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Each helicopter has 6 independent damage zones. Each zone can be individually enabled or disabled per helicopter via its JSON config file. Setting all zones to 0 makes that helicopter completely invincible.

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The 6 Zones

Zone SettingWhat it coversEffect when destroyed
CZH_dmgZoneBodyFuselage / airframeReduced structural integrity
CZH_dmgZoneEngineEngineEngine failure, forced autorotation
CZH_dmgZoneChassisLanding gear / skidsLoss of stable ground contact
CZH_dmgZoneFuelFuel tankIncreased fuel leak rate
CZH_dmgZoneRotor1Main rotorHelicopter falls — immediate crash
CZH_dmgZoneRotor2Tail rotorUncontrolled yaw spin

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Defaults

HelicopterChassisBodyEngineFuelMain RotorTail Rotor
MD500, MH-6, SA342M, UH-1H011111
MH-60L Blackhawk111111
AW101 Merlin111111
Skid-equipped helicopters have chassis damage disabled by default. Wheeled helicopters (Blackhawk, Merlin) have it enabled.

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Rotor Damage

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Main Rotor Destroyed

The helicopter immediately loses lift and falls. There is no recovery.

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Tail Rotor Destroyed

The helicopter enters an uncontrolled yaw spin. Spin rate is set by CZH_tailRotorSpinRate and a forced descent is applied at CZH_tailRotorDescentRate.
HelicopterTail Rotor Spin Rate
MD500 Civilian125 deg/s
MH-6 Little Bird130 deg/s
SA342M Gazelle130 deg/s
UH-1H Iroquois118 deg/s
MH-60L Blackhawk110 deg/s
AW101 Merlin100 deg/s

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Rotor Blade Shear

Rotor blades can shear off on contact with geometry (trees, buildings, terrain):
SettingDefault
CZH_rotorBladeShear1 = blades shear on contact · 0 = no shear

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Rotor Disc Collision & Player Kill

SettingWhat it doesDefault
CZH_rotorDiscCollision1 = spinning rotor disc has physical collision1
CZH_rotorPlayerKillEnabled1 = players entering a spinning rotor disc are instantly killed1

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Making a Helicopter Invincible

Set all 6 zone values to 0 in the helicopter’s JSON config file: 
"CZH_dmgZoneChassis": 0,
"CZH_dmgZoneBody": 0,
"CZH_dmgZoneEngine": 0,
"CZH_dmgZoneFuel": 0,
"CZH_dmgZoneRotor1": 0,
"CZH_dmgZoneRotor2": 0

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Impact Damage

SettingWhat it doesDefault
CZH_dmgContactCoefImpact damage multiplier — lower = tougher airframeMD500: 0.080 · MH-6: 0.055 · SA342M: 0.065 · UH-1H: 0.055 · MH60L: 0.045 · AW101: 0.035
CZH_crashThresholdImpact sensitivity — higher = harder hits needed for heavy damageMD500: 12 · MH-6: 14 · SA342M: 13 · UH-1H: 20 · MH60L: 20 · AW101: 22
CZH_playerCrashDamage1 = crew take HP damage on hard impacts (per helicopter)0
CZH_playerCrashDamageMaxMax HP damage per impact — global setting in mod_config.json75