weather minimum


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weather minimum

[′weth·ər ‚min·ə·məm]
(meteorology)
The worst weather conditions under which aviation operations may be conducted under either visual or instrument flight rules; usually prescribed by directives and standing operating procedures in terms of minimum ceiling, visibility, or specific hazards to flight.

weather minimum

The worst weather conditions in terms of visibility, RVR (runway visual range), and cloud ceiling for landing at a given runway or landing field either under conditions of visual flying or of instrument flying. These conditions are prescribed by directives and standing operating procedures in terms of minimum ceiling, visibility, RVR, or specified hazards to flight. The appropriate regulatory authority (e.g., FAA) lays down these conditions. The operator may lay down additional restrictions over and above those laid down by the authority. Also called weather minima.
References in periodicals archive ?
Radar is required and the weather minimums are 3000-5.
If not instrument-rated, recognize you'll need to apply higher weather minimums to your operation to provide adequate margins and mitigate risks associated with marginal weather.
Weather minimums, degraded ASE (automatic stabilization equipment) and flight-minimums SOPs can be waived with battle-captain approval.
A combination of better instrumentation, better approach aids, and strict adherence to weather minimums would make it easier for today's pilots to make the call not to fly.
Let's stop right here and ask the question, "With the weather minimums continuing to drop, just how far along an approach can we wave an aircraft without a paddles contact?
Other exemptions are made for the selection of alternate airport weather minimums.
Through our troubleshooting of the INS, mental calculations of the decreasing weather minimums and listening to approach bark at us, the concept that the NAVAID and the field were not colocated completely dropped from my scan.
Special VFR weather minimums for fixed wing aircraft are reduced to a mere one mile of flight visibility and the straightforward requirement to remain clear of clouds when operating within Class B, C, or D surface areas.
Personal minimums, of course, generally are a set of conditions--not unlike the basic VFR weather minimums or the ceiling and visibility requirements for an instrument approach, but also involving other operational considerations--beyond which a pilot vows not to fly.
What would be your required weather minimums at your alternate if you were flying a helicopter instead of an airplane?
If you can't meet the weather minimums (visibility and ceiling) or a specified climb gradient for a particular runway, or if the runway is marked as not authorized, then you can't use it for an IFR departure under Part 135.