From e07a553414967d3a090c9b2feea2d1fdfab082a7 Mon Sep 17 00:00:00 2001
From: Matthias Nott <mnott@mnsoft.org>
Date: Thu, 09 Apr 2026 18:01:16 +0200
Subject: [PATCH] Graphic updates.

---
 SPL Exam Questions EN/90 - Communications.md |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/SPL Exam Questions EN/90 - Communications.md b/SPL Exam Questions EN/90 - Communications.md
index 16d616a..2af641f 100644
--- a/SPL Exam Questions EN/90 - Communications.md
+++ b/SPL Exam Questions EN/90 - Communications.md
@@ -1724,14 +1724,14 @@
 
 #### Answer
 
-B)
+A)
 
 #### Explanation
 
-An aircraft may use its abbreviated callsign once radio communication is well established with the ground station, and only after the ground station has itself first used the abbreviated form.
+Per ICAO Annex 10 Vol II / SERA.14050: an aircraft shall not use an abbreviated callsign until the aeronautical station has addressed the aircraft using the abbreviated form. The ground station initiates the abbreviation — only then may the pilot follow suit.
 
-- **Option A** is partly correct but incomplete — it is the ground station's use that triggers permission.
-- **Option C** (heavy traffic) and Option D (no confusion risk) do not independently grant abbreviation rights; the ground station must initiate it.
+- **Option B** ("once communication is well established") is vague and not the regulatory criterion. Communication being "well established" is a precondition for the station to decide to abbreviate, but the trigger for the pilot is the station's actual use of the short form.
+- **Option C** (heavy traffic) and **Option D** (no confusion) are factors the station considers before abbreviating, but neither independently grants the pilot permission to abbreviate.
 
 ### Q73: An aircraft fails to establish radio contact with a ground station on the designated frequency or any other appropriate frequency. What action must the pilot take? ^t90q73
 

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