[{"data":1,"prerenderedAt":308},["ShallowReactive",2],{"learn-\u002Flearn\u002Fairspace-speed-limits":3,"learn-nav-\u002Flearn\u002Fairspace-speed-limits":284},{"id":4,"title":5,"body":6,"date":224,"description":225,"draft":226,"extension":227,"faqs":228,"howTo":238,"keyTakeaways":239,"meta":244,"navigation":245,"path":246,"quiz":247,"seo":271,"series":272,"seriesOrder":273,"sources":274,"stem":281,"topic":282,"__hash__":283},"learn\u002Flearn\u002Fairspace-speed-limits.md","The 250-knot speed limit and other airspace speed rules",{"type":7,"value":8,"toc":214},"minimark",[9,13,19,24,42,46,49,95,109,113,116,148,151,155,174,183,187,207,211],[10,11,12],"p",{},"The first time you level off in a descent and consciously hold the speed back to 250 knots, you are obeying one of the most universal rules in the air. The speed limits at lower levels are simple to state but easy to muddle, especially where a tighter limit bites near busy airspace, so it is worth getting the layers straight.",[14,15,16],"blockquote",{},[10,17,18],{},"This is general educational information, not operational, legal, or regulatory advice. Rules differ by authority and change over time. Always verify against current official sources and follow your operator's approved procedures.",[20,21,23],"h2",{"id":22},"why-low-level-speed-is-capped","Why low-level speed is capped",[10,25,26,27,32,33,37,38,41],{},"Below 10,000 feet is where the traffic mixes: fast aircraft, slow aircraft, and aircraft operating visually under ",[28,29,31],"a",{"href":30},"\u002Flearn\u002Fflight-rules-vfr-mvfr-ifr-lifr","VFR",", all sharing the same air, where see-and-avoid has to work. Slowing everyone down gives more ",[34,35,36],"strong",{},"time to see, decide and avoid",", and reduces the ",[34,39,40],{},"energy"," in any collision. That is the reasoning behind the basic limit, and it is why the rule lives at 10,000 feet, the level above which the traffic thins and oxygen requirements begin to limit who is there.",[20,43,45],{"id":44},"the-250-knot-rule","The 250-knot rule",[10,47,48],{},"The basic limit is the same on both sides of the Atlantic in substance, if not in wording:",[50,51,52,71],"ul",{},[53,54,55,56,62,63,66,67,70],"li",{},"The FAA, in ",[28,57,61],{"href":58,"rel":59},"https:\u002F\u002Fwww.ecfr.gov\u002Fcurrent\u002Ftitle-14\u002Fchapter-I\u002Fsubchapter-F\u002Fpart-91\u002Fsubpart-B\u002Fsubject-group-ECFRfc5e037d4ea2bb5\u002Fsection-91.117",[60],"nofollow","14 CFR 91.117",", prohibits more than ",[34,64,65],{},"250 knots indicated"," below ",[34,68,69],{},"10,000 feet MSL",".",[53,72,73,74,77,78,83,84,66,86,89,90,70],{},"EASA, in ",[34,75,76],{},"SERA.6001"," of the ",[28,79,82],{"href":80,"rel":81},"https:\u002F\u002Fwww.easa.europa.eu\u002Fen\u002Fdocument-library\u002Feasy-access-rules\u002Feasy-access-rules-standardised-european-rules-air-sera",[60],"Standardised European Rules of the Air",", sets the same ",[34,85,65],{},[34,87,88],{},"FL100",", drawing on ",[28,91,94],{"href":92,"rel":93},"https:\u002F\u002Fstore.icao.int\u002Fen\u002Fannex-2-rules-of-the-air",[60],"ICAO Annex 2",[10,96,97,98,101,102,108],{},"Both are written in ",[34,99,100],{},"indicated airspeed",", so the figure you hold is the one on the airspeed indicator, regardless of the groundspeed the wind gives you. The EASA limit is set by airspace class and does not bite in the higher-level controlled airspace (Class A and B), where ATC manages speed directly, but for the lower airspace a private flight crosses it amounts to the same 250-",[28,103,107],{"href":104,"className":105},"\u002Flearn\u002Fglossary#gt-knot",[106],"glossary-link","knot"," ceiling below FL100.",[20,110,112],{"id":111},"the-tighter-200-knot-limits","The tighter 200-knot limits",[10,114,115],{},"The FAA rule then adds slower limits for the busiest low-level airspace:",[50,117,118,132],{},[53,119,120,123,124,127,128,131],{},[34,121,122],{},"200 knots indicated"," at or below ",[34,125,126],{},"2500 feet above the surface within 4 nautical miles"," of the primary airport of ",[34,129,130],{},"Class C or Class D"," airspace;",[53,133,134,136,137,140,141,70],{},[34,135,122],{}," in the airspace ",[34,138,139],{},"beneath a Class B shelf"," or in a published ",[34,142,143,147],{},[28,144,31],{"href":145,"className":146},"\u002Flearn\u002Fglossary#gt-vfr",[106]," corridor through Class B",[10,149,150],{},"There is one relief valve: if the minimum safe speed for the aircraft's configuration is higher than a limit, the aircraft may be flown at that minimum safe speed, and the crew should let ATC know.",[20,152,154],{"id":153},"a-worked-example","A worked example",[10,156,157,158,161,162,165,166,169,170,173],{},"You are descending a fast aircraft toward a Class C airport. Passing ",[34,159,160],{},"10,000 feet"," you bring the speed back to ",[34,163,164],{},"250 knots"," indicated to satisfy the basic limit. Continuing down toward the field, you join the pattern below 2500 feet above the surface and inside 4 nautical miles of the primary airport, so now the ",[34,167,168],{},"200-knot"," limit applies, and you slow again. None of this depends on the wind: a 40-knot tailwind might give you a groundspeed well above 250 knots while your ",[34,171,172],{},"indicated"," speed sits right on the limit, which is exactly what the rule intends.",[10,175,176,177,179,180,182],{},"In European airspace the first step is identical in effect: through ",[34,178,88],{}," you are held to ",[34,181,164],{}," indicated under SERA.6001, with any further restrictions coming from the airspace and ATC.",[20,184,186],{"id":185},"common-pitfalls","Common pitfalls",[50,188,189,195,201],{},[53,190,191,194],{},[34,192,193],{},"Indicated, not ground."," A tailwind cannot bust the limit; the rule is on the airspeed indicator, not the GPS groundspeed.",[53,196,197,200],{},[34,198,199],{},"The 200-knot pockets are easy to forget."," Near Class C and D airports and under Class B, the limit drops; plan the second speed reduction, not just the first.",[53,202,203,206],{},[34,204,205],{},"Minimum safe speed is the only relief."," If your clean configuration needs more than the limit, you may use the minimum safe speed and tell ATC; it is not a general exemption.",[20,208,210],{"id":209},"in-pilot-efb","In Pilot EFB",[10,212,213],{},"Pilot EFB is a study and planning companion for the airspace you will cross and the rules that go with it, alongside your weather, NOTAMs and flight time in one offline-first place. It does not monitor your speed or replace the regulations and your charts, so fly the published limits from your official source of record. Pilot EFB is not a certified Electronic Flight Bag, so treat it as a study and planning aid and brief from your official source of record.",{"title":215,"searchDepth":216,"depth":216,"links":217},"",2,[218,219,220,221,222,223],{"id":22,"depth":216,"text":23},{"id":44,"depth":216,"text":45},{"id":111,"depth":216,"text":112},{"id":153,"depth":216,"text":154},{"id":185,"depth":216,"text":186},{"id":209,"depth":216,"text":210},"2026-06-22","Why there is a 250-knot speed limit below 10,000 feet, the slower 200-knot limits near and under busy airspace, and how the FAA and EASA wordings line up and differ, with a worked descent that puts the rules in order.",false,"md",[229,232,235],{"q":230,"a":231},"Why is there a 250-knot speed limit below 10,000 feet?","Lower levels are where most traffic mixes, including slower aircraft and aircraft operating visually, and where see-and-avoid has to work. Capping speed at 250 knots indicated below 10,000 feet (FL100 in the European wording) gives crews more time to see, decide and avoid, and limits the energy in a collision. The FAA sets it in 14 CFR 91.117 and EASA in SERA.6001.",{"q":233,"a":234},"When does a 200-knot limit apply instead of 250?","Under the FAA rules, 200 knots indicated applies at or below 2500 feet above the surface within 4 nautical miles of the primary airport of Class C or Class D airspace, and in the airspace beneath a Class B shelf or in a published VFR corridor through Class B. These are the busiest, most congested pockets of low-level airspace, so the limit is tighter still.",{"q":236,"a":237},"Are these speed limits indicated airspeed or groundspeed?","Indicated airspeed. The rules are written as 250 knots and 200 knots indicated airspeed, not groundspeed, because the limit is about manoeuvring and reaction time through the air, which the airspeed indicator shows directly. A strong tailwind can give a much higher groundspeed while you remain legally and sensibly within the indicated limit.",null,[240,241,242,243],"Below 10,000 feet (FL100) the basic limit is 250 knots indicated, set by the FAA in 14 CFR 91.117 and EASA in SERA.6001.","A tighter 200-knot limit applies under the FAA rules near Class C and D airports and under or through Class B airspace.","The limits are indicated airspeed, not groundspeed, so a tailwind can give a higher groundspeed while you stay within them.","The purpose is more time to see and avoid where traffic mixes, and less energy in any collision.",{},true,"\u002Flearn\u002Fairspace-speed-limits",[248,255,263],{"q":249,"options":250,"answer":253,"explanation":254},"What is the basic speed limit below 10,000 feet (FL100)?",[122,65,251,252],"300 knots indicated","No limit",1,"Both the FAA (14 CFR 91.117) and EASA (SERA.6001) set a basic limit of 250 knots indicated airspeed below 10,000 feet, or FL100 in the European wording.",{"q":256,"options":257,"answer":253,"explanation":262},"Under the FAA rules, when does a 200-knot limit apply?",[258,259,260,261],"Above 18,000 feet","At or below 2500 feet above the surface within 4 nautical miles of a Class C or D primary airport, and under or through Class B","Everywhere below 10,000 feet","Only at night","The 200-knot limit applies at or below 2500 feet AGL within 4 nautical miles of the primary Class C or D airport, and in the airspace under a Class B shelf or in a VFR corridor through Class B.",{"q":264,"options":265,"answer":253,"explanation":270},"Are the airspace speed limits expressed as indicated airspeed or groundspeed?",[266,267,268,269],"Groundspeed","Indicated airspeed","True airspeed","Mach number","The limits are written in knots indicated airspeed, because they are about manoeuvring and reaction time through the air; a tailwind can give a higher groundspeed within the indicated limit.",{"title":5,"description":225},"plan-a-vfr-cross-country",7,[275,277,279],{"label":276,"url":58},"14 CFR 91.117: Aircraft speed",{"label":278,"url":80},"EASA Easy Access Rules for Standardised European Rules of the Air (SERA.6001)",{"label":280,"url":92},"ICAO Annex 2: Rules of the Air","learn\u002Fairspace-speed-limits","Operations","BS7LR78ispXTJvBbwsl95Frk3PNrbbhvx1Ijcqaikt0",{"related":285,"newer":238,"older":301,"series":306},[286,292,297],{"path":287,"title":288,"description":289,"date":224,"topic":282,"draft":226,"minutes":290,"series":272,"seriesOrder":291},"\u002Flearn\u002Fminimum-safe-altitudes-msa-mora-mea-moca","Minimum safe altitudes: MSA, MORA, MEA, MOCA and MEF","The family of minimum altitudes that keep you clear of terrain and obstacles, what each one guarantees, and the difference between an altitude that also promises navigation signal and a chart figure that only tells you the highest obstacle.",3,6,{"path":293,"title":294,"description":295,"date":224,"topic":282,"draft":226,"minutes":296,"series":238,"seriesOrder":238},"\u002Flearn\u002Freading-an-instrument-approach-chart","Reading an instrument approach chart","How an instrument approach chart is laid out, what the plan view, profile view, minimums box and missed approach each tell you, and how to read one in order so you brief the approach the way you will fly it.",4,{"path":298,"title":299,"description":300,"date":224,"topic":282,"draft":226,"minutes":296,"series":238,"seriesOrder":238},"\u002Flearn\u002Fsids-and-stars-explained","SIDs and STARs explained","What standard instrument departures and standard terminal arrival routes are, why they exist, and how to read the climb gradients and crossing restrictions that turn a busy terminal area into orderly, repeatable traffic flows.",{"path":302,"title":303,"description":304,"date":224,"topic":305,"draft":226,"minutes":290,"series":238,"seriesOrder":238},"\u002Flearn\u002Fcloud-types-explained","Cloud types and what they tell a pilot","The ten cloud genera grouped into high, middle and low, the difference between heaped and layered cloud, and how to read what each type is telling you about stability, moisture and the weather ahead.","Weather",{"slug":272,"title":307,"part":273,"total":273,"prev":286,"next":238},"Plan a VFR cross-country",1782089963502]