USCG Exam PracticeHydraulics and pneumatics
Under 46 CFR §28.880, a hydraulically operated crane is considered 'fail-safe' when which of the following conditions is met?
- A. The crane automatically returns to its stowed position whenever hydraulic pressure drops below 50 percent of operating pressure.
- ✓ A component failure results in a slow and controlled release of the load so as not to endanger personnel.Correct
- C. The crane is equipped with a mechanical holding device that locks the load in place upon loss of pressure.
- D. The hydraulic circuit is fitted with a check valve that maintains pressure in the actuator for at least 30 minutes after pump shutdown.
Why B is correct
46 CFR §28.880(g) defines a fail-safe system as one in which a component failure results in a slow and controlled release of the load so as not to endanger personnel. A mechanical holding device is an alternative means of compliance, not the definition of fail-safe.
Cited:46 CFR §28.880