# Long Range & Polar Operations

> Special procedures for ETOPS (EDTO) and flights over polar regions.

- **Subject:** 070 — Operational Procedures
- **Section:** 071-01 — General Requirements
- **Topic code:** 071-01-03
- **Last reviewed:** 2026-04-01
- **Author:** Pablo Asensio Martínez
- **HTML version:** https://pilotsyllabus.com/en/operational-procedures/general-requirements/long-range-flights/

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## ETOPS / EDTO

![ETOPS rating flight path](https://upload.wikimedia.org/wikipedia/commons/1/17/ETOPS_rating_flight_path.svg)

**Extended Diversion Time Operations (EDTO)** is the modern term for ETOPS (Extended-range Twin-engine Operational Performance Standards).
*   **Definition**: Operations of twin-engine aircraft further than a specific threshold time (usually 60 minutes) from an adequate aerodrome at one-engine-inoperative cruise speed.
*   **Approval**: Requires both **Type Design Approval** (Aircraft reliability) and **Operational Approval** (Maintenance, procedures, training).
*   **Thresholds**: 60 mins is standard. EDTO allows 120, 180, 240+ minutes.
*   **Critical Fuel Scenario**: Fuel required to divert from the most critical point (Critical Point/Equal Time Point) to the alternate following engine failure and/or depressurization.

## Polar Operations
Flights in high latitudes (typically > 78° N/S).
*   **Challenges**:
    *   **Navigation**: Magnetic compass becomes unreliable (Dip). True North or Grid Navigation must be used.
    *   **Communication**: VHF unavailable. HF propagation issues (solar flares). SATCOM (Iridium) required as Geostationary satellites (Inmarsat) are below the horizon.
    *   **Fuel Freezing**: Extremely low temperatures (-60°C to -80°C). Fuel temperature must be monitored (Minimum +3°C above freezing point: Jet A1 freezes at -47°C).
    *   **Cosmic Radiation**: Higher exposure at poles.
    *   **Rescue**: Remote terrain, difficult SAR.

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