Understanding IFR Approach Procedures

For flight sim enthusiasts, mastering Instrument Flight Rules (IFR) approach procedures is one of the most rewarding challenges. When visibility drops, clouds close in, or night flying turns the world into a black void, your ability to fly solely by reference to instruments separates the casual sim pilot from the serious aviator. IFR approaches are standardized, published procedures that guide an aircraft from the en‑route structure to a point where the runway is in sight, enabling a safe landing. This guide provides a comprehensive, step‑by‑step approach to executing these procedures within your flight simulation environment, combining real‑world techniques with simulation‑specific tips.

What Is an IFR Approach?

An IFR approach is a predefined flight path that uses ground‑based or satellite‑based navigation aids to bring an aircraft safely from the last en‑route fix (or from a holding pattern) to a position where a landing can be made. The key is that during most of the approach, the pilot has no visual reference to the ground. Instead, they rely on instruments such as the localizer, glide slope, VOR bearing, or GPS course deviation. Approaches are classified by the navigation system used: ILS (Instrument Landing System), VOR (VHF Omnidirectional Range), NDB (Non‑Directional Beacon), and GPS/RNAV (Area Navigation) including RNP (Required Navigation Performance). Each type has its own procedures, minima, and charts.

Pre‑Approach Planning: The Foundation of Success

Before you even start the engines, thorough planning is essential. In a flight sim environment, you have the luxury of pausing and reviewing charts, but in practice, this preparation should be completed on the ground. The following steps will set you up for a smooth execution.

Gather and Review Approach Charts

Modern flight sims integrate Navigraph or Jeppesen charts, or you can download free PDFs from sources like FAA’s digital‑terminal procedures page. For each approach, study the plan view, profile view, and minimums section. Identify the Initial Approach Fix (IAF), the Intermediate Fix (IF), the Final Approach Fix (FAF), and the Missed Approach Point (MAP). Note the frequencies for localizer, glide slope, VOR, or NDB. Write down the final approach course inbound heading and the altitude constraints at each fix.

Check Weather and NOTAMs

Set realistic weather using built‑in sim weather engines or add‑ons like Active Sky. Simulate low ceilings and reduced visibility to practice real IFR conditions. Check METAR and TAF for your destination—even in a sim, this builds good habits. Also review NOTAMs (Notice to Air Missions) for navaid outages or airspace restrictions. Many sim databases include these, but you can also check Leidos Flight Service for realism.

Configure Your Avionics and Autopilot

Set up your navigation radios, GPS, and autopilot before departure or during cruise. For an ILS approach, tune the localizer frequency (e.g., 110.30) and identify the Morse code. For VOR approaches, set the VOR frequency and OBS (Omni Bearing Selector) to the inbound course. For GPS approaches, ensure your flight plan is loaded with the correct waypoints and that the approach procedure is activated. Configure the autopilot to capture the localizer and glide slope when the time comes. In many aircraft, this means arming approach mode (APR) on the autopilot panel.

Brief the Approach

Give yourself a mental briefing. Say out loud: “We are on the VOR‑A approach to Runway 27. Initial approach fix is OAK, altitude 3000 feet. After OAK, proceed to the procedure turn outbound on the 090 radial for one minute, then turn left inbound. Final approach fix is at 5.5 DME from OAK; minimum descent altitude is 500 feet. Missed approach: climbing left turn to 3000 feet direct OAK VOR.” This verbal rehearsal locks the sequence into memory.

Executing the IFR Approach: Step by Step

Once you are in the air and have received an approach clearance from ATC (in simulations like VATSIM or PilotEdge, or simply self‑clearance when offline), the real work begins. Below is a detailed walkthrough for a typical ILS approach, the most common and precise non‑precision approach.

Step 1: Transition from En‑Route to Approach Phase

As you near the destination, begin slowing to approach speed. Configure flaps and landing gear according to your aircraft’s checklist. Contact the approach controller (or simulate the radio calls) and request clearance for the ILS runway. Receive your instructions: “Cleared for the ILS Runway 27 approach. Maintain 3000 feet until established on the localizer.” Set the heading bug to the intercept heading for the localizer (usually 30° to the inbound course).

Step 2: Intercept the Localizer

Fly to the Initial Approach Fix (IAF) at the assigned altitude. Once there, turn to an intercept heading. For an ILS, the localizer course is shown on the chart. If the inbound course is 268°, and you are approaching from the side, fly a heading of 298° (30° intercept) until the localizer needle begins to move. As it centers, turn to the inbound course. Use the autopilot’s HDG mode or fly manually. Ensure the NAV mode is armed to capture the localizer.

Step 3: Intercept the Glide Slope

Remain at the assigned altitude until the glide slope needle (usually a magenta diamond on the PFD or a separate instrument) begins to descend from the top of the scale. When it reaches the center, reduce power and lower the nose to follow the glide slope. Using the autopilot’s APR mode will cause the aircraft to automatically capture both the localizer and the glide slope. Monitor your vertical speed—typically 600–800 fpm on a 3° glide slope at 140 knots groundspeed.

Step 4: Fly the Final Approach

Keep the localizer needle centered. Make small corrections: if it drifts left, correct 5° to the right, then recenter. For glide slope, adjust power. If above the glide slope, reduce power slightly; if below, add power. Maintain your approach speed (Vref + wind correction). Cross the Final Approach Fix (FAF) at the published altitude and note the time to the MAP (usually 2–5 minutes). Listen for the runway environment: lights, approach lighting system, or the runway itself at Decision Height (DH) or Minimum Descent Altitude (MDA).

Step 5: The Decision Point

If at DH (for ILS) or MDA (for non‑precision) you have the required visual reference (runway, approach lights, or threshold), you may land. Otherwise, execute the missed approach procedure immediately: full power, pitch up, retract flaps and gear as per aircraft type, and follow the published missed approach route (climb to 2000 feet direct to the VOR, then hold, etc.). In a sim, practice both landing and missed approach to build instinct.

Types of IFR Approaches and Their Nuances

Not every airport has an ILS. VOR, NDB, and GPS approaches each have quirks that demand different flying techniques.

VOR Approaches

VOR approaches use radial tracking without a glide slope. You fly to the VOR station on a specified radial, then descend in steps using DME arcs or timed legs. The minimums are usually higher. Fly a stabilized descent to the MDA, then look for the runway. Use the VOR needle to track the published inbound course. A common mistake is forgetting to set the OBS to the inbound radial: always verify you are flying the correct “TO/FROM” indication.

NDB Approaches

NDB approaches are rare in modern IFR but still appear in some regions and in simulated retro aircraft (like the DC‑3). The ADF needle always points to the station. To track a bearing, you must apply a wind correction angle (the “bracket” technique). The lack of a linear deviation display makes NDB approaches more mental and less precise. Practice holding a heading while compensating for drift until the ADF needle remains on the nose.

GPS / RNAV Approaches

GPS approaches are the future and common in many flight sims. They use waypoints defined by latitude/longitude to create a three‑dimensional path. LPV (Localizer Performance with Vertical guidance) approaches give glide path guidance similar to ILS, with lower minimums. GPS approaches require loading the procedure into the flight plan, activating the approach mode, and following the flight director or autopilot. Cross‑check with raw data: you can still see your bearing and altitude deviation on the map or instrument. Note that GPS approaches may have a “step‑down fix” where you must descend in two stages.

Chart Symbology and Reading

Every approach chart has a “procedures” section. Familiarize yourself with symbols: the Maltese cross for missed approach point, the lightning bolt for lighting, the shaded area for plan view, the profile view with altitudes and distances. Pay attention to “straight‑in” vs. “circling” approach categories. In a sim, you can use iPad apps like ForeFlight (with a subscription) or free PDFs to learn.

Common Pitfalls and How to Avoid Them

Even experienced sim pilots stumble. Here are frequent errors and fixes:

  • Descending before being established: Wait until the localizer is within one dot and the glide slope needle is alive before leaving the assigned altitude.
  • Chasing the needles: Instead of large corrections, use standard 5° heading changes and small power adjustments. Overcorrecting leads to oscillations.
  • Forgetting to switch from MAP to Approach mode: In aircraft like the G1000 or Boeing MCP, you must arm APP (approach) mode, not NAV. Check your avionics manual.
  • Ignoring crosswind: Even on an ILS, you need to bank into the wind to keep the localizer centered. Use crabbing until just before flare.
  • Not briefing the missed approach: Without a plan, the shock of a go‑around leads to confusion. Have the missed approach procedure loaded in your brain and flying the correct heading/altitude.
  • Using autopilot without monitoring: Autopilot may disconnect unexpectedly. Keep your hand on the yoke and eyes scanning.

Tools and Add‑Ons to Enhance IFR Practice

Your flight sim can be more than a game. Use these resources to build real skills:

  • Navigraph – Current charts, navigation databases, and FMS data for all major sim platforms.
  • PilotEdge – Professional ATC simulation with real‑world controllers and IFR clearances, perfect for practicing approaches.
  • AVSIM – Community forums with freeware charts, tutorials, and aircraft specific IFR checklists.
  • Sim add‑on aircraft with detailed systems: PMDG, A2A, FlightFactor, or even Zibo 737. The more realistic the avionics, the better the practice.
  • Record your flights using built‑in replay or external tools like Flight Recorder to review your approach path and identify mistakes.

Conclusion

IFR approach procedures are the heart of instrument flying. In a flight simulation, you have a risk‑free environment to build the muscle memory and mental discipline required for precision approaches. Start with simple VOR or GPS approaches, then progress to ILS in low‑visibility conditions. Use the step‑by‑step method above—plan, brief, intercept, capture, decide—and soon you will be shooting approaches with the same confidence as a real‑world instrument pilot. Keep the weather challenging, the charts updated, and your patience fresh. The runway will appear, and the satisfaction of a perfect instrument approach is one of the greatest rewards in virtual aviation.