A recurring procedural debate in IFR operations centers on a scenario that is both common and consequential: a pilot is cleared for an instrument approach to one runway while the ATIS confirms a different runway is in use, making a circling maneuver a near-certainty. The core question is whether to fly to the straight-in MDA for the procedure runway until tower explicitly issues a circling clearance, or to plan to circling minimums from the outset. The original poster's instinct reflects sound airmanship: if the pilot knows a circle will be required, circling minimums govern the approach from the time the final approach course is commenced, not after tower makes the handoff.
The regulatory and procedural basis for this position is grounded in 14 CFR 91.175 and AIM guidance on circling approaches. Circling minimums are published specifically to provide obstacle clearance throughout the maneuvering area around the airport during the visual portion of the approach — an area that can extend significantly depending on aircraft approach category. Descending to the lower straight-in MDA and then attempting to maneuver visually for a different runway would place the aircraft below the obstacle clearance floor for that visual segment. The approach clearance issued by ATC authorizes the instrument procedure; it does not dictate what the pilot intends to do once visual, and it certainly does not override the pilot's responsibility to apply the correct minimums for the type of maneuver being executed. Being cleared for the VOR/TACAN RWY 32 while intending to circle to RWY 5 means the circling MDA is the operative floor, period.
The tower handoff timing is a secondary issue and somewhat of a red herring in this debate. The clearance to land — whether on the procedure runway or via a circle — is a traffic and sequencing function of tower control, not a trigger for which set of minimums applies. Waiting for tower to formally clear a circling maneuver before mentally switching to circling minimums introduces unnecessary ambiguity and creates risk if the pilot has already descended toward the straight-in MDA. Professionals operating under Part 135 or 91K should also note that many OpSpecs impose restrictions on circling approaches — including night circling prohibitions and category-based weather floors — making pre-flight planning to circling minimums not just the correct technique but often a regulatory requirement before the approach ever begins.
This debate surfaces a broader skills gap in the IFR community surrounding circling approaches, which have historically accounted for a disproportionate share of controlled-flight-into-terrain accidents during the approach phase. NTSB data has repeatedly pointed to pilots descending below circling MDA, losing visual contact, and failing to execute the missed approach. The FAA's 2012 revision to circling approach protected area construction and the expansion of protected radii by aircraft category were direct responses to this accident record. For professional pilots operating at unfamiliar fields or in reduced visibility, pre-briefing the circling MDA, identifying the location of the procedure runway relative to obstacles, and mentally committing to a missed approach trigger before commencing the circle remain the foundational risk mitigations — all of which begin at the planning stage, not at the moment tower transmits a clearance.