Sierra Pattern A320 __exclusive__ -
Introduction
The Sierra Pattern A320 approach procedure has several key features: sierra pattern a320
- Entry: You are gliding at 220 KIAS, clean.
- Downwind leg: You fly straight, losing altitude but maintaining energy.
- The "Base" turn: A standard rate turn (15°-25° bank).
- The "S" (Sierra) turn: This is the crucial, counter-intuitive step. Instead of completing a simple oval, you perform a series of S-turns within the pattern. Why? To deliberately trade altitude for airspeed, then airspeed for altitude, repeatedly "pumping" the windmilling core.
Step 3: The Level Segment (Critical Phase)
- Thrust: Autothrust will increase from IDLE to SPEED or THRUST mode to maintain the target speed during the level segment.
- Pilot Action: Do not pull the altitude selector. Allow the FMS to fly the level segment.
- Monitoring: Watch the PROG page vertical deviation. The magenta diamond will move to the center as you fly level.
- Duration: Can be as short as 0.5 NM or as long as 10+ NM depending on speed and altitude difference.
The focus of this report is the operational safety implications of the "Sierra" profile, specifically analyzing the risks associated with high-energy approaches, excessive descent rates, and thrust management during the final phases of flight. The A320’s fly-by-wire logic and flight mode guidance (FMGC) require precise management of the "Sierra" profile to ensure compliance with stabilized approach criteria. Introduction The Sierra Pattern A320 approach procedure has
3. Step-by-Step Execution (Condensed from FCOM)
Assuming both engines have failed, windmill restart attempts (Procedure "A") have failed, and you are above FL 250. Entry: You are gliding at 220 KIAS, clean