2015-NM-036-AD Airbus Model A318‑111 and ‑112 airplanes; Model A319-111, ‑112, ‑113, ‑114, and -115 airplanes; Model A320‑211, ‑212, and ‑214 airplanes; and Model A321-111, ‑112, ‑211, ‑212, and -213 airplanes