Potable water levels are displayed in what increments?

• A. 0%, 25%, 50%, 75%, 100%
• B. 10%, 30%, 50%, 70%, 90%
• C. 0%, 20%, 40%, 60%, 80%
• D. 5%, 25%, 50%, 75%, 100%

Answer: (A)

Potable water level is shown on a simple 0 to 100% scale with five evenly spaced steps, so the crew can quickly assess the tank status at a glance. The five levels—empty, 25%, 50%, 75%, and full—provide a clear, unambiguous read without overwhelming the pilot with too many marks. This straightforward layout is chosen to balance readability with the need to know whether the system is sufficiently filled for preflight or flight operations. Other options would either omit an end, use uneven or misleading increments, or start at a nonzero value, which would make quick interpretation less reliable.