What are the two possible names for the two types of safety alerts? LP-16, pg. 15

• A. Obstruction Alert and Mode C Intruder Alert
• B. Proximity Alert and Traffic Alert
• C. Obstruction Alert and Altitude Alert
• D. Runway Incursion Alert and Mode C Intruder Alert

Answer: (A)

In this safety-alert framework, two distinct hazard sources are recognized: obstructions in the flight path and nearby aircraft that report altitude. The two names used for these alerts are Obstruction Alert and Mode C Intruder Alert. An Obstruction Alert covers any obstacle—terrain or man-made—that could pose a collision risk and needs attention to avoid contact. A Mode C Intruder Alert is triggered when another aircraft with a Mode C altitude-transmitting transponder enters the defined protected airspace, signaling a potential mid-air conflict and prompting appropriate avoidance or separation actions.

This pairing matches the terminology given in LP-16, page 15. The other options mix terms from different alert systems (such as generic proximity or traffic concepts, altitude-only alerts, or runway incursion alerts) and do not reflect the two specific safety-alert names described here.