What is the 123 rule in aviation?

It’s called the 3-2-1 rule, and it’s the easiest way to remember the regulation. To recap, if the weather at your destination isn’t at least 3 SM of visibility and 2000′ AGL ceilings from 1 hour before to 1 hour after your ETA, you need to file an alternate.

What are the standard alternate minimums?

The standard alternate minimums are simple: 600-2 for precision approaches, and 800-2 for non-precision approaches. But non-standard alternate minimums can seem quite complicated.

What is remove alternate?

A Take-off alternate is an aerodrome at which an aircraft would be able to land should this become necessary shortly after take-off and it is not possible to use the aerodrome of departure.

Can any airport be used as an alternate?

2-11] Not all airports can be used as alternate airports. For an airport to be used as an alternate, the forecast weather at that airport must meet certain qualifications at the estimated time of arrival. Standard alternate minimums for a precision approach are a 600-foot ceiling and 2 SM visibility.

What is a takeoff alternate?

What is RVR in aviation?

The RVR (Runway Visual Range) is required to support precision landing and takeoff operations in the NAS . The system measures visibility, background luminance, and runway light intensity to determine the distance a pilot should be able to see down the runway.

Can you take off in zero visibility?

Where those flying under Parts 135 and 121 need to observe at least their standard, one-statute-mile (for single- and twin-engine aircraft) or one-half-statute-mile (for more than two engines, or helicopters) takeoff visibility minimums, under Part 91 we’re able to take off in zero-ceiling, zero-visibility conditions.

What is Baro VNAV approach?

Barometric Vertical Navigation (Baro-VNAV) is an Instrument Approach Procedure utilising lateral and vertical guidance. This capability of GNSS enhances the integrity and safety for GNSS approaches and may support lower approach minima’s (DA – Decision Altitudes), as low as 250ft height above touch down (HAT).

Can an airport that only has a GPS be filed as an alternate?

According to the new policy, which will be added to future versions of the AIM, advisory circulars, and other documents, pilots with non-WAAS GPS navigators can now file an alternate airport that is served only by GPS-based instrument approaches, provided the original destination airport has ground-based procedures, or …