True or False: The speed break is usable with the emergency system.

The choice that indicates the speed brake is not usable with the emergency system is based on the design and functionality of the speed brake in the aircraft. The speed brake system is intended for normal operational use, primarily to increase drag and reduce speed during descent and landing phases.

In emergency situations, however, the control of the speed brake is typically overridden or disabled to maintain pilot control over the aircraft’s performance. The focus during emergencies is often on stabilizing the aircraft and ensuring safe maneuverability rather than on modifying its speed with a device that could add complications to the situation.

If flown under emergency conditions, pilots need to rely on other systems and procedures tailored toward safe recovery. Hence, it's essential for pilots to know that the emergency system does not permit the use of the speed brake, aligning with the understanding that certain systems must remain intact and functional for flight safety during critical scenarios.