Date: 201507
Local time of day: 0001-0600
Location: LAX.Tower, CA
Aircraft: B747 Undifferentiated or Other Model
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Flight phase: Takeoff / Launch
ATC / advisory: Tower LAX
Second aircraft: A380
Reporter organization: Government
Reporter function: Local
Reporter qualification: Air Traffic Control Fully Certified
Human factors: Communication Breakdown; Situational Awareness; Training / Qualification
Second reporter function: Local
Anomaly: ATC Issue All Types; Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Air Traffic Control
When detected: Taxi
Result: General None Reported / Taken
Contributing factors: Airport; Human Factors; Procedure
Primary problem: Procedure

Narrative: A380 landed runway 24L and exited at taxiway Z and turned right on twy E westbound for the bridge route. B747; holding in position on rwy 24L. After A380 cleared the runway I gave takeoff clearance to B747. After he departed I was told I couldn't have a design group 6 aircraft on E West of D9 with a design group 6 departure. Not sure who reported it as I was told after it happened. I thought the design group 6 departure rule only applied to A380 aircraft. My local assist should receive no blame as it was my call to launch my departure without knowing the rule - it falls squarely on me.This is my second incident with a B747 in the past month. I know I need to know the rules. That being said; the restriction chart we have is extremely detailed. Also; they aren't at all the positions for ready reference - they need to be at each position. Runway 24R is closed so design group 6 are landing runway 24L which hasn't been a normal procedure so I need to ensure I review the rules each and every day.


Second narrative: At LAX; there are a lot of specific taxiway and runway rules for the Category 6 aircraft; due to the small amount of ground/real estate. One of the new rules; that was recently made; is that there cannot be a Category 6 aircraft on taxiway Echo; West of D9 taxiway; and have a Category 6 aircraft departing runway 24L at the same time. Since runway 24R is closed; aircraft were landing and departing Runway 24L. A Super A380 Airbus; exited the runway early; and the midfield Z exit; and the only way he could taxi due to restrictions; was westbound on E until he reached AA. Meanwhile; a 747 also a category 6 aircraft; was in the slot on Runway 24L about to depart; with an aircraft on final. I turned to the Local Control 2 controller and specifically told him 'I don't think you can depart yet; because the Super Airbus is still on taxiway E'Local Control 2 said 'No; I think that rule is just if it is two super airbusses; not 2 category 6 aircraft.'The rule does apply to any category 6 aircraft; but Local Control 2 didn't listen to me and departed the aircraft anyways before the A380 could get off of taxiway E; as he also had an aircraft on final. I tried my best to warn and avoid this situation; but there was only so much I could do. This never used to be a rule at LAX and everything was fine. I don't think all the Category 6 aircraft rules they keep making at LAX really effect anything; and maybe shouldn't even be a rule. The rule should be re-evaluated; and maybe removed; as it has no real impact on the aircraft; in my opinion.


Synopsis: Takeoff clearance issued to a Group 6 747 with another Group 6 A380 on the parallel taxiway which is contrary to procedure.