Originally Posted by
Smilin_Ed
Could this have been a "retaining ring"?
Yes, you have that right. Apparently the MEC was replaced a couple of days prior to accident.
AIB Report:
http://www.airforcemag.com/AircraftA...16_Andrews.pdf
Records indicated the mishap engine (ME),
serial number (S/N) 509307, went through a modernized digital engine control (MDEC) upgrade
to comply with TCTO 2J-F110-838 on 31 March 2017, and had accumulated 0.0 flight hours prior
to the mishap (Tabs D-25 and U-3 to U-4).
Engine Shop received the overhauled MA MEC from
the supply system on 3 April 2017, and MA MEC was installed on ME S/N 509307 and passed an
operational engine run test on 4 April 2017 (Tabs D-13, D-23, and J-4).
600-degree spiral retaining ring