What does the black strap on the power supply handle specify?

Question

Options

• APSU
• BNAF
• CRAF
• DSpare PSU

• A
  3% (1)
• B
  87% (34)
• C
  8% (3)
• D
  3% (1)

Explanation

Option B (NAF) is correct because the black strap on a power supply handle is a color-coded serviceability indicator that designates the unit as NAF (Non-Airworthy/Not Available for Flight/Service). This visual marking system allows ground crew to quickly identify the status of equipment without needing to inspect documentation.

Why the distractors are wrong:

• A (PSU) - "PSU" describes what the item is (Power Supply Unit), not what the strap indicates; a label would convey that, not a colored strap.
• C (RAF) - RAF typically denotes the opposite status (Ready/Available for Flight), and would use a different color strap to indicate a serviceable unit.
• D (Spare PSU) - This describes a role/inventory category, not a serviceability condition communicated by strap color.

Memory tip: Think "Black = Back off" - a black strap signals the unit is not cleared for use (NAF), similar to how a red or black tag in maintenance contexts means "do not use." The color black = stop/unavailable reinforces the NAF status.

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