# Maintenance and Monitoring Systems: ACMS Data Use and FDM Safety Analytics

> Understand ACMS/AIDS monitoring workflows and FDM safety programs for predictive maintenance, trend detection, and training feedback.

- **Subject:** 022 — Instrumentation
- **Section:** 022-14 — Maintenance, Monitoring and Recording Systems
- **Topic code:** 022-14-03
- **Last reviewed:** 2026-03-27
- **Author:** Pablo Asensio Martínez
- **HTML version:** https://pilotsyllabus.com/en/instrumentation/maintenance-monitoring-and-recording-systems/maintenance-and-monitoring-systems/

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## Aeroplane Condition Monitoring System (ACMS)
**ACMS** (Airbus refers to it as **AIDS** - Aircraft Integrated Data System) monitors aircraft systems to identify maintenance needs and anticipate failures.
*   **Function**: Continuously or periodically measures system parameters (Engines, APU, Flight Controls, etc.).
*   **Transmission**: Data can be transmitted automatically via **Datalink (ACARS)** to the operator's Maintenance Control Center **without crew notification**, or printed on the flight deck.
*   **Goal**: Predictive maintenance and troubleshooting.

## Flight Data Monitoring (FDM)
**FDM** is a systematic method of accessing, analyzing, and acting upon information obtained from digital flight data records of routine daily operations. It is a requirement for operators of aircraft > 27,000 kg.
*   **Purpose**: To improve **Flight Safety** and operational efficiency.
    *   Identify potential risks and adverse safety trends.
    *   Modify and **tailor pilot training programs**.
*   **Principles**:
    *   **Non-Punitive**: Data is used for safety, not discipline.
    *   **Anonymous**: Data is de-identified, except in cases of "grave exceedances" where further investigation is warranted.

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