L.O.G.S.

L.O.G.S. lets any helicopter act as an operational resupply platform: fuel, ammunition and repair. One airframe can carry one role, two, or all three — it only depends on which kits are in the cargo hold.
How it works
Kits are regular inventory items (same idea as jerrycans):
2×2 slots
10 kg
Types: Fuel / Ammo / Repair
Grab them from the arsenal, put them in the hold. As soon as one kit is onboard (even empty), the tanker HUD shows for pilot and copilot.
Fill or empty kits at the helicopter’s fuel point, or from a ground pump / depot in range.

One player can fill one kit at a time. Three kits → three players can fill in parallel.

Filling stops automatically when the combined kit load hits the helicopter’s max cargo weight. The only hard limits are cargo volume and maximum payload.
Kits stay normal items: you can remove them, drop them, or move them to another aircraft.
HUD
LOGI ON / OFF
Only kits currently in the hold are listed, with current amount
Duplicate kits of the same type are added together
Missing kit type = not shown
Default key: Y (rebindable) toggles LOGI ON.

If LOGI is OFF, the helicopter is not a resupply zone.
With the HMSD mod, everyone in the aircraft on the HMSD cable sees the HUD and can toggle logistics mode.
On station
With LOGI ON:
every eligible vehicle in range can take fuel / ammo / repair from the matching kits
multiple vehicles at once just drain the kit faster
the pilot sees live stock on the HUD
no friend/foe check — if you’re in range and LOGI is ON, you get supplied

Fuel kit — hover or landed 

Horizontal range 20 m
Max hover AGL 12 m
Max hover speed 5 km/h

AGL is measured from the helicopter entity origin, not the wheels/skids. On large airframes (Mi-8, Chinook) the origin sits higher — stay clearly under 12 m and almost still.
Ammo & repair — landed only

Same 20 m range, but the helicopter must be on the ground (≤ 1 m AGL and ≤ 1 km/h). No hover resupply for ammo or repair.
Other ranges:
Filling kits from a ground station (pump / depot): 20 m 3D
Player “near the helicopter” for kit actions: 35 m
Supported vehicles: anything that can already take fuel, receive an ammo refill (not crate/shell storage dumps), and be repaired with a wrench.
No extra VFX — HUD plus player comms.
Quick start
Take kit(s) from the arsenal
Load them in the cargo hold
Fill at the heli fuel point or a pump (one player per kit)
Take off
Reach the resupply area
Press Y → LOGI ON
Low hover (fuel) or land (ammo / repair)
Vehicles draw from your kits until empty
Toggle LOGI OFF if needed, return to base, refill
Compatibility
Works with vanilla and modded helicopters that have a cargo hold. Payload and cargo space of the airframe are the only limits. No extra dependencies required. Optional: HMSD for shared HUD / toggle for all crew on the cable.