Final answer:
The 'far end RVR' typically is not controlling for takeoff unless specified by procedures or necessary for performance calculations. Takeoff minimums are determined by the touchdown, midpoint, and rollout RVR sensor readings, depending on current regulations and airline operating procedures.
Step-by-step explanation:
The subject in question relates to aviation and specifically to the takeoff requirements at airports with long runways equipped with Runway Visual Range (RVR) sensors. During takeoff, pilots must comply with specified minimums for visibility and runway visual range. Factors like airport equipment, runway length, and weather conditions determine which RVR readings are controlling. At airports like Denver International (DEN), with RVR sensors at different points along the runway, including one at the far end, it is typically the 'touchdown' RVR sensor, 'midpoint' RVR sensor (if available), and the 'rollout' or takeoff RVR sensor readings that are most significant when determining minimums for takeoffs.
However, the far end RVR may not be directly controlling for takeoff unless specified in airport or airline procedures, or in conditions where it might be necessary for aircraft performance calculations or contingency planning. Pilots and operators always refer to the current FAA regulations, NOTAMs (Notice to Airmen), and the specific airline's operating procedures to determine which RVR readings are controlling for takeoff. It's important for safety and compliance that all RVR sensors are considered in the broader context of the prevailing visibility, weather conditions, and operational requirements at the time of departure.