---
title: "SERA.13001 – SERA.13020: SECTION 13 SSR Transponder and ADS-B transmitters (ANNEX: Rules of the Air, SERA) — rule index · Avioverse"
description: "SERA.13001 – SERA.13020, Regulation (EU) No 923/2012. When an aircraft carries a serviceable SSR transponder, the pilot shall operate the transponder at…"
url: "https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13"
---

# SECTION 13 SSR Transponder and ADS-B transmitters

ANNEX: Rules of the Air · Standardised European Rules of the Air (SERA) · Regulation (EU) No 923/2012 · SERA.13001 – SERA.13020

On this page

1. ## [SERA.13001 Operation of an SSR transponder](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13001)

   When an aircraft carries a serviceable SSR transponder, the pilot shall operate the transponder at all times during flight, regardless of whether the…

   [GM1 SERA.13001 Operation of an SSR transponder](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13001#gm1-sera-13001)

   [GM1 SERA.13001(c) Operation of an SSR transponder](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13001#gm1-sera-13001-c)

   [GM2 SERA.13001(c) Operation of an SSR transponder](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13001#gm2-sera-13001-c)

2. ## [SERA.13005 SSR transponder Mode A code setting](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13005)

   To indicate that it is in a specific contingency situation, the pilot of an aircraft equipped with SSR shall:

   [GM1 SERA.13005(a) SSR transponder Mode A code setting](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13005#gm1-sera-13005-a)

   [AMC1 SERA.13005(c) SSR transponder Mode A code setting](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13005#amc1-sera-13005-c)

3. ## [SERA.13010 Pressure-altitude-derived information](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13010)

   When the aircraft carries serviceable Mode C equipment, the pilot shall continuously operate this mode unless otherwise dictated by ATC.

   [GM1 SERA.13010(b) Pressure-altitude-derived information](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13010#gm1-sera-13010-b)

   [GM2 SERA.13010(b) Pressure-altitude-derived information](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13010#gm2-sera-13010-b)

4. ## [SERA.13015 On-board aircraft identification setting](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13015)

   Aircraft equipped with a Mode S or ADS-B transmitter that has an aircraft identification feature shall transmit the aircraft identification as specified…

   [AMC1 SERA.13015 On-board aircraft identification setting](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13015#amc1-sera-13015)

   [GM1 SERA.13015 On-board aircraft identification setting](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13015#gm1-sera-13015)

   [GM2 SERA.13015 On-board aircraft identification setting](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13015#gm2-sera-13015)

   [GM3 SERA.13015 On-board aircraft identification setting](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13015#gm3-sera-13015)

   [GM4 SERA.13015 On-board aircraft identification setting](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13015#gm4-sera-13015)

   [GM5 SERA.13015 On-board aircraft identification setting](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13015#gm5-sera-13015)

5. ## [SERA.13020 SSR transponder failure when the carriage of a functioning transponder is mandatory](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13020)

   In case of a transponder failure after departure, ATC units shall attempt to provide for continuation of the flight to the destination aerodrome in…

   [GM1 SERA.13020(a) SSR transponder failure when the carriage of a functioning transponder is mandatory](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13020#gm1-sera-13020-a)

   [GM1 SERA.13020(b) SSR transponder failure when the carriage of a functioning transponder is mandatory](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-13/sera-13020#gm1-sera-13020-b)

Consolidated from the EASA Easy Access Rules (revision 26 Aug 2025, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.

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