Here you go.
; tail-rotor fail script by Vektorboson
; SYNTAX
; [CHOPPER, <RANDOMKILLS, MAXKILLS>] exec "effects\tailrotor.sqs"
; CHOPPER is the helicopter
; RANDOMKILLS is either true or false (random people are killed)
; MAXKILLS is maximum of randomkills
_heli = _this select 0
_random = true
_maxkills = 4
?count _this == 2: _random = _this select 1; _maxkills = 4
?count _this == 3: _random = _this select 1; _maxkills = _this select 2
; Position of helicopter engine (adjust this for different helicopters!)
_enginePos = [0, -3, 1]
drop ["cl_fire", "", "Billboard", 1, 1, _enginePos, [0,-3,1], 0, 1, 1, 0.001, [1,5], [[1,1,1,1],[1,1,1,0]], [0], 0.1, 0.2, "", "", _heli]
~0.05
drop ["cl_fire", "", "Billboard", 1, 1, _enginePos, [0,-3,1], 0, 1, 1, 0.001, [1,5], [[1,1,1,1],[1,1,1,0]], [0], 0.1, 0.2, "", "", _heli]
~0.02
drop ["cl_fire", "", "Billboard", 1, 1, _enginePos, [0,-3,1], 0, 1, 1, 0.001, [1,5], [[1,1,1,1],[1,1,1,0]], [0], 0.1, 0.2, "", "", _heli]
_AddDir = 0.1
~(random 1)
#loop
_dir = getDir _heli
?_AddDir < 5: _AddDir = _AddDir + 0.05
_heli setDir (_dir + _AddDir)
_v = Velocity _heli
_heli setVelocity [((_v select 0) / 1.001), ((_v select 1) / 1.001), -5]
drop ["cl_basic", "", "Billboard", 7, 7, _enginePos, [0,0,0], 0, 1, 1, 0.001, [1,5], [[0,0,0,0],[0,0,0,0.7],[0,0,0,0]], [0], 0.1, 0.2, "", "", _heli]
~0.01
?getPos _heli select 2 > 2: goto "loop"
?alive _heli: _heli setDammage 0.8; _heli setFuel 0
?!alive _heli: exit
?!_random: exit
; now the randomkills
_crew = crew _heli
_c = count _crew
_i = 0
_kills = 0
#crew
_unit = _crew select _i
?random 1 > 0.8 && _unit != player: _unit setdammage (random 1)
?random 1 > 0.8 && _unit != player && _kills < _maxkills: _unit setdammage 1; _kills = _kills + 1
_i = _i + 1
?_i < _c: goto "crew"