The scheduled flight from Douala landed safely and there were no casualties, Cameroon Airlines said in a statement confirming the attack. The airline has grounded the plane while it assesses the damage.
“Thanks to the bravery of the captain, the aircraft was able to land smoothly despite the impact on its fuselage,” it said.
The English-speaking west of Cameroon has been a battleground since 2017 between the army and rebels seeking to form a breakaway state called Ambazonia.
Civilians have been caught up in the conflict from the start. More than 400 people have been killed and half a million have been forced to flee their homes.
However, Sunday’s incident appeared to mark an escalation in the danger they face travelling to and from the richly forested region.