Apache Helicopter Makes Emergency Landing Due to Maintenance Issue in Buan
Fortunately no one in the helicopter or on the ground were injured due to this emergency landing caused by a maintenance fault:

A U.S. Army helicopter made a precautionary landing approximately 110 miles from its home base in South Korea after detecting a potential mechanical issue, according to the 2nd Infantry Division. Two AH-64 Apache pilots based at Humphreys were on a routine training flight near Kunsan Air Base on Monday when they detected an apparent problem with the aircraft, the command said in a news release that day. The unarmed Apache landed near Buan city at 12:10 p.m. out of an abundance of caution, 2nd ID spokesman Maj. Steven Modugno told Stars and Stripes by email the next day.
You can read more at the link.


Precautionary landing, they happen. Chip light illumination from one the power train gearboxes is a common reason.