2017-NM-122-AD Airbus Model A318‑111 and ‑112 airplanes, Model A319‑111, ‑112, ‑113, ‑114, and ‑115 airplanes, Model A320‑211, ‑212, ‑214, and -216 airplanes, and Model A321‑111, ‑112, ‌‑211, ‑212, and ‑213 airplanes