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Private pilot · ACS PA.I.E · Instructor lesson plan

National Airspace System

Student pack: Train: National Airspace System · Full lesson: Prepare guide

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1 · Objective

By the end of this lesson your student can explain national airspace system in their own words and apply it to a realistic flight, to the ACS standard for PA.I.E.

Why it matters for safety: Airspace exists to separate traffic and protect people on the ground. Busting a Class B shelf, wandering into a TFR, or pushing VFR minimums into cloud puts you where other airplanes and ATC don't expect you. Knowing the boundaries, the entry requirements and the weather minimums is how you fly predictably and safely around everyone else.

2 · Assign before the lesson

Pre-work: the free Train pack, National Airspace System. Airspace classes, what you need to enter each, VFR weather minimums, and special use airspace.

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Pack: pilotprep.pro/train/ppl/national-airspace-system · Full lesson: pilotprep.pro/prepare/ppl/national-airspace-system

3 · Teach sequence

Key points to land

  • Class B: an ATC clearance ("cleared into the Class Bravo"), a two-way radio, a Mode C transponder and ADS-B Out; 3 statute miles and clear of clouds.(14 CFR 91.131, 91.155)
  • Class C: establish two-way radio communication before entering, plus a Mode C transponder and ADS-B Out; 3 miles, 500 below, 1,000 above, 2,000 horizontal.(14 CFR 91.130, 91.155)
  • Class D: establish two-way radio communication before entering; 3 miles, 500 below, 1,000 above, 2,000 horizontal.(14 CFR 91.129, 91.155)
  • Class E below 10,000 MSL: 3 miles, 500/1,000/2,000. At or above 10,000 MSL: 5 miles, 1,000 below, 1,000 above, 1 mile horizontal.(14 CFR 91.155)
  • Class G at or below 1,200 AGL by day: 1 mile and clear of clouds. At night: 3 miles, 500/1,000/2,000.(14 CFR 91.155)
  • Speed (indicated): 250 knots below 10,000 MSL; 200 knots at or below 2,500 AGL within 4 nm of a Class C or D primary airport (not inside Class B, where 250 applies); and 200 knots in the airspace under a Class B shelf or in a VFR corridor through it.(14 CFR 91.117(a)-(c))
  • Check TFRs and NOTAMs before every flight; prohibited areas are off-limits, restricted areas need permission.(14 CFR 91.103, 91.133, 91.137-91.145)

The classes and what they require

  • Class A: 18,000 feet MSL up to FL600. No VFR at all: an instrument-rated pilot on an IFR flight plan with an ATC clearance, a two-way radio, a Mode C transponder and ADS-B Out.(AIM chapter 3, Airspace; 14 CFR 91.135, 91.215, 91.225)
  • Class B generally extends from the surface to 10,000 feet MSL around the busiest airports, in individually tailored layers shaped to contain the instrument procedures.(AIM chapter 3, Airspace)
  • Class B: around the busiest airports, shaped like an upside-down wedding cake. Needs an ATC clearance, a two-way radio, a Mode C transponder and ADS-B Out. A private pilot may enter; student pilots need an endorsement, and some primary airports don't allow student operations.(14 CFR 91.131)
  • Mode C and ADS-B Out are also required within 30 nm of a Class B primary airport (the Mode C veil), in and above Class C up to 10,000 MSL, and in Class E at or above 10,000 MSL (except at or below 2,500 AGL).(14 CFR 91.215, 91.225)
  • Class C: typically a 5 nm core from the surface to 4,000 feet above the airport and a 10 nm shelf from 1,200 feet. The shelf's ceiling is also 4,000 feet above the airport. Around it is a procedural Outer Area, normally 20 nm, uncharted, where participation isn't required the same way. Charted Class B and C altitudes are MSL, even though the textbook describes them above the airport.(14 CFR 91.130; AIM 3-2-4)
  • Two-way communication for Class C and D: a reply using your call sign, even "[call sign], stand by", establishes it and you may enter, unless the reply tells you to remain outside ("[call sign], remain outside the Class Charlie and stand by"). A reply without your call sign ("aircraft calling Approach, stand by") does not establish it: stay out.(14 CFR 91.130(c), 91.129(c); AIM 3-2-4, 3-2-5)
  • Class D: around towered airports, typically up to 2,500 feet above the airport. Establish two-way communication before entering. Class D itself requires only the radio: no transponder or ADS-B Out (unless other rules, such as the Mode C veil, apply). When the tower closes, it usually becomes Class E or G; check the Chart Supplement.(14 CFR 91.129; AIM 3-2)
  • Class E: controlled airspace that isn't A, B, C or D. It may start at the surface, at 700 or 1,200 feet AGL, or at other altitudes. No communication is required for VFR.(AIM chapter 3, Airspace)
  • Class G: uncontrolled airspace below Class E.(AIM chapter 3, Airspace)

VFR weather minimums

  • Class B: 3 statute miles, clear of clouds.(14 CFR 91.155)
  • Class C, D and E below 10,000 MSL: 3 miles; 500 feet below, 1,000 above, 2,000 horizontal from clouds.(14 CFR 91.155)
  • Class E at or above 10,000 MSL: 5 miles; 1,000 below, 1,000 above, 1 mile horizontal.(14 CFR 91.155)
  • Class G at or below 1,200 AGL: day 1 mile, clear of clouds; night 3 miles, 500/1,000/2,000 (or 1 mile and clear of clouds in a traffic pattern within half a mile of the runway).(14 CFR 91.155)
  • Class G above 1,200 AGL below 10,000 MSL: day 1 mile, 500/1,000/2,000; night 3 miles, 500/1,000/2,000. Above 10,000 MSL: 5 miles, 1,000/1,000/1 mile.(14 CFR 91.155)
  • Two separate rules, except under special VFR (91.157): you may not fly under VFR beneath a ceiling of less than 1,000 feet anywhere within the lateral limits of a surface area of controlled airspace (91.155(c)); and you may not take off, land, or enter the traffic pattern in a Class B, C, D or E surface area unless the ground visibility there is at least 3 statute miles, or the flight visibility is if ground visibility isn't reported (91.155(d)).(14 CFR 91.155(c)-(d); 91.157)

Reading the chart

  • Class B: solid blue lines. Class C: solid magenta. Class D: dashed blue. Class E to the surface: dashed magenta.(FAA Aeronautical Chart User's Guide)
  • Class E starting at 700 feet AGL: the faded magenta edge (vignette). Starting at 1,200 feet AGL: the faded blue edge.(FAA Aeronautical Chart User's Guide)
  • Altitude labels like 80/40 in Class B or C mean a ceiling of 8,000 and a floor of 4,000 feet MSL.(FAA Aeronautical Chart User's Guide)

Special use airspace, TFRs and other areas

  • Prohibited areas: flight not allowed. Restricted areas: not allowed when active without permission from the controlling agency.(14 CFR 91.133; AIM 3-4)
  • Military operations areas (MOAs): VFR flight is allowed, but watch for fast military traffic and ask ATC whether they're active. Warning areas extend from 3 nm outward from the U.S. coast with activity that may be hazardous; the U.S. doesn't have sole jurisdiction, so no permission is needed, but use caution. Alert areas have a high volume of pilot training or unusual aerial activity: use caution. Controlled firing areas aren't charted, because the activity stops when an aircraft approaches. National security areas: you are asked to avoid them voluntarily, and flight may be temporarily prohibited.(AIM 3-4-1 to 3-4-8)
  • Other areas: a TRSA isn't an airspace class (its primary airport is Class D); VFR participation is voluntary and gives radar service. Military training routes: IR flown under IFR, VR under VFR; four-digit routes stay at or below 1,500 AGL, three-digit routes have a segment above it, and military aircraft may exceed 250 knots below 10,000 MSL, so cross them with vigilance and don't follow them. Also know ADIZ rules (a flight plan, a discrete code and two-way radio), parachute jump areas, and published VFR flyways and transition routes.(PHAK (FAA-H-8083-25C), Ch. 15; AIM 3-5)
  • Temporary flight restrictions (TFRs) cover VIP movements, stadiums, fires and other events. They're in the NOTAMs; check them before every flight.(14 CFR 91.137-91.145; AIM 3-5)
  • Special flight rules areas, like the Washington, DC SFRA, have their own rules and required training.(14 CFR Part 93; 91.161)

Special VFR

  • Special VFR lets you operate below VFR minimums within the surface area of controlled airspace, below 10,000 MSL, with an ATC clearance. You must ask for it; ATC doesn't offer it.(14 CFR 91.157)
  • You need at least 1 statute mile flight visibility and must stay clear of clouds. To take off or land, ground visibility must be at least 1 statute mile (flight visibility, if ground visibility isn't reported). Fixed-wing special VFR isn't allowed at the airports in Part 91, Appendix D, Section 3 (charted "NO SVFR").(14 CFR 91.157; Part 91, Appendix D)
  • At night (sunset to sunrise), special VFR requires the pilot to be instrument rated and current, and the airplane equipped for IFR under 91.205(d).(14 CFR 91.157(e))

4 · Ask your student

In order: recall, then understanding, then applying it. Move up only when the answer shows it.

  1. Recall · What do you need to enter Class C airspace?

    A strong answer: Two-way radio communication established before entering, a Mode C transponder and ADS-B Out.

  2. Understand · The controller answers your call with "Aircraft calling Approach, stand by." Can you enter Class C?

    A strong answer: No. They didn't use my call sign, so two-way communication isn't established. If they had said my call sign, even with "stand by", I could enter.

  3. Apply · You're VFR at 2,000 feet AGL in Class E, and clouds ahead are at about 2,400. Can you continue at this altitude?

    A strong answer: No: I need 500 feet below clouds, so 1,900 or lower, and still clear of terrain and obstacles. Otherwise I turn around or divert.

Scenarios to talk through

  • You call Approach to transit a Class B. The controller says: "N123AB, radar contact, maintain VFR at or below 3,500." Can you enter the Class B?

    Sound decision: No. You need to hear "cleared into the Class Bravo airspace". Radar contact isn't a clearance. Stay outside until you're cleared.

  • Your home airport's tower closes at 9 p.m. You plan to land at 10 p.m. What airspace will it be, and how do you find out?

    Sound decision: Usually Class E or G after the tower closes. The Chart Supplement lists the hours and what the airspace becomes. Use the CTAF.

  • The METAR at a Class D airport shows visibility 2 miles in mist and a ceiling of 800 feet. You want to land there. What are your options?

    Sound decision: Under basic VFR you can't enter the surface area for landing. You could request special VFR by day (1 mile, clear of clouds), if you're comfortable and it's within your minimums; otherwise divert.

  • Your route crosses a MOA. Flight Service says it's active. Can you fly through?

    Sound decision: VFR flight through a MOA is legal, but military aircraft may be maneuvering fast. Consider routing around, or ask ATC for traffic information while crossing.

5 · Common student errors

  • Treating "radar contact" as permission to enter Class B.

    Why it matters: Only "cleared into the Class Bravo" is a clearance.

    How to correct it: Wait for the explicit clearance.

  • Mixing up the cloud clearances.

    Why it matters: Class B is clear of clouds; C, D and E are 500 below, 1,000 above, 2,000 horizontal.

    How to correct it: Learn the table by class and altitude, and day versus night in Class G.

  • Skipping a TFR check on a short local flight.

    Why it matters: TFRs pop up for VIPs, fires and stadiums, sometimes the same day.

    How to correct it: Check NOTAMs and TFRs right before every flight.

6 · Completion standard

  • Your student answers each "Ask your student" question in their own words, up to the Apply level, without prompting.
  • They talk through the scenarios and reach a safe, legal decision, explaining why.
  • They complete the pack’s quick check and can say what they flagged.

Area trained? Close out with a practice oral focused on PA.I.E: pilotprep.pro/exam?exam=PPL&focus=PA.I.E

7 · References

  • 14 CFR Part 91, 91.117, 91.126-91.135, 91.137-91.145, 91.155, 91.157, 91.215, 91.225
  • AIM, Chapter 3, Airspace
  • Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Airspace
  • FAA Aeronautical Chart User's Guide
  • Airman Certification Standards, task PA.I.E

PilotPrep instructor lesson plan, from the National Airspace System lesson (checked against current FAA sources 2026-11-12). A study and teaching aid, not FAA guidance; teach to your own judgment and the current ACS.