Approach Category – Aviation Glossary

Definition and Regulatory Foundation

Approach category is a regulatory classification that groups aircraft by their approach speed—specifically, the reference landing speed (VREF) or 1.3 times the stalling speed in landing configuration (VSO)—measured at the aircraft’s maximum certificated landing weight. This classification is codified in international and national regulations, including ICAO Doc 8168, 14 CFR 97.3, and FAA Advisory Circulars. The approach category is a permanent certification feature of each aircraft and is not variable based on actual landing weight, actual approach speed, or operational conditions.

All instrument approach procedures (IAPs) and approach charts use approach categories to define the applicable minima for decision altitude (DA), minimum descent altitude (MDA), and visibility. These minima ensure obstacle clearance and safe maneuvering by accounting for the different speeds, turn radii, and performance characteristics of each category.

Technical Parameters: VREF, VSO, and Maximum Certificated Landing Weight

• VREF: The reference landing speed established by the manufacturer, generally 1.3 × VSO, at maximum certificated landing weight.
• VSO: Stalling speed in landing configuration at maximum certificated landing weight.
• Maximum Certificated Landing Weight: The highest landing weight authorized by the aircraft’s certification, documented in the AFM or POH.

The approach category is calculated using these parameters and does not change unless the aircraft’s maximum certificated landing weight is officially amended.

Approach Category Table

Determination and Permanence of Approach Category

The approach category is fixed at certification and recorded in the aircraft’s documentation. It is not affected by actual in-flight weight, modifications, or the speed flown on a given approach—except when the aircraft’s maximum certificated landing weight is formally revised by the manufacturer and regulatory authority.

Key points:

• You may not use a lower category based on lighter weight or slower approach.
• You must use higher minima if flying above certified category speed.
• Legal reduction requires formal regulatory approval and documentation.

Application in Instrument Approach Procedures (IAPs)

All IAPs provide minima for each approach category. These minima are based on the maneuvering speeds and turn radii of aircraft within each category. Pilots must use the minima for their certified approach category, or the next higher if operational speed exceeds their category’s upper limit.

Example

A Challenger 350 (Category C, VREF 137 knots) must use Category C minima. If operationally forced to fly at 145 knots (above C limit), the pilot must use Category D minima.

Circling Approach and Protected Areas

Circling approaches require lateral maneuvering to a runway not aligned with the approach course. The circling protected area is determined by the approach category, providing obstacle clearance based on the maximum allowed speed for each category.

Exceeding speed or using lower minima risks exiting the protected area and losing obstacle clearance.

Use of Higher Approach Category Minima

If operational needs require flying at a higher speed than your category’s limit, you must use the next higher category minima. If those minima are not published, exercise extra caution and ensure maneuvering remains within the appropriate protected area.

Considerations:

• High winds or abnormal configurations may force higher speeds.
• Shallower bank angles and higher groundspeed increase turn radius.
• Always brief and plan for the correct category, especially in circling scenarios.

Legal Reduction of Approach Category

To legally lower an aircraft’s approach category, the manufacturer must issue a service bulletin reducing the maximum certificated landing weight, and the regulatory authority must approve this change. Once documented, the approach category is recalculated, and the aircraft may use the lower minima.

Example:
A Gulfstream G450 with a reduced max landing weight, after regulatory approval and documentation update, changes from Category D to C.

Operational Best Practices

• Incorporate approach category requirements into SOPs.
• Require approach minima briefing based on certified category.
• Train for scenarios requiring higher category minima or circling approaches.
• Monitor for compliance as part of your SMS.

Case Studies

Circling Approach Above Certified Speed

Aircraft: Embraer Legacy 600 (Category C)
Scenario: Icing requires 145 knots circling speed.
Action: Use Category D minima and ensure maneuvering remains within the 2.3 NM radius.

SOP/SMS Implementation

Operator: Mixed-fleet business jet company
Practice: All approaches briefed for certified category; SMS tracks approaches exceeding certified speed.

Legal Category Change

Aircraft: Gulfstream G450
Modification: Reduced max landing weight.
Result: Official change to Category C, authorized to use lower minima.

Summary Table

Glossary Cross-References

• Maximum Certificated Landing Weight: The highest landing weight authorized, used for approach category assignment.
• VREF: Reference landing speed at max landing weight.
• VSO: Stalling speed in landing configuration at max landing weight.
• Instrument Approach Procedure (IAP): Published procedure for instrument approaches, with minima by approach category.

For full regulatory details, refer to:

• 14 CFR 97.3 (FAA)
• ICAO Doc 8168 (PANS-OPS)
• FAA InFO 23001
• Aircraft Flight Manual (AFM) or Pilot Operating Handbook (POH)

Understanding and applying approach category correctly is vital for safe, compliant, and efficient instrument flight operations.