A pc-12 pilot reported that while on downwind ATC released another pc-12 for takeoff from a crossing...

Narrative:

As we were joining an extended left downwind for runway 16 at 1;900 feet; a pc-12 contacted tower for departure as they were holding short of runway 11. Tower instructed the pc-12 to hold short for crossing downwind traffic for runway 16. The pc-12 held short. As other traffic landed on runway 16 tower instructed the pc-12 to line up and wait on runway 11; and to hold short for downwind traffic. After a few moments he then cleared the pc-12 for takeoff; afterwards telling us to watch out for the departing traffic off runway 11. The timing was perfect for a collision as the pc-12 took off with no relative motion; climbing to directly intercept our flight path. After the TCAS announced 'traffic!' we were forced to adjust our downwind leg; with a climbing left turn to avoid a collision with the departing pc-12.tower could have waited for us to cross the departure end of runway 11 before clearing the other pc-12 for takeoff.

Original NASA ASRS Text

Title: A PC-12 pilot reported that while on downwind ATC released another PC-12 for takeoff from a crossing way; resulting in an airborne conflict that required evasive action.

Narrative: As we were joining an extended left downwind for Runway 16 at 1;900 feet; a PC-12 contacted Tower for departure as they were holding short of Runway 11. Tower instructed the PC-12 to hold short for crossing downwind traffic for Runway 16. The PC-12 held short. As other traffic landed on Runway 16 Tower instructed the PC-12 to line up and wait on Runway 11; and to hold short for downwind traffic. After a few moments he then cleared the PC-12 for takeoff; afterwards telling us to watch out for the departing traffic off Runway 11. The timing was perfect for a collision as the PC-12 took off with no relative motion; climbing to directly intercept our flight path. After the TCAS announced 'TRAFFIC!' we were forced to adjust our downwind leg; with a climbing left turn to avoid a collision with the departing PC-12.Tower could have waited for us to cross the departure end of Runway 11 before clearing the other PC-12 for takeoff.

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	1348469
Time
Date	201604
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PC-12
Operating Under FAR Part	Part 91
Flight Phase	Landing
Flight Plan	IFR
Aircraft 2
Make Model Name	PC-12
Operating Under FAR Part	Part 135
Flight Phase	Climb
Flight Plan	IFR
Person 1
Function	Pilot Flying
Events
Anomaly	ATC Issue All Types Conflict NMAC

A pc-12 pilot reported that while on downwind ATC released another pc-12 for takeoff from a crossing way; resulting in an airborne conflict that required evasive action.