Final answer:
The Firex monitor and fire detection system tests are conducted during the normal Power-Up check as a part of the pre-flight safety procedures. These are crucial for ensuring the aircraft's safety and are not related to the in-flight operations or emergencies.
Step-by-step explanation:
The Firex monitor system test and fire detection system test are normally done during normal Power-Up check. This is an essential step in ensuring the safety of the aircraft, its passengers, and crew. These systems are critical for early detection and management of any fire-related emergencies on board an aircraft. The checks are performed before the engine start as part of pre-flight checks carried out by the flight crew or maintenance personnel.
As a thermodynamics engineer in the aeronautics industry, one might be involved in testing the fuel efficiency of a jet engine, as fuel efficiency directly relates to the engine's thermodynamic performance. While testing of landing gear, lift control devices, and autopilot functions are all crucial, they are normally conducted by engineers specialized in those respective systems rather than a thermodynamics engineer.