Which of the following item types is NOT found in the hangar?

In a hangar environment, the presence of various safety and operational equipment is crucial for maintaining the functionality and safety of aircraft operations. Portable CO2 fire extinguishers, electrical systems with cords for external power, and aircraft grounding points are essential components typically found in a hangar. These items play significant roles in fire safety, providing emergency power solutions, and ensuring safe electrical grounding to prevent static discharge, respectively.

Overhead cranes, on the other hand, while they may seem relevant in heavy maintenance or aircraft assembly contexts, are not considered a standard item within a hangar. Instead, overhead cranes are generally found in maintenance bays or facilities specifically designed for heavy lifting and component installation, rather than in the typical operational areas of a hangar where aircraft are parked and serviced. Thus, their absence from standard hangar inventory makes this choice the correct answer.