*In the event the saucer module is disabled near a planetary body and cannot maintain a stable orbit, landing the saucer on the planet's surface is a final emergency option. Impulse engines fire to bring the saucer out of orbit, while the deflector field is used to perform airflow and steering changes while descending into the atmosphere. SIF and IOF fields are set to maximum to absorb the brunt of the saucer's ground impact. It is assumed that the space operational service of the saucer would be totally lost due to deep, unrecoverable alloy stress damage. While extensive computer simulations have been performed, this procedure has never actually been attempted in a Galaxy class vessel. *Source: Back of card