A broken fan blade will cause the engine to vibrate and make it dangerous to operate.
- On fans with an equal number of blades equally spaced, remove the remainder of the broken blade, and then remove the blade located opposite the removed broken blade. The vehicle can then operate, but be careful that it does not overheat.
- On fans with unequally spaced blades, the entire fan can operate under the light load for short periods of time. Trimming a small amount of fan blades opposite of the broken blade may also help to reduce vibration.
Source: U.S. Army FM 4-30.31, Recovery and Battle Damage Assessment and Repair