Holding Entry Calculator
Your essential tool for determining the correct IFR holding pattern entry procedure.
Enter the inbound course to the holding fix, from 0 to 359 degrees.
Enter your aircraft’s current magnetic heading as you approach the fix.
Select standard right turns or non-standard left turns.
Recommended Entry Procedure
What is a holding entry calculator?
A holding entry calculator is a specialized aviation tool used by pilots flying under Instrument Flight Rules (IFR) to quickly and accurately determine the correct method for entering a holding pattern. A holding pattern is a predetermined maneuver designed to keep an aircraft within a specific airspace while awaiting further clearance from Air Traffic Control (ATC). Choosing the correct entry is critical for maintaining situational awareness and ensuring separation from other aircraft. This calculator automates the decision-making process for the three standard entry types: Direct, Parallel, and Teardrop.
holding entry calculator Formula and Explanation
The logic for determining the correct holding entry is based on the relationship between the aircraft’s heading and the inbound holding course. The airspace around the holding fix is divided into three sectors. The entry procedure is determined by which sector the aircraft approaches the fix from.
For a standard (right-turn) pattern:
- Direct Entry Sector: A 180° arc on the holding side.
- Parallel Entry Sector: A 110° arc on the non-holding side.
- Teardrop Entry Sector: A 70° arc on the non-holding side.
The calculation involves normalizing the angles and determining which predefined sector the aircraft’s heading falls into relative to the inbound course.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Inbound Holding Course | The magnetic course the pilot flies towards the holding fix on the inbound leg. | Degrees (°) | 0-359 |
| Aircraft Heading | The direction the aircraft’s nose is pointing as it approaches the fix. | Degrees (°) | 0-359 |
| Turn Direction | The direction of turns within the hold (Standard = Right, Non-Standard = Left). | Direction | Right / Left |
| Outbound Course | The reciprocal of the inbound course, flown away from the fix. | Degrees (°) | 0-359 |
Practical Examples
Example 1: Parallel Entry
- Inputs:
- Inbound Holding Course: 180°
- Aircraft Heading: 300°
- Turn Direction: Standard (Right)
- Results:
- Entry Procedure: Parallel Entry
- Instructions: On reaching the fix, turn left to a heading of 360° to parallel the course. Fly for one minute, then make a left turn of more than 180° to intercept the 180° inbound course.
Example 2: Teardrop Entry
- Inputs:
- Inbound Holding Course: 090°
- Aircraft Heading: 230°
- Turn Direction: Standard (Right)
- Results:
- Entry Procedure: Teardrop Entry
- Instructions: On reaching the fix, turn right to a heading of 240° (30° offset from the outbound course). Fly for one minute, then make a right turn to intercept the 090° inbound course.
How to Use This holding entry calculator
- Enter Inbound Course: Input the inbound holding course or radial assigned by ATC in the “Inbound Holding Course” field.
- Enter Aircraft Heading: Input your current magnetic heading as you approach the fix.
- Select Turn Direction: Choose “Standard (Right Turns)” or “Non-Standard (Left Turns)” based on ATC instructions or the published procedure.
- Review Results: The calculator instantly displays the correct entry type (Direct, Parallel, or Teardrop), along with a summary of the steps to fly the entry.
- Visualize the Entry: The dynamic chart below the results provides a visual diagram of the holding pattern and your aircraft’s entry path, enhancing situational awareness. You may find more information about IFR training here.
Key Factors That Affect holding entry calculator
- Wind Correction: The calculator provides the ideal no-wind entry. In practice, pilots must apply wind correction angles to maintain the desired ground track. For more on this, consider a wind correction guide.
- Turn Direction: Non-standard (left turn) patterns are a mirror image of standard patterns. This calculator handles both automatically.
- Timing: Outbound legs are typically flown for one minute (at or below 14,000 ft MSL). This timing starts once the aircraft is abeam the fix or has completed the outbound turn.
- Altitude: Leg timing increases to one and a half minutes above 14,000 ft MSL.
- Fix Type: The holding fix can be a VOR, NDB, RNAV waypoint, or DME fix. The entry procedure remains the same regardless of the fix type.
- Airspeed: Pilots must slow to the maximum holding speed appropriate for the altitude within 3 minutes of reaching the fix.
Frequently Asked Questions (FAQ)
- What are the three types of holding entries?
- The three standard entries are Direct, Parallel, and Teardrop. The correct one depends on the angle of approach to the holding fix.
- What is a standard vs. non-standard holding pattern?
- A standard pattern uses right-hand turns. A non-standard pattern uses left-hand turns and is explicitly assigned by ATC or published.
- What if my heading is on the line between two entry sectors?
- The FAA allows a 5-degree buffer zone. If you fall within this zone, you can choose the entry for either sector.
- How does a holding entry calculator help?
- It reduces pilot workload and eliminates ambiguity during a critical phase of flight, allowing pilots to focus on flying the aircraft. Using a holding pattern calculator can improve safety.
- What is the “thumb method”?
- It’s a manual technique using your thumb against a heading indicator to approximate the 70° teardrop sector and determine the entry. This calculator provides a more precise digital solution. For more details on this, you can visit a flight blog.
- When does timing begin on the outbound leg?
- Timing starts when the aircraft is “abeam” the holding fix on the outbound leg. If the abeam point cannot be determined, timing starts upon completion of the turn to the outbound heading.
- Do I need to correct for wind?
- Yes. You must adjust your heading on the inbound and outbound legs to maintain the correct ground track. A common technique is to triple the inbound wind correction angle on the outbound leg.
- Are there automated systems for holding?
- Yes, modern Flight Management Systems (FMS) can fly holding patterns automatically. However, pilots must still know how to enter the correct parameters and manually fly the procedure as a backup.
Related Tools and Internal Resources
For more advanced flight planning, consider these resources:
- Holding Procedures (FAA AIM 5-3-8): The official source for holding pattern regulations.
- E6BX Holding Calculator: Another excellent tool for visualizing holding patterns.
- Gleim Instrument Pilot Ground School: Comprehensive IFR training materials.
- Pilot’s Cafe IFR Review: Quick reference sheets for instrument procedures.
- Sporty’s Instrument Rating Course: A popular video-based training course.
- King Schools Instrument Rating Course: Another industry leader in flight training.