Scene Context: Sarah detects a microscopic increase in current consumption by the antenna servos after the impact. Commander Wayne categorically forbids deploying it, fearing a jolt and a shift in the ship's center of mass before the Martian landing.
Essence of the Phenomenon: The electrical circuit of the integrity sensor remained unbroken (so the computer reports a "green board"), but the impact deformed the metal housing. The electric motor tries to hold the jammed mechanism in its specified position, expending extra milliamperes of current to overcome mechanical resistance.
Scientific Basis: The commander's decision to sacrifice the backup antenna is dictated by the laws of orbital mechanics. In a vacuum, a spacecraft is a closed physical system. According to the law of conservation of angular momentum, extending any massive component will shift the ship's overall center of mass. Furthermore, if the mechanism is damaged, the antenna might jam halfway. An asymmetrical center of mass is fatal during main engine burns: instead of flying straight, the ship will begin to spin uncontrollably and veer completely off course.
Current Limitations: Onboard diagnostic electronics perfectly detect open circuits or pressure drops, but they are often "blind" to mechanical fatigue, microcracks, or hidden metal deformations unless a strain gauge is installed in that exact location. In astronautics, the rule "do not touch what is not critically necessary for survival" is a fundamental law of safety.