safe speed

supersonic speed (exceeds speed of sound / Mach 1)

variable-speed with speed control

instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)

Nr gauge (Nr = speed of rotation) / rotor speed sensor

Motor PWM speed separated from PID speed

low-energy (eye-safe) laser

made safe

safe anchorage

safe and secure environment

safe area

safe corridor (naut.)

safe entry time

safe haven

safe humanitarian zone

safe lane

safe operation of the vessel

safe state

ship citadel (safe haven from pirates)

safe terrain clearance

Trails, Lay, Aimpoint established, Boresight verified, Safe [verification of lay], Prefire checks performed, Ammunition Prepared

safe a gun

blow a safe house

bore-safe fuze

fire-and-safe unit

fail-safe structure

safe life

fail-safe procedure

safe evacuation

safe forced landing

safe landing

safe load

safe operation