Las tower controller reports on the use of visual separation during a training session; with the sec...

Narrative:

Aircraft X on a STAAV6 departure; had departed runway 25R. The departure essentially flies out then makes an arcing right turn to an approximately 030 heading. (There are RNAV points on the departure plate that plot the exact route of flight.) aircraft Y [a turboprop] was cleared for takeoff behind aircraft X and ordered to maintain visual separation with aircraft X. Aircraft Y complied with the instruction and turned to the assigned heading 290 off of runway 25R. By this time; aircraft X is talking to departure and aircraft Y has been switched to departure. The 290 heading pointed aircraft Y right at aircraft X that was in it's right. The departure controller turned aircraft Y farther right than the 290 heading to avert aircraft X. This all occurred approximately 9 [miles] northwest of the airport.at the time; training was being conducted in local 1. The on the job training instructing (ojti) didn't think it was the best practice to apply visual separation with aircraft Y because of it's extreme performance as a turbo-prop. The ojti allowed it for training purposes so the developmental can understand how aircraft Y performs. In the future; the developmental knows to give a bit more 'room' for this turbo-prop versus jet powered aircraft. Anytime separation and/or safety may be compromised; the training should be scaled back instead of allowing the developmental to make a possible error.

Original NASA ASRS Text

Title: LAS Tower Controller reports on the use of visual separation during a training session; with the second aircraft performing better than the trainee expected. TRACON Controller turned aircraft further to avoid more separation issues.

Narrative: Aircraft X on a STAAV6 departure; had departed runway 25R. The departure essentially flies out then makes an arcing right turn to an approximately 030 heading. (There are RNAV points on the departure plate that plot the exact route of flight.) Aircraft Y [a turboprop] was cleared for takeoff behind Aircraft X and ordered to maintain visual separation with Aircraft X. Aircraft Y complied with the instruction and turned to the assigned heading 290 off of Runway 25R. By this time; Aircraft X is talking to departure and Aircraft Y has been switched to departure. The 290 heading pointed Aircraft Y right at Aircraft X that was in it's right. The departure controller turned Aircraft Y farther right than the 290 heading to avert Aircraft X. This all occurred approximately 9 [miles] northwest of the airport.At the time; training was being conducted in Local 1. The On the Job Training Instructing (OJTI) didn't think it was the best practice to apply visual separation with Aircraft Y because of it's extreme performance as a Turbo-prop. The OJTI allowed it for training purposes so the developmental can understand how Aircraft Y performs. In the future; the developmental knows to give a bit more 'room' for this turbo-prop versus jet powered aircraft. Anytime separation and/or safety may be compromised; the training should be scaled back instead of allowing the developmental to make a possible error.

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	1269800
Time
Date	201505
Local Time Of Day	1801-2400
Place
Locale Reference	LAS.Airport
State Reference	NV
Environment
Light	Daylight
Aircraft 1
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	SID STAAV6
Flight Plan	IFR
Aircraft 2
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Other / Unknown
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 2
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types

Las tower controller reports on the use of visual separation during a training session; with the second aircraft performing better than the trainee expected. TRACON controller turned aircraft further to avoid more separation issues.