National Airspace System

(91.155(a), for aircraft other than helicopters.) The Class B "clear of clouds" is the one students misuse — it exists because ATC is separating you, not because the weather is better.

• Ceiling below 1,000 feet: no VFR operation beneath it within the lateral boundaries of controlled airspace designated to the surface for an airport (91.155(c))
• Ground visibility below 3 SM: no takeoff, landing, or traffic pattern entry under VFR within the surface areas of Class B, C, D, or E designated for an airport — unless ground visibility isn't reported, in which case flight visibility during landing, takeoff, or in the pattern must be at least 3 SM (91.155(d))
• Base altitude: an aircraft operating at the base altitude of a Class E area is considered to be within the airspace directly below it (91.155(e))

There is also a night Class G exception: with visibility less than 3 SM but not less than 1 SM at night, operating in a traffic pattern within 1/2 mile of the runway, an airplane may operate clear of clouds (91.155(b)(2)).

SVFR may be conducted below 10,000 ft MSL, within the airspace contained by the upward extension of the lateral boundaries of controlled airspace designated to the surface for an airport, in place of the 91.155 minimums (91.157(a)). It requires:

• An ATC clearance
• Clear of clouds
• At least 1 SM flight visibility (except helicopters)
• Between sunrise and sunset (except helicopters), unless the pilot meets the applicable part 61 instrument requirements and the aircraft is equipped as required by 91.205(d) (91.157(b))

Some airports prohibit fixed-wing SVFR entirely — see appendix D, section 3 of part 91, and the "NO SVFR" notation on the chart.

Teaching angle: SVFR is legal and frequently a bad idea. Make the student articulate what SVFR actually buys — the airspace, not the weather — and what it costs: 1 SM visibility, clear of clouds, in the busiest airspace on the field.

• An ATC clearance from the facility having jurisdiction before operating in the area (91.131(a)(1)) — "cleared into the Class Bravo," not just a radio call
• The PIC must hold at least a private pilot certificate, or a recreational or sport certificate having met the applicable 61.101(d), 61.94, or 61.325 requirements — or be a student pilot with the training and endorsements of 61.95 (91.131(b))
• Pilot training operations at an airport within Class B must comply with any ATC-established procedures for such operations (91.131(a)(3))
• Speed 200 knots or less in the airspace underlying a Class B area, or in a VFR corridor through it (91.117(c))

Student endorsements: 61.95(a) for solo flight in Class B, and 61.95(b) with 91.131(b)(1) for solo to, from, or at an airport located in Class B — and under 61.195(d)(3) you may not sign either unless you gave that student ground and flight training in that airspace or at that airport.

• Below 10,000 ft MSL — 250 knots indicated
• At or below 2,500 ft AGL within 4 NM of the primary airport of Class C or Class D — 200 knots indicated. This paragraph does not apply within Class B; those operations comply with the 250-knot rule instead
• In the airspace underlying a Class B area, or in a VFR corridor through it — 200 knots indicated

Teach it as three questions the student asks in order — clearance? two-way? equipment?

• Class B — ATC clearance required (91.131(a)(1)); Mode C transponder and ADS-B Out required in and above the Class B veil (91.215, 91.225)
• Class C — two-way radio communications established with the ATC facility providing services before entry (91.130); Mode C and ADS-B Out required
• Class D — two-way radio communications established with the tower before entry, and maintained thereafter while in the airspace (91.129)
• Class E — no clearance or communication required for VFR; equipment requirements depend on altitude and location (91.215, 91.225)
• Class G — uncontrolled; no ATC service, but 91.126 traffic pattern rules and the CTAF procedures still apply

"Two-way communications established" means the controller responded with your call sign without a restriction — a distinction students must be able to state, because "N123AB, standby" is not establishment.

In level cruising flight more than 3,000 feet above the surface:

• Magnetic course 0° through 179° — odd thousand foot MSL altitude plus 500 feet (3,500, 5,500, 7,500...)
• Magnetic course 180° through 359° — even thousand foot MSL altitude plus 500 feet (4,500, 6,500, 8,500...)

It is magnetic course, not heading, and the rule kicks in at more than 3,000 AGL — two details students get wrong on the ground and in the air.

SUA usually consists of prohibited areas, restricted areas, warning areas, MOAs, alert areas, and controlled firing areas (PHAK ch. 15). Charts show the area name or number, effective altitudes, times and weather conditions of operation, the controlling agency, and the chart panel location.

• Prohibited — flight is prohibited; charted with a "P" and a number (e.g., P-40)
• Restricted — charted with an "R" and a number (e.g., R-4401); details on the back of the chart
• Warning — similar in nature to restricted areas, but the U.S. does not have sole jurisdiction. Defined dimensions extending from 3 NM outward from the coast, containing activity hazardous to nonparticipating aircraft, over domestic or international waters or both; designated "W" and a number (e.g., W-237)
• MOA — defined vertical and lateral limits established to separate certain military training activities from IFR traffic; not numbered (e.g., "Camden Ridge MOA"). Nonparticipating IFR traffic may be cleared through if ATC can provide separation; otherwise ATC reroutes or restricts it. Times, altitudes, and controlling agency are on the back of the sectional
• Alert — charted with an "A" and a number (e.g., A-211) to inform nonparticipating pilots of a high volume of pilot training or unusual aerial activity. All activity must be conducted in accordance with regulations without waiver, and participating and transiting pilots are equally responsible for collision avoidance
• Controlled firing area — activities must be suspended when a spotter aircraft, radar, or ground lookout indicates an aircraft may be approaching. Because a CFA never requires a nonparticipating aircraft to change its flightpath, it is not charted

Beyond SUA, "other airspace areas" includes LAA, military training routes, TFRs, parachute jump operations, published VFR routes, TRSAs, NSAs, and ADIZ areas (PHAK ch. 15). National Security Areas are established where increased security and safety of ground facilities is required; flight may be temporarily prohibited by regulation under part 99 with prohibitions disseminated by NOTAM, and pilots are otherwise requested to voluntarily avoid flying through them (PHAK ch. 15).

• TFR — temporary flight restrictions issued by NOTAM for hazards, disaster relief, VIP movement, or special events. They are pop-up: the fact that you checked yesterday is irrelevant. PHAK ch. 14's pilot-deviation guidance names the pop-up TFR explicitly as a reason to plan every flight, even a familiar one.
• SFRA — special flight rules areas, such as the Washington, DC SFRA, with their own training, equipment, and procedural requirements published in part 93.
• SATR — special air traffic rules, also in part 93.

AI.II.G.S3 requires you to identify the requirements for operating in SUA or within a TFR, and to identify and comply with SATR and SFRA operations, if applicable. Teach the research method — where to look, and how recently — not a list of current restrictions that will be stale by the time your student solos.

The Task lists VFR Navigation Charts as a primary reference, so expect to be handed one. Work the symbology in the order the student's eye moves:

• Class D — blue segmented (dashed) lines, with the ceiling in a dashed box in hundreds of feet MSL (AIM 3-2-5).
• Class E floors — the two vignettes that confuse everyone: magenta vignette = 700 ft AGL floor, blue vignette = 1,200 ft AGL floor (AIM 3-2-6). Teach the fading edge rule: the airspace at the lower floor sits on the soft, faded side of the band.
• Class E surface areas, and where no floor is charted at all — Class E then begins at 14,500 ft MSL (PHAK ch. 15).
• Class B and Class C shelves — annotated as a fraction, ceiling over floor. Every one of those numbers is MSL (AIM 3-2-3, 3-2-4: Class C is charted "4,000 feet above the airport elevation (charted in MSL)"). A student reading a 30/SFC shelf as AGL is the student who busts it.
• SUA boundaries — the hatched-band boundary with the identifier inside: "P" or "R" plus a number, "W" plus a number, and MOAs named rather than numbered; a controlled firing area is not charted at all (PHAK ch. 15).
• TRSA — a solid black line with altitudes for each segment; the Class D portion inside it keeps its blue segmented line (PHAK ch. 15).

Do not lecture the legend. Two exercises that work:

1. Point and name. Put the sectional between you, point at a boundary, and have the student say the class, the floor, the ceiling, and the three questions — clearance, communication, equipment. Then reverse it: name a class and make them find one.
2. Draw a course line through it. Have the student mark every airspace transition along a route and write, at each mark, what changes: the weather minimums, what they must say on the radio, and the altitude that would keep them out of it entirely.

The second exercise is the one that transfers, because it is the form the knowledge takes in flight. A student who can recite the legend but cannot say "at this point I need to be talking to Approach or below 2,600" has not learned the chart yet.

Common errors to name: reading shelf altitudes as AGL, reading the vignette backwards, and assuming the magenta dashed surface area belongs to Class D.

The standard is all available information concerning that flight — 91.103 requires the pilot in command to become familiar with it before beginning the flight. Charts, Chart Supplements, and the AIM have effective dates, and NOTAMs change between them.

The instructor's version of this is a habit you model out loud: state the chart's effective date at the briefing, state where the NOTAMs came from and when you pulled them, and state which items you checked (runway and taxiway closures, TFRs, navaid outages). AI.II.J.R1 makes using expired publications a named risk; this is the routine that prevents it.

Teach the chart, not the table. Sit down with a sectional covering your practice area and work outward:

1. Find the airspace you are in right now. Have the student trace the boundary and read the floor and ceiling off the chart symbology.
2. Ask the three questions in order — clearance, communication, equipment — and have the student answer them from the chart plus the regulation.
3. Then the weather minimums, read from the class they just identified.
4. Then plan a route that crosses three classes and have the student narrate the transitions, including what they will say on the radio and when.

This is guided discussion rather than lecture (AIH ch. 5), and it works because the learner already has the perceptual raw material — they have flown through this airspace — and needs to organize it into insight.

• "I called the tower, so I'm cleared." Class D requires established two-way communications; Class B requires an explicit clearance (91.131(a)(1)). Different words, different meanings.
• "Class B is clear of clouds, so the weather is better there." The cloud clearance is relaxed because ATC provides separation — the visibility requirement is still 3 SM.
• "VFR cruising altitudes are based on my heading." Magnetic course (91.159).
• "Class E starts at 700 or 1,200 feet everywhere." Read the chart; the magenta and blue shading, and the segmented boundaries, mean specific things.
• "An MOA is closed to me." VFR flight is not prohibited in an active MOA, but the caution required is real and the traffic will be fast.

Three distinct failure modes, each with a different fix:

• Unintentional entry — busting a Class B or C shelf, or a restricted area. Fix: plan the route with altitude margins, use flight following, and do not navigate along an airspace boundary. PHAK ch. 14 warns specifically that GPS is usually more precise than ATC radar, so flying up to the line on your GPS can result in a pilot deviation because ATC radar may show you inside.
• Legal entry, inadequate skill — a student who is legally allowed into Class C but cannot manage the radio while flying the airplane. Fix: staged exposure, with you handling the radio the first time and the student narrating.
• Weather squeeze — descending to stay below a shelf and running out of cloud clearance or terrain margin. Fix: teach the decision to turn around as a planned option, not a failure.

Sequence the endorsements to the exposure:

1. Local solo in familiar airspace, with the 61.87 endorsements, renewed every 90 days by an instructor who flew with the student (61.87(n), (p)).
2. 25 NM airport work after training at that airport in both directions over the route, including pattern entries and exits (61.93(b)(1)).
3. Solo cross-country with the category and make-and-model endorsements plus the per-flight planning endorsement, in airspace you have flown with them (61.93(c)).
4. Class B or towered-airport work only after the specific ground and flight training that 61.195(d)(3) requires you to have given before you may endorse it. Track the date: the 61.95 Class B endorsements must be dated within the 90-day period preceding the flight (61.95(a)(2), (b)(2)), so they run on the same 90-day clock as the 61.87 solo endorsement and need re-signing alongside it.

Write the airspace limitation into the endorsement. "Not authorized to operate within the Class B airspace" is a limitation, and 61.195(d)(1) contemplates exactly that kind of constraint.

Teach the recovery, not just the avoidance. If a deviation occurs, notify ATC as soon as possible (PHAK ch. 14). Then debrief it as a learning event: what was the plan, what was the actual position, and which cue was missed.

For prevention, PHAK ch. 14's three steps translate directly into a student briefing: plan each flight even when it is familiar, because conditions change and pop-up TFRs appear; talk and squawk, because flight following makes the controller's job easier by integrating VFR and IFR traffic; and give yourself some room, because your GPS is more precise than the radar that will be used to evaluate you.