Which evidence is checked to detect tampering during lavatory preflight inspections?

• A. Evidence of tampering with smoke detectors
• B. Evidence of tampering with ashtrays
• C. Evidence of tampering with lavatory doors
• D. Evidence of tampering with water supply

Answer: (A)

The key idea is that tampering evidence is checked on components whose compromise would directly affect safety by delaying or preventing fire detection. In a lavatory, the smoke detector is a critical safety device that alerts crew to smoke or fire in the confined space. During preflight, you look for signs that someone has tampered with it, such as broken or missing tamper seals, a damaged or opened detector housing, or unusual wiring or mounting conditions. If the detector can’t be sealed, tested, or shows an abnormal status, it could mean the fire-detection system has been bypassed, which is a serious safety concern.

Other lavatory components, like ashtrays, doors, or the water supply, are important for normal operation and general safety checks, but they are not the primary indicators of tampering aimed at compromising fire detection during the preflight check.