These problems also occur in other Jets DLC scripts
Changes reasons is same:

1. Function work in local space, in MP say3D command will plays only for pilot and not for other players
2. Need to write parameters in say3D script parameters, see wiki page - if params not written they will drop to default and sound will be not as designed (means pitch and max Distance parameters)
3. new param for say3d 'simulateSpeedOfSound' also will be good tweak

- == BIS_fnc_AircraftTailhook

\a3\functions_f_jets\Functions\Aircraft\fn_aircraftTailhook.sqf
(line 68) need change to if (speed _plane > _arrestMaxAllowedSpeed ) exitWith {EXIT_CODE; [_plane, ["Land_Carrier_01_wire_snap_sound", 1100, 1.3, 0, 0, true]] remoteExec ["say3D"];};
(line 69) need change to [_plane, ["Land_Carrier_01_wire_trap_sound", 1100, 1.3, 0, 0, true]] remoteExec ["say3D"];

- == BIS_fnc_Carrier01AnimateDeflectors

\a3\functions_f_jets\Functions\AircraftCarrier\fn_carrier01AnimateDeflectors.sqf
(line 52) need change to if (_carrierPart animationPhase _x < 0.1) then {[_carrierPart, ["Land_Carrier_01_blast_deflector_up_sound", 150, 1, 0, 0, true]] remoteExec ["say3D"]};
(line 57) need change to if (_carrierPart animationPhase _x > 9.9) then {[_carrierPart, ["Land_Carrier_01_blast_deflector_down_sound", 150, 1, 0, 0, true]] remoteExec ["say3D"]};

And I will repeat what is write in the description of this ticket here so that the necessary changes are more clear

- == BIS_fnc_planeEjectionFX: sound

\a3\functions_f_jets\Functions\Ejection\fn_planeEjectionFX.sqf
(line 53)need change to [_ejectionSeat, [_ejectionSoundExt, 1400, 1, 0, 0, true]] remoteExec ["say3D"];

- == BIS_fnc_planeEjectionFX: visual

Maybe need replace createVehicleLocal with createVehicle (lines 59, 65, 69)?

I think this will help
Have made a repro mission showing the problems of these scripts, download this mission and run it on a dedicated server

After, download this small mod, which makes changes to the game scripts written in my comment above

- == Misc issue found

No MP/SP dependency

When player eject he fly in seat a 350m, in that time he can manually eject from seat to parachute:
Ejection_Seat_Base_F → UserActions → Ejection_Seat_Eject statement = "[this] spawn BIS_fnc_ejectionSeatRelease";
Using that action(function) will insta kill pilot due collision hit Pilot ↔ Ejection Seat

function path
\a3\functions_f_jets\functions\ejection\fn_ejectionseatrelease.sqf
I can suggest a solution using allowDamage:

_pilot spawn
{
	//--- skip if pilot was vulnerable to not broke the scenario
	if (!isDamageAllowed _this) exitWith {moveOut _this};

	_this allowDamage false;
	moveOut _this;
	sleep 2;
	_this allowDamage true;
};

can be used disable(enable)CollisionWith but damage disabling are safer I think, or you know better way…

STEPS TO REPRODUCE

1. fly ejectable plane e.g. Wipeout
2. start fly
3. eject (by x2 V-key or User Action)
4. wait a sec. eject from seat (by x2 V-key or User Action)
5. result → player is dead

he can manually eject from seat to parachute

Should this be possible at all? Can you leave ejection seat in real life in flight?

In T174022#2522941, @BIS_fnc_KK wrote:

Should this be possible at all? Can you leave ejection seat in real life in flight?

I think no, I would hide this action In my opinion, but read this part of function description

• Additional option for player to separate from ejetor seat via user action. default ejection function will ato deploy parachute at 350 m altitude. This is a manual override.
• Result: Pilot will be forced from ejection seat vehicle to parachute. Semi-authenthic behaviour.

If I understand correctly, this is by design =\

In T174022#2522941, @BIS_fnc_KK wrote:

he can manually eject from seat to parachute

Should this be possible at all? Can you leave ejection seat in real life in flight?

In reality, the seat automatically separates from the pilot, within a couple of seconds of ejecting - at the same time as the main chute opens. There is also the ability to manually detach yourself and open the parachute by ripcord if the seat fails to separate. Arma ejection seats are a bit odd in that the automatic separation and chute opening doesn't happen until 350m altitude, I guess to reduce the amount of time spent slowly descending on the chute.

If the timing of the automatic system won't be changed, I think it's reasonable to allow pilots to open the chute earlier if they want to.

Speed of sound simulation is a good tweak for long-hearable range sounds
Will be great if the speed of sound will be used when scripting issues from this ticket get fixed

I think setPhysicsCollisionFlag would be a great solution to issue № 9

vanilla (pilot killed)	changed (pilot survived)