MIL-B-4042E, MILITARY SPECIFICATION: BORESCOPE ASSEMBLIES, CYLINDER INSPECTION (04-NOV-1986) [NO S/S DOCUMENT]

MIL-B-4042E, MILITARY SPECIFICATION: BORESCOPE ASSEMBLIES, CYLINDER INSPECTION (04-NOV-1986) [NO S/S DOCUMENT]., This specification covers borescope assemblies (optical devices) with integral light source for visual inspection of internal combustion engine cylinders. The devices are for insertion through a fuel injection nozzle hole or other opening.