Lax tower controllers reported a loss of wake turbulence separation do to aircraft speed.

Attributes
ACN	1632324
Time
Date	201904
Local Time Of Day	1801-2400
Place
Locale Reference	LAX.Tower
State Reference	CA
Aircraft 1
Make Model Name	A380
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Aircraft 2
Make Model Name	Regional Jet 200 ER/LR (CRJ200)
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Person 1
Function	Handoff / Assist Local
Qualification	Air Traffic Control Fully Certified
Person 2
Function	Trainee Local
Qualification	Air Traffic Control Developmental
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Clearance Deviation - Speed All Types

Narrative:

I was working assist 2 when training was occurring on local control 2. Aircraft X took off and was climbing slow. The instructor told the trainee when to say clear for takeoff to aircraft Y. Aircraft X stayed slow for a while and aircraft Y was gaining on aircraft X. The trainee told aircraft Y to maintain 023 feet; but the pilot couldn't stop at that altitude so he was told to maintain 030 feet. Aircraft X was off the scope but I was told they had around 6.5 miles instead of the 7 miles needed. If I was working; I would have waited another 20 seconds before departing aircraft Y.

Original NASA ASRS Text

Title: LAX Tower controllers reported a loss of wake turbulence separation do to aircraft speed.

Narrative: I was working Assist 2 when training was occurring on Local Control 2. Aircraft X took off and was climbing slow. The Instructor told the Trainee when to say clear for takeoff to Aircraft Y. Aircraft X stayed slow for a while and Aircraft Y was gaining on Aircraft X. The Trainee told Aircraft Y to maintain 023 feet; but the pilot couldn't stop at that altitude so he was told to maintain 030 feet. Aircraft X was off the scope but I was told they had around 6.5 miles instead of the 7 miles needed. If I was working; I would have waited another 20 seconds before departing Aircraft Y.

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.