
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Route In Use	Visual Approach
Aircraft 2
Make Model Name	Helicopter
Person 1
Function	Pilot Not Flying Captain
Person 2
Function	Pilot Flying Captain
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict
Miss Distance	Horizontal 500

Corporate jet inbound to vny experienced a TCAS RA with issued VFR traffic both above and below by 500 feet; the reporter suggesting more separation be afforded by ATC is this circumstance.