What is the 321 rule for IFR?

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.



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You need to name an alternate airport on your IFR flight plan if, for the period of time one hour before and one hour after your estimated time of arrival, the weather is forecast to include a ceiling of 2,000 feet agl and/or visibilities less than three statute miles (the 1-2-3 rule).

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A ceiling of at least 600 feet and a visibility of two statute miles if the airport has a precision approach (ILS Approach) A ceiling of at least 800 feet and a visibility of two statute miles if the airport has a non-precision approach (RNAV/GPS or VOR)

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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.

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In aviation medicine, the 1% rule is a risk threshold that is applied to the medical fitness of pilots. The 1% rule states that a 1% per annum risk (See also risk management) of medical incapacitation is the threshold between acceptable and unacceptable.

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(1) A rest required under paragraph (b)(1) of this section may be scheduled for or reduced to a minimum of 8 hours if the flight crewmember is given a rest period of at least 10 hours that must begin no later than 24 hours after the commencement of the reduced rest period.

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  • instrument approaches.
  • H. Holding procedures.
  • I. Intercepting courses.
  • T. Tracking courses.
  • S. use of navigational electronic System.
  • If not current within 6 months. you can log required time with a safety pilot, examiner, or instructor.
  • If not current within 12 months. ...
  • To carry passengers as PIC (day)


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Standard takeoff minima are one statute mile for aircraft having two engines or less and one-half statute mile for aircraft having more than two engines. Specified ceiling and visibility minima will allow visual avoidance of obstacles during the initial climb at the standard climb gradient.

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IFR means a ceiling less than 1,000 feet AGL and/or visibility less than three miles. Low IFR (LIFR) is a sub-category of IFR. VFR means a ceiling greater than 3,000 feet AGL and visibility greater than five miles.

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MARVELOUS VFR C500 (Mandatory IFR Reports) M ? Missed approach. A ? Airspeed changes more than 10 knots or 5 percent. R ? Reaching a holding fix. V ? VFR-on-top altitude changes. E ? ETA change more than 3 minutes (no radar)

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As part of the testing of a new aircraft, the manufacturer must demonstrate that all passengers can be evacuated in a short amount of time when an emergency arises - within 90 seconds to be precise. If it doesn't comply, the aviation authorities won't approve its safety certification.

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The 1 - 3 - 6 Rule for IFR Flight Planning. predominant weather at your ETA through 1 hour after ETA must be equal to or greater than the military weather planning minimums for the approach you intend to fly at that destination.

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If a usable precision approach is available: 600' ceilings AND 2 SM of visibility. If only a non-precision approach is useable: 800' AND 2 SM of visibility. If no instrument approaches are available: Descent from the MEA and landing must be conducted under basic VFR.

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The 40:1 surface is calculated out to 22.09 nautical miles from the runway end within an arc of 180° centered along the runway centerline extended. These requirements are part of FAR Part 77.23(a)(3). This is TERPS criteria. The standard aircraft departure climb gradient (CG) is 200 feet per nautical mile.

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