AGL Ceiling Knot 
Aerotime
MARCH 21, 2025
TSB Approach sequence Due to reported wind gusts as the CRJ900 approached Toronto Pearson following a flight from MinneapolisSaint Paul International Airport (MSP) the aircraft was flown at 149 knots. seconds before touchdown the aircrafts indicated airspeed was 136 knots, and its ground speed was 111 knots.
Plane and Pilot
AUGUST 6, 2024
The route is simple, GPS direct, but…there’s my personal 1,000-foot en route ceiling requirement, and those silly Smoky Mountains. Also, from when I lived out West, there was the mountaintop clearance guideline—1,000 feet for every 10 knots of wind, with 30 knots meaning no-go. It was now time to plan the trip.
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Flight Training Central
FEBRUARY 17, 2024
AIM 5-3-3 ) Change in the average true airspeed (at cruising altitude) when it varies by 5 percent or 10 knots (whichever is greater) from that filed in the flight plan. ( Each is defined by varying ceilings and visibility. IFR = Ceilings between 500’ and 999’ AGL and/or visibility between 1 and 3 miles.
Plane and Pilot
NOVEMBER 27, 2024
Often, turbulence is the harbinger of mountain waves, not the ideal ceiling—and visibility unlimited—day. FAA weather charts can help for higher altitudes but when just a few thousand feet agl, they may be less useful. Eighty-knot tailwinds aloft and higher-than-normal temperature difference between the surface and aloft.
Pilot Institute
MARCH 6, 2025
AGL Above Ground Level AGL is simply a way to tell the basis from which any given height or altitude is measured. Simply put, 400 feet AGL means that the 400 feet is measured from the underlying ground surface above the specific airspace. This is as opposed to other altitude measurements, such as AMSL or above mean sea level.
iPad Pilot News
JUNE 14, 2024
The AC states limited coverage below 5,000′ AGL, but in our experience you should start getting reception within 1,000′ AGL in all but the most remote or mountainous regions. For example, ground-based systems that require a line of sight may have relatively limited coverage below 5,000 feet above ground level (AGL).
Pilot Institute
NOVEMBER 5, 2024
Cloud ceilings below 1,500 feet or cumulonimbus clouds can trigger a SPECI. A sudden wind shift, a 10-knot or greater speed increase, a 45-degree or more direction change, or gusts exceeding limits may also cause a SPECI. This includes the wind direction in degrees and the wind speed in knots.
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