Corporate flight crew reported responding to two RA's for traffic they had not been advised about wh...

Attributes
ACN	1751985
Time
Date	202007
Local Time Of Day	1201-1800
Place
Locale Reference	P50.TRACON
State Reference	AZ
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Challenger 350
Operating Under FAR Part	Part 135
Flight Phase	Initial Approach
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	Cruise
Route In Use	VFR Route
Flight Plan	VFR
Person 1
Function	Captain Pilot Flying
Person 2
Function	Pilot Not Flying First Officer
Events
Anomaly	Conflict Airborne Conflict

Narrative:

Prior to departure for our flight I briefed the first officer that there is a lot of VFR traffic and flight training in the vicinity of our destination airport. Well in four miles of that airspace lining up for a right base we got two separate ras; one to climb and one to descend. Both times we came within 200 ft. Vertically of the aircraft which we eventually saw. Plus we got one additional TA for a third aircraft. All three other aircraft were not on approach control's frequency. We had just been handed off from approach control to the tower. Busy airspace with a lot of local flight training from students training at an adjacent airport. Suggest air work flight training not be allowed in the airspace between the two airports.

Original NASA ASRS Text

Title: Corporate flight crew reported responding to two RA's for traffic they had not been advised about when switching from Approach to Tower frequency.

Narrative: Prior to departure for our flight I briefed the First Officer that there is a lot of VFR traffic and flight training in the vicinity of our destination airport. Well in four miles of that airspace lining up for a right base we got two separate RAs; one to climb and one to descend. Both times we came within 200 ft. vertically of the aircraft which we eventually saw. Plus we got one additional TA for a third aircraft. All three other aircraft were not on approach control's frequency. We had just been handed off from approach control to the tower. Busy airspace with a lot of local flight training from students training at an adjacent airport. Suggest air work flight training not be allowed in the airspace between the two airports.

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.

Corporate flight crew reported responding to two RA's for traffic they had not been advised about when switching from approach to tower frequency.