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Boeing 747-400 Mahan Air
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{Instaliaton}
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open IMG Tool then file/open your gta3.img then press edit/find at400.txd and at400.dff
then delete those files (but remember to make a back-up!!!!)
then press commands/add the files that you can find in the zip file

then got to C:\Program Files\GTA San Andreas\data\carcols.dat and find at400 and replace
it whit this line 

at400 ,1,1  
_____________________________________________________________________________
			+   Ba Tashakor mirmohammad  + 
			 +			    +
			  ++++++++++       +++++++++
				   =       =
				    =     =
				     =   =
				      = =
				       =
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