# Performance Class A (CS-25): Landing Data Application

> Using performance data to determine maximum landing mass and required distances.

- **Subject:** 032 — Performance
- **Section:** 032-05 — CS-25-Applicable Operational Requirements Performance Class A – Use of Aeroplane Performance Data
- **Topic code:** 032-05-03
- **Last reviewed:** 2026-04-01
- **Author:** Pablo Asensio Martínez
- **HTML version:** https://pilotsyllabus.com/en/performance/cs-25-applicable-operational-requirements-performance-class-a-use-of-aeroplane-performance-data/landing/

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## Performance Limits

The Maximum Structural Landing Mass is a hard limit, but operational conditions often impose lower limits. The **Regulated Landing Mass** is the lowest of:

1.  **Field Length Limit**: Mass that allows stopping within the required % of the runway (Dry/Wet).
    *   Requires correct configuration (Flaps, Brakes).
2.  **Climb Limit (WAT Limit)**: Mass that ensures the minimum climb gradients in a Go-Around.
    *   **Approach Climb**: One engine inoperative, flaps approach, gear up.
    *   **Landing Climb (Balked Landing)**: All engines operating, flaps landing, gear down.

Tables or charts provide the "WAT Limited Weight" based on Aerodrome Pressure Altitude and Temperature. High/Hot conditions severely restrict this weight.

## Quick Turnaround Limit (Brake Cooling)
After a landing, especially a heavy braking one or a Rejected Take-off (RTO), brake temperature rises significantly.
*   **Requirement**: A minimum cooling time is required before the next take-off to ensure brakes can absorb the energy of a subsequent RTO.
*   **Charts**: Brake Cooling Schedule charts use landing weight, brake application speed, and OAT to give the required cooling time (ground idle or flight with gear down).

## Runway Surface Condition (RWYCC)
Modern reporting uses the **Runway Condition Report (RCR)** and **Runway Condition Code (RWYCC)** from 0 to 6.
*   Performance data tables map RWYCC to braking action (e.g., 6=Dry, 5=Wet/Good, ..., 1=Poor/Ice).
*   Correct operational landing distances are derived based on these codes.

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Free study notes from pilotsyllabus.com. Not a substitute for training at an approved ATO.