Learning to read instrument approach plates is one of the most critical skills you'll develop during your instrument training. An instrument approach plate (also called an approach chart) is essentially your roadmap for safely descending from the clouds to the runway when visibility is low. These charts pack a ton of information into a single page, and understanding how to read them quickly and accurately can make the difference between a smooth landing and a missed approach.
Key Takeaways:
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Instrument approach charts are detailed diagrams published by the FAA that guide pilots from the en route environment down to the runway using only aircraft instruments. Every published instrument approach procedure follows standardized formatting, making it easier for pilots to quickly interpret critical information regardless of which airport they're flying into.
These charts are updated every 56 days through the Terminal Procedures Publication to ensure pilots have access to the most current procedures, altitude restrictions, and navigation system requirements. Whether you're flying a precision approach with vertical guidance or a non-precision approach, the approach plate tells you everything you need to know.
The briefing strip, located at the top of the approach chart, provides essential identification and operational information. It includes the airport name, city and state, approach type, runway, and any applicable procedure notes. This section also contains communication frequencies such as ATIS, clearance delivery, approach, and tower frequencies. Additionally, navigation information is provided, including final approach course, localizer or RNAV frequency, and required navigation equipment or capabilities (such as GPS or WAAS).
The effective date of the chart is shown here, indicating the chart’s validity period. The margin identification code and procedure identifier help pilots quickly locate and verify the correct chart in both paper publications and electronic flight bags
The plan view shows a top-down look at the entire approach course and surrounding area. This is where you'll find the initial approach fix, intermediate fix, and final approach fix marked with their respective symbols.
The plan view also displays:
Altitude restrictions appear throughout the plan view. A mandatory altitude shows as a number with lines above and below it, while minimum altitudes have only a line underneath.
Think of the profile view as looking at the approach from the side. This section breaks down the approach into segments: initial approach segment, intermediate segment, final approach segment, and missed approach segment.
|
Approach Segment |
Purpose |
Key Features |
|
Initial Approach |
Transition from en route to approach |
Begins at initial approach fix, provides obstacle clearance |
|
Intermediate Segment |
Allows configuration and descent |
Established inbound on approach course, reduces altitude |
|
Final Approach Segment |
Descends to landing or decision point |
Starts at final approach fix (FAF), ends at runway threshold or missed approach point |
|
Missed Approach Segment |
Provides escape route if landing isn't possible |
Specific climb instructions and altitude restrictions |
The profile view shows your vertical descent path, including glidepath or step-down fixes, and the location of the missed approach point. However, the decision altitude (DA) for precision approaches and the minimum descent altitude (MDA) for non-precision approaches are not typically depicted in the profile view. These minimums are found in the minimums section of the approach plate.
This section is critical because it tells you the minimum visibility requirements and altitude you can descend to before you must see the runway environment. Landing minimums vary based on your aircraft category (determined by approach speed) and the type of approach.
The minimums section includes:
The airport sketch provides a simplified diagram of the runway layout, taxiways, and important airport features. This helps you orient yourself once you break out of the clouds and see the runway.
The sketch also shows landing distance available and any relevant notes about airport operations. For military airports or airports with special procedures, additional information appears here.
The type of instrument approach procedure you fly significantly affects how you descend and what minimums apply.
|
Approach Type |
Vertical Guidance |
Examples |
Typical Minimums |
|
Precision Approach |
Yes (glideslope) |
ILS, GLS |
200-300 feet AGL |
|
Approach with Vertical Guidance |
Yes(glidepath)) |
LPV, LNAV/VNAV |
200-350 feet AGL |
|
Non Precision Approach |
No |
VOR, LOC, RNAV (LNAV) |
300-500+ feet AGL |
Precision approaches provide both lateral and vertical guidance throughout the final approach segment. The approach lighting system at the runway threshold helps you transition from instruments to visual flight.
Non precision approaches only provide lateral guidance, meaning you're responsible for managing your own descent profile. Barometric vertical navigation (BARO-VNAV) can provide vertical guidance on some RNAV approaches, but it's not the same as a true precision approach.
Pro Tip: Always brief the missed approach procedure before starting your approach. When things go wrong in low visibility, you won't have time to figure it out. Know your missed approach icons and climb instructions cold.
When you fly instrument approaches, understanding altitude restrictions is critical for safety and obstacle clearance. The plan view uses standardized symbology to show mandatory altitudes, minimum altitudes, and maximum altitudes.
The total system error accounts for various navigation errors, which is why altitude restrictions include built-in buffers. This gives you margin to safely clear obstacles even if your navigation system isn't perfect.
Air traffic control will issue your approach clearance, which typically includes the approach type, runway, and transition. Procedure entry methods vary based on where you're coming from and which initial approach fix you'll use.
Some approaches require a procedure turn to reverse course and align with the final approach course. Others use holding patterns or arcing turns for procedure entry.
The briefing strip and notes box clearly state what navigation equipment is required. Some approaches need DME, while others work with basic GPS or area navigation (RNAV) systems.
Equipment requirements ensure you have the necessary tools to safely fly the approach procedure. The notes box also highlights any non-standard features like unusual approach speeds or specific aircraft operating limitations.
When you fly instrument approaches in the terminal environment, you might encounter several approach variations to the same runway. An airport might have an ILS, RNAV, and VOR approach all serving the same runway.
Each instrument approach procedure has different minimums based on the precision of the navigation system. This is why airports publish multiple approaches, giving pilots options based on their equipment and weather conditions.
A straight in approach means you can land directly from your final approach course. Circling minimums apply when the instrument approach does not line up with the runway you intend to land on. After breaking out of the clouds, you must maneuver visually to align with the landing runway.
Not all runways have the same types of instrument approaches. Sometimes a runway may not have a published approach at all. In those cases, you may fly an approach to a different runway and then circle to land on the runway that is better aligned with the wind or operational needs.
Because circling requires additional maneuvering at low altitude, circling minimums are always higher than straight in minimums. They provide extra altitude and visibility to safely maintain visual contact with the runway while turning and positioning for landing.
Pro Tip: When circling, you must remain within the protected circling area and keep the runway environment in sight at all times. If you lose visual reference, you must execute the missed approach procedure.
Reading instrument approach charts effectively takes practice and repetition. During your instrument training, you'll spend significant time learning to interpret these charts quickly and accurately.
The best pilots mentally fly the entire approach procedure during their briefing. They visualize each segment, know their target airspeeds, and have a clear picture of what to expect at each fix.
Pro Tip: Create a standardized briefing format and use it every single time. Consistency builds habit patterns that keep you safe when workload gets high or weather gets challenging.
Even experienced pilots can make errors when interpreting approach charts. Here are mistakes to avoid:
Misreading minimum altitudes: Confusing mandatory altitudes with minimum altitudes can lead to premature descents. Always double-check the symbology.
Forgetting aircraft category: Using the wrong category minimums for your approach speed can put you below safe altitudes. Know your category before you start (Vref or 1.3 x Vso).
Skipping the missed approach brief: Many pilots focus only on flying the approach and neglect to brief the missed approach procedure. This creates dangerous delays if you need to execute a go-around.
Ignoring notes and restrictions: The notes box contains critical information about non standard procedures, altitude restrictions, and special requirements. Always read it during your brief.
Mastering instrument approach procedures is essential whether you're pursuing airplane pilot training or helicopter instrument training. Every professional pilot career requires strong instrument skills.
Airlines and commercial operators expect pilots to interpret approach charts quickly and fly approaches precisely. Your ability to brief, fly, and execute approach procedures demonstrates your overall airmanship and attention to detail.
Understanding approach plates also helps you make better decisions about weather, alternate airports, and fuel planning. These charts tell you what's possible at each airport and what conditions you need to legally complete an approach.
At Hillsboro Aero Academy, instrument training focuses heavily on practical application. Our instructors ensure you can not only read approach charts but also brief them thoroughly and fly them precisely.
We train in Oregon's diverse weather conditions, giving you real-world instrument experience. You'll fly both precision approaches and non-precision approaches to various airports, building the confidence that comes from hands-on practice.
Our comprehensive airplane courses include extensive ground school on approach plate interpretation, followed by simulator and aircraft training. This progression ensures you understand the theory before applying it in flight.
Understanding instrument approach plates is just one piece of earning your instrument rating. You'll also learn radio navigation, IFR flight planning, weather theory, and much more.
The key is starting with a solid foundation in chart reading. Once you can quickly interpret approach plates, the actual flying becomes much easier because you know exactly what to expect.
Ready to begin your journey toward becoming an instrument-rated pilot? Our team at Hillsboro Aero Academy is here to guide you through every step of the process.
These terms are interchangeable. Both refer to the same document that provides detailed information for flying instrument approach procedures. Pilots and aviation professionals use both terms regularly, though "approach plate" is slightly more common in everyday conversation.
The FAA publishes updated instrument approach charts every 56 days through the Terminal Procedures Publication. This regular cycle ensures pilots have access to current procedures, including any changes to existing procedures, altitude restrictions, or equipment requirements. Always check that your charts are current before flying.
Flying instrument approaches means descending from cruise altitude to the runway using only your aircraft instruments and published approach procedures, without visual reference to the ground. This skill is essential for operating in low visibility conditions and is required for pilots who want to fly professionally or in weather below visual flight rules.
Missed approach icons are symbols on the approach plate that show the specific path and instructions for the missed approach procedure. They're critical because they tell you exactly what to do if you can't land, including heading, altitude, and navigation requirements. Knowing these before starting your approach is a safety essential.
Altitude restrictions tell pilots the specific altitudes they must maintain at various points during the approach procedure. A mandatory altitude has lines both above and below the number, meaning you must cross at exactly that altitude. Minimum altitudes show only a line below, meaning you must be at or above that altitude.
The final approach fix (FAF) marks the beginning of the final approach segment where you start your descent toward the runway. The missed approach point marks the end of the final approach segment, where you must either have the runway in sight to land or execute the missed approach procedure.
Yes, different instrument approach procedures require specific navigation equipment. Some approaches need DME, others require GPS or area navigation systems, and precision approaches may need ILS receivers. The approach plate clearly states all equipment requirements in the briefing strip and notes section.
Non-standard alternate minimums are higher weather requirements than the standard minimums for using an airport as an alternate destination. These appear in the approach plate notes box and typically apply to airports with challenging terrain, limited navigation aids, or other factors that require extra weather buffers for safety.
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