# Noise Abatement Procedures

> Procedures to minimize noise impact.

- **Subject:** 070 — Operational Procedures
- **Section:** 071-02 — Special Operational Procedures and Hazards (General Aspects)
- **Topic code:** 071-02-04
- **Last reviewed:** 2026-04-01
- **Author:** Pablo Asensio Martínez
- **HTML version:** https://pilotsyllabus.com/en/operational-procedures/special-operational-procedures-and-hazards-general-aspects/noise-abatement/

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## Operational Procedures for Noise Abatement

![Qantas b747 over houses](https://upload.wikimedia.org/wikipedia/commons/3/3c/Qantas_b747_over_houses_arp.jpg)

*   **NADP 1 (Noise Abatement Departure Procedure 1)**: Intended to provide noise reduction for noise-sensitive areas in close proximity to the departure end of the runway.
    *   Thrust reduction at/above 800 ft (and typically below 1500 ft).
    *   Maintain V2 + 10-20 kt.
    *   Retract flaps and slats at 3,000 ft.
*   **NADP 2 (Noise Abatement Departure Procedure 2)**: Intended to provide noise reduction for areas more distant from the runway end.
    *   Thrust reduction at/above 800 ft.
    *   Accelerate towards Vzf (Zero Flap Speed) while retracting flaps/slats (between 800 ft and 3,000 ft).
    *   Continue climb at transition speed.

## Restrictions
*   Noise abatement procedures should not be executed below **800 ft AGL**.
*   Safety always takes precedence over noise abatement (e.g., wind shear, engine failure, traffic avoidance).

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