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Roughly I counted 46 lakes in Ab that would be of the size for the Mars to be able to scoop from.( they might empty a few of them, but that's the environment ministers problem at that time) Even during the Fort Mac fires they said the Mars could not be used there. Gregoire lake was of sufficient size for them to of been able to use. But they choose instead to not use a asset that would of helped suppress the fire.
Political issues was all that mattered.
When the BC government got access to the Mars for free or deeply discounted they loved the machine. When they had to foot the bill for using it they hated the machine. They hated Mr Coulson and they hated that he was the big boy on the block telling them how to fight fires. He was the biggest and best at the time. Still one of the top in the world to this day.
The arguments of the plane cost to much to fly, it was out dated, fuel was in short supply, it was a one and done drop and all the other excuses are comical at best.
The Mars was updated with the newest Avionics, was or going to be NVG compatible, they installed a select drop system ( you could drop a small bit or water up to the whole load mixed with retardant or not) They were going to convert the plane over to Turbine. Would have increased power, reduced fuel consumption and allowed the plane to fly for many more decades. The politics of the day and today played a very large role in the demise of the Mars. So be it. ( the Bc governments new Aerial contractor crapped the bed so bad one year they Begged Coulson to assist, when he said no they ran a smear campaign. Of note he was deployed elsewhere)
On a plus side Coulson was allowed to finally continue updating and certifying other Aircraft for use in Canada, which previously he was not allowed to. As their company got busier elsewhere he dispersed his assets. The BC government were caught a few times with their pants down as Coulson was deployed fighting fires in other Countries and did not drop what they were doing to save Bc. That caused more political fall out. By then he did not give two craps,(never really did) They were well established elsewhere and did not have to deal with the complaining of a sniveling government who use to get aerial fire fighting for deeply discounted and or free.
The Mars may be seen as a iconic past time of memories, but that plane could still be providing valuable aerial firefighting services across Canada. All the excuses and all the reasons why it cant, are just excuses to not.
I know a few here have talked about the smaller firebosses being able to drop more on a pattern with multiple aircraft. Which in theory is good.
Sometimes you just need a large drop of slurry and or water all at once to hammer the target. With a larger plane you can generally do that. (not with all). But you do not have that option with smaller planes.
Similar to sometimes you need a small drone carrying a 40mm grenade (Fireboss), other times you need a 2000lb Jdam (Mars). Every tool has a purpose and task. One can accomplish a specific task while the other can accomplish all tasks with a larger margin of error.