Final answer:
The internal examination interval of AFFF and FFFP can vary depending on their effectiveness and shelf life.
Step-by-step explanation:
The internal examination interval of AFFF (Aqueous Film-Forming Foam) and FFFP (Film-Forming Fluoroprotein) depends on their effectiveness in extinguishing different types of fires. AFFF is typically effective for 3-5 years, while FFFP has a recommended shelf life of 2-3 years. However, it is important to note that the manufacturer's instructions and guidelines should be followed to ensure the effectiveness and safety of these fire suppression agents.