pin down enemy aircraft

pin down enemy reserves

arming pin; safety pin

firing pin retaining pin

track pin retaining pin

belt-feed pawl pin / belt feed pawl pin

pin down

pin down with fire

tie down / tie-down

cargo tie-down / freight tie-down

freight tie-down / cargo tie-down

grind down enemy forces

grinding down enemy forces

keep the enemy down

rain down shells on the enemy

overwhelm an enemy / overwhelm the enemy

training aircraft (tng acft) / trainer aircraft

aircraft accident (flight accident; aircraft mishap)

aircraft armaments / aircraft weapons

aircraft accident / flight accident, aircraft mishap

aircraft mishap / flight accident, aircraft accident

aircraft modernization / aircraft upgrade

aircraft track and balance (adjusting balance of aircraft)

aircraft upgrade / aircraft modernization

aircraft weapons / aircraft armaments

flight accident / aircraft accident, aircraft mishap

low flying aircraft / low-flying aircraft

anti-aircraft artillery observation aircraft

firing pin

pin

piston pin

pivot pin

safety-pin ring