Last month, we gave you a survey course on what happens behind the scenes of approach procedures (“TERPS 101”). That’s a prerequisite for this course, since we’re going to build on what was covered in that article to examine the nuts and bolts of other types of procedures. In case you didn’t complete the prerequisite, let’s quickly go over what you need to know.
TERPS 201
Last month, we gave you a survey course on what happens behind the scenes of approach procedures (TERPS 101). Thats a prerequisite for this course, since were going to build on what was covered in that article to examine the nuts and bolts of other types of procedures. In case you didnt complete the prerequisite, lets quickly go over what you need to know.
Key Takeaways:
- TERPS (Terminal Instrument Procedures) criteria are fundamental for instrument procedure design, defining Obstacle Evaluation Areas (OEAs), Required Obstacle Clearance (ROC), and Obstacle Clearance Surfaces (OCSs) to ensure pilot safety.
- En-route segments (including STARs and feeders) apply a constant ROC, but OEA construction varies significantly between conventional and RNAV segments, accounting for factors like turns and navaid accuracy, and may include Minimum Crossing Altitudes (MCAs) for obstacle protection.
- Departure procedures (ODPs) are regulatory and designed to ensure obstacle clearance, utilizing diverse departures, Visual Climb Over Airport (VCOA) procedures, or mitigation strategies like specified climb gradients, visual avoidance of close-in obstacles, or ceiling/visibility requirements.
- TERPS application is not always uniform, as waivers can be granted for procedures to ensure an equivalent level of safety, and many existing procedures remain valid under older criteria until significant amendments are required.
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