# General Operational Requirements

> Common operational procedures and regulations.

- **Subject:** 070 — Operational Procedures
- **Section:** 071-01 — General Requirements
- **Topic code:** 071-01-02
- **Last reviewed:** 2026-04-01
- **Author:** Pablo Asensio Martínez
- **HTML version:** https://pilotsyllabus.com/en/operational-procedures/general-requirements/operational-requirements/

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## Sterile Cockpit Rule
Regulations mandate that during critical phases of flight (Taxi, Take-off, Landing, and all operations below 10,000 ft except cruise), the crew must refrain from non-essential duties or conversation. Focus must be solely on the operation of the aircraft.

## Noise Abatement Procedures (NADP)
Designed to minimize noise impact over populated areas during departure.
*   **NADP 1**: Focuses on noise reduction **close** to the airport. Involves climbing with high thrust and maintaining V2+10/20kt to 3,000 ft.
*   **NADP 2**: Focuses on noise reduction **further away**. Accelerating and cleaning up flaps earlier (usually at 800 ft / 3000 ft) to reduce drag and thrust.

## Equipment Requirements
*   **MMEL (Master Minimum Equipment List)**: Established by the manufacturer/authority. Defines which systems can be inoperative for the aircraft type.
*   **MEL (Minimum Equipment List)**: Created by the operator (based on MMEL). Must be no less restrictive than MMEL. Used by pilots/engineers to determine if dispatch is allowed with a broken item.
*   **CDL (Configuration Deviation List)**: List of missing external parts (e.g., fairings, static wicks) that can be missing, usually with a performance penalty.

## Passenger Briefing

![Female flight attendant performing a pre-flight safety demonstration](https://upload.wikimedia.org/wikipedia/commons/9/93/Female_flight_attendant_performing_a_pre-flight_safety_demonstration.jpg)

Passengers must be briefed on safety matters:
*   Before Take-off: Seat belts, emergency exits, oxygen, life vests, braces.
*   After Take-off: Smoking restrictions.
*   Before Landing: Seat belts, tray tables, seat backs.

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