The E4 can not drope the drop tanks, I modify the .air file, any can help me with this problem.

[GUNSTATIONS]
; Nose Guns
gunstation.0=1,45,2,0.067,730,2,0.01,1000,4,40,1d1 *46.3,0,1.5,-2.6,10,0,0,-90,120,65,65,3.697
; Upper Gun
gunstation.1=0,52,1,0.04,730,2,0.04,740,3,40,1d1*3 .1,0,-1.03,-1.22,0,0,180,-180,180,90,0,1.07
; Gunner Lower
gunstation.2=0,56,1,0.04,730,2,0.01,500,1,40,1d1*2 .7,0,-1.22,-4.72,-10,0,180,-65,65,-10,-65,1.07
; Gunner Left Cheek
gunstation.3=0,49,1,0.04,730,2,0.01,500,1,40,1d1*2 .7,-0.91,0.57,-2.94,0,0,-90,-75,75,65,-20,1.07
; Gunner Right Cheek
gunstation.4=0,50,1,0.04,730,2,0.01,500,1,40,1d1*2 .7,0.91,0.57,-2.94,0,0,90,-75,75,65,-20,1.07
;
gunstation.5=3,43,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0
;
gunstation.6=5,20,32,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 ,0,0,0,0
;
gunstation.7=5,20,4,0,0,0,0,0,0,0,1d1*8,0,0,0,0,0, 0,0,0,0,0,0

[guns.0]
gun.0=1000,0.24,-2.35,8.29,0,0,1,1000

[guns.1]
gun.0=750,0,1.75,1.68,0,0,1,750

[guns.2]
gun.0=1000,0,-0.61,5.47,0,0,1,1000

[guns.3]
gun.0=500,-0.17,-0.23,4.92,0,0,1,500

[guns.4]
gun.0=500,0.13,-0.25,4.91,0,0,1,500

[guns.5]
gun.0=32,0,0,0,0,0,0,8

[guns.6]
gun.0=2,0,0,0,0,0,0,0

[guns.7]
gun.0=60,-8.812985,-0.21,0.8,0,0,1,0

[PAYLOAD.8]
; Payload = Long Range
mount.2=wep_gc_sc250, 1, -1
mount.3=wep_gc_sc250, 1, 2
mount.8=wep_gc_sc250, 1, 2
mount.9=wep_gc_sc250, 1, 2
mount.12=wep_DO217weaponrack, 1, -1
mount.21=wep_900l_drop_tank, 1, -1
mount.11=wep_DO217weaponrack, 1, -1
mount.20=wep_900l_drop_tank, 1, -1