Icing conditions may also exist when ground temperature is 10°C or below and the aircraft operates on ramps, taxiways, or runways where surface snow, ice, standing water, or slush may be ingested by the engines or freeze on engines, nacelles, or engine sensor probes. Which condition describes this scenario?

Icing conditions may also exist when ground temperature is 10°C or below and the aircraft operates on ramps, taxiways, or runways where surface snow, ice, standing water, or slush may be ingested by the engines or freeze on engines, nacelles, or engine sensor probes. Which condition describes this scenario?

• A. OAT 15°C with clear dry pavement
• B. OAT 10°C or below with surface snow/ice/standing water/slush that may be ingested or freeze on engine components
• C. OAT 0°C with no moisture
• D. OAT above 20°C with visible moisture only in clouds

Answer: (B)

Ground icing on the ramp can occur when the surface temperature is at or below 10°C and there is moisture on the surface—such as snow, ice, standing water, or slush—that can be ingested by the engines or freeze on engine surfaces and sensor probes. This scenario matches because the temperature is 10°C or below and there is surface moisture that could interact with the engines or sensors. The other options don’t fit: a warmer, dry pavement provides no icing exposure; a temperature of 0°C with no moisture has no icing potential; and high temperature with visible moisture only in clouds describes in-flight icing, not ground icing.

Ground icing on the ramp can occur when the surface temperature is at or below 10°C and there is moisture on the surface—such as snow, ice, standing water, or slush—that can be ingested by the engines or freeze on engine surfaces and sensor probes. This scenario matches because the temperature is 10°C or below and there is surface moisture that could interact with the engines or sensors.

The other options don’t fit: a warmer, dry pavement provides no icing exposure; a temperature of 0°C with no moisture has no icing potential; and high temperature with visible moisture only in clouds describes in-flight icing, not ground icing.