What is the standard layout of an instrument approach procedure chart?

FAA instrument approach procedure charts, published by the National Aeronautical Charting Office (NACO/government) or Jeppesen, follow a standardized top-to-bottom format that includes a plan view (overhead depiction of the approach course, fixes, and airspace), a profile view (vertical path of the approach), and a minimums section listing decision altitude/height or minimum descent altitude for each aircraft category. A briefing strip at the top of the chart contains the airport name, approach type, frequency data, and final approach course. The PHAK and Instrument Flying Handbook (IFH) both emphasize that familiarity with this consistent layout allows pilots to rapidly brief any approach without missing critical data.

How do you read the minimums section on an instrument approach procedure chart?

The minimums section is organized by aircraft approach category (A through D, based on 1.3 times the aircraft's stall speed in landing configuration), and lists the ceiling and visibility required to continue an approach to landing. For precision and precision-like approaches you will see a Decision Altitude/Height (DA/DH), while non-precision approaches list a Minimum Descent Altitude (MDA) and required visibility in statute miles or runway visual range (RVR) in hundreds of feet. Alternate minimums, if non-standard, are flagged with a triangle-A symbol in the chart's briefing strip, directing you to consult the alternate minimums section of the TPP for that airport, per 14 CFR Part 91 and the AIM.

What's the difference between the plan view and the profile view on an approach chart?

The plan view is the bird's-eye depiction of the approach, showing the intermediate and final approach segments, holding patterns, feeder routes, fixes, and the minimum safe altitude (MSA) circle — giving you a horizontal picture of how to navigate to the runway. The profile view, directly below the plan view, shows the vertical dimension of the approach, including step-down fixes, the glideslope or visual descent point (VDP), threshold crossing height (TCH), and the final approach fix (FAF) depicted with a Maltese cross symbol on non-precision approaches. Together, these two views allow instrument pilots to visualize both the lateral and vertical flight path required to comply with the procedure, as described in the Instrument Flying Handbook.

IAP Chart Layout and Symbology Overview

Every instrument approach procedure (IAP) chart is a carefully organized document that translates a complex set of government-defined procedures into a readable, briefable format you can use in the cockpit. Whether you are flying an ILS into a major hub or a GPS approach into a remote strip, the chart follows the same standardized layout published by the FAA and NACO (National Aeronautical Charting Office). Learning to read that layout fluently is not just an exam skill — it is a fundamental instrument-pilot survival skill.

This article walks through every major section of the standard U.S. government IAP chart, explains what each piece of data means, and highlights the symbology that trips up students on the Instrument Rating knowledge test and on checkrides alike.

The Five Major Sections of an IAP Chart

FAA instrument approach charts are organized into five horizontal bands or regions, each serving a specific briefing purpose. From top to bottom they are: the header/identification section, the pilot briefing section, the plan view, the profile view, and the minimums section (sometimes called the landing minimums section). Understanding what lives in each band keeps your scan organized under workload.

Header and Identification Section

The very top of the chart contains the approach name, the airport name and location, and the chart's effective date and amendment cycle. The approach name tells you everything about the procedure type at a glance. For example, ILS OR LOC RWY 28L tells you the chart covers both the full ILS and the localizer-only approach to Runway 28 Left. RNAV (GPS) RWY 12 tells you it is an area-navigation approach that requires GPS. The amendment number (e.g., AL-146 or 14-1) lets you verify the chart is current — using an expired chart is not only dangerous but is a regulatory concern under instrument flight rules.

Pilot Briefing Section

Just below the header sits a dense strip of critical pre-approach information. This is the first place to look when briefing an approach, and it contains:

Communication frequencies — ATIS, approach control, tower, ground, and CTAF frequencies, usually listed in the order you will use them.
Airport elevation — published in mean sea level (MSL) feet.
Transition altitude/level — not always present, but important for high-altitude operations.
Procedure notes — mandatory notes like Procedure NA at night or DME required appear here in plain language. These are NOT optional. If a note says the procedure is not authorized (NA) without a specific piece of equipment, flying it without that equipment is a regulatory violation.
NAVAID identifiers and frequencies — for ILS approaches, the localizer frequency, course, and identifier (e.g., I-JFK); for VOR approaches, the VOR identifier and frequency.

The Plan View

The plan view is the top-down map of the approach. It shows the geographic context of the procedure and is drawn to a scale that fits all the relevant structure. Key elements include:

Feeder routes and transitions — thin lines with arrows and altitudes showing how to get from the en-route structure into the initial approach fix (IAF). Altitudes on these routes are the minimum altitudes unless otherwise noted.
The initial approach fix (IAF) — marked with the fix name inside a box or with a bold symbol. This is where the published procedure begins.
The intermediate fix (IF) — the point at which you establish yourself on the final approach course and configure for landing. On many charts the IF and the final approach fix are combined.
The final approach fix (FAF) — on precision approaches (ILS, LPV) the FAF is the point where the glideslope is intercepted and is marked with a lightning-bolt symbol (sometimes called the Maltese cross). On non-precision approaches the FAF is marked with a cross (✕).
Missed approach point (MAP) — the location where you must execute the missed approach if the runway environment is not in sight. On non-precision approaches this is typically a DME fix, a timing point, or a waypoint; on precision approaches it is the decision altitude itself.
Holding patterns — racetrack symbols show published holds for course reversals or missed approach procedures.
Obstacle and terrain symbology — spot elevations, terrain shading, and the maximum elevation figure (MEF) in quadrants help you understand the terrain environment. Obstacle icons (towers, antennas) appear with their height in MSL.
The procedure turn or HILPT — when a course reversal is required, you will see either a barbed procedure turn symbol or a holding-in-lieu-of-procedure-turn (HILPT) racetrack with the NoPT note indicating when it is not required.

The plan view also contains a magnetic north arrow and a scale bar, though the scale can vary chart to chart, so never use it to estimate precise distances without checking the scale.

The Profile View

The profile view is the side-elevation diagram beneath the plan view. It shows what the approach looks like from the side — altitudes, descent rates, and the sequence of fixes from the FAF to the runway. This is where many students spend the most study time, because it directly drives cockpit altitude management.

Segment altitudes — each segment (initial, intermediate, final) has a charted minimum altitude. On the final segment of a non-precision approach the altitude is a minimum descent altitude (MDA), depicted as a bold dashed line. You descend to MDA and fly level until you see the runway or reach the MAP.
The glideslope (precision approaches) — shown as a sloping line from the FAF down to the runway threshold. The angle (typically 3.00°) is printed on the chart. The glideslope drives you to the decision altitude (DA) — the point at which you must either land or execute the missed approach.
TCH (threshold crossing height) — the charted height in feet AGL at which the glideslope crosses the runway threshold, typically 50–55 feet for ILS approaches.
Touchdown zone elevation (TDZE) — the highest elevation in the first 3,000 feet of the landing surface, used as the reference for computing DA and MDA in AGL terms.
Visual descent point (VDP) — on some non-precision approaches, a VDP is charted (marked with a V) — it is the point from which a stabilized visual descent to the runway can be made at a normal angle. Descending before the VDP is inadvisable.

The Minimums Section

The minimums section at the bottom of the chart is the most test-intensive part. It lists visibility and altitude minimums organized by aircraft category (A, B, C, D) and by the type of approach being flown. Aircraft approach categories are determined by 1.3 times the aircraft's stall speed in the landing configuration (Vso) at maximum certificated gross weight. Category A is up to 90 knots; Category B is 91–120 knots; Category C is 121–140 knots; Category D is 141–165 knots.

S-ILS 28L — straight-in ILS minimums (with glideslope). Expressed as a DA and visibility (e.g., DA 200, RVR 24).
S-LOC 28L — localizer-only (no glideslope). Expressed as an MDA and visibility, and always higher than the ILS minimums.
CIRCLING — minimums for circling to a different runway. These are always higher than straight-in minimums and apply to the entire airport environment.
RVR vs. statute miles — approach visibility may be expressed in runway visual range (RVR, in hundreds of feet) or statute miles. RVR 24 equals 2,400 feet; RVR 18 equals 1,800 feet. When the relevant RVR is inoperative or unavailable, a conversion table in the AIM allows you to substitute a ground visibility in statute miles.
Alternate minimums — a bold A in a triangle at the top of the chart means non-standard alternate minimums apply; a bold NA means the airport is not authorized as an alternate under IFR.

Why It Matters

Misreading an IAP chart has been a contributing factor in numerous approach accidents. Flying to an MDA when a DA was required (or vice versa), missing a Procedure NA note, or confusing the FAF altitude with the MDA can all be fatal. The standardized layout exists so that a well-trained pilot can rapidly and reliably extract the information needed under high workload, in IMC, possibly fatigued, possibly in a single-pilot operation. Speed in briefing comes from pattern recognition — knowing exactly where each data element lives on every chart.

Key Numbers and Rules

Aircraft approach Category A: Vref up to 90 knots (1.3 × Vso ≤ 90 kt).
Decision Altitude (DA) — used for precision approaches and LPV; you must initiate the missed approach at the DA if the runway environment is not in sight.
Minimum Descent Altitude (MDA) — used for non-precision approaches; you may not descend below MDA unless in a position to land and the runway environment is in sight.
Standard ILS glideslope angle: typically 3.00°, providing approximately 300 feet per nautical mile of descent.
VDP: not all non-precision approaches have a charted VDP; its absence does not mean early descent is permitted.
Circling minimums apply to the approach category of the aircraft — flying faster than your category's speed during circling is not permitted.
An alternate minimums triangle-A symbol means you must look up non-standard alternate minimums in the front of the approach chart booklet before filing that airport as an alternate.

Common Test Traps

DA vs. MDA confusion: The FAA test frequently asks you to identify the correct minimum for a given approach type. Remember: precision approaches (ILS, LPV, GLS) use a DA; non-precision approaches use an MDA. You cannot level off at a DA — you either land or miss.
The FAF symbol: Students confuse the lightning-bolt symbol (precision FAF, where glideslope is captured) with the Maltese cross (non-precision FAF). Each marks a distinctly different type of descent initiation.
Procedure notes are mandatory: Notes like DME required or Procedure NA at night are regulatory, not advisory. Many students treat them as informational only.
RVR conversion errors: RVR is measured in feet; visibility minimums in statute miles. A common trap is treating RVR 24 as 24 statute miles rather than 2,400 feet (about one-half statute mile).
Circling category speeds: You must fly within your aircraft's approach category speed range during circling. Exceeding that speed places you in a higher category with higher minimums — you cannot simply choose the lower category's minimums.