MTR390-E is the enhanced MTR390 turboshaft variant used by the Airbus Helicopters Tiger HAD retrofit. Airbus identifies two enhanced MTR390-E engines on the HAD; MTU documents the MTR390-E branch as adding 14 percent power over the baseline MTR390-2C. This active model is now linked to the canonical MTR390 family; exact Tiger vehicle-family relationship remains separately managed.