🔍 Key Concepts

• Hydrostatic release units (HRUs) purpose and how they work • Required inspection and servicing intervals for lifesaving appliances on fishing vessels • Difference between inspection, servicing, testing, and replacement schedules

💭 Think About

• Think about how often a device that is activated by water pressure and exposed to the weather should be checked, versus fully replaced • Consider which interval (monthly, quarterly, annually, five years) is most realistic and commonly used in regulations for safety-critical equipment like liferaft releases • Ask yourself: Do regulations usually require frequent ‘testing’ of HRUs on board, or periodic servicing/replacement by an approved facility?

✅ Before You Answer

• Verify in 46 CFR requirements for inflatable liferafts and hydrostatic release units on fishing vessels • Check which action is specified in regulations: servicing, testing, overhaul, or replacement, and at what time interval • Confirm whether the same time interval used for HRUs matches any of the answer choices (monthly, quarterly, annually, five years)