Definition
The minimum cloud ceiling, expressed in feet above the ground, that must exist at an airport before a pilot may legally conduct a particular operation such as a takeoff, approach, or landing under instrument flight rules. Ceiling requirements are published as part of instrument approach procedures, departure procedures, and certain regulatory operating rules, and they work alongside visibility minimums to define whether the weather is good enough for the operation to proceed.
Plain English
The lowest cloud base allowed for a given flight operation. If the clouds are lower than that number, the pilot is not permitted to do the operation.
Context Anchor
Seen when checking weather minimums for an instrument departure, approach, alternate airport, or company-approved operation.
Derivation
The word ceiling comes from the idea of a roof overhead. In aviation, the cloud layer acts like a roof above the airport — the ceiling requirement sets how low that roof is allowed to be before the operation is off-limits.
Why Pilots Care
Determines whether a departure can be made under visual rules or requires instrument procedures, directly affecting safety and legality.
Grounding Statement
If a departure requires an 800-foot ceiling and the airport is reporting a 400-foot ceiling, the clouds are too low for that requirement.
Intuition Check
Do not read ceiling requirements as a general wish for “good weather.” They are specific minimum cloud-height values that must be checked against the reported weather.
Example Sentence 1
The approach chart showed a ceiling requirement of 600 feet, so when the AWOS reported an overcast layer at 400 feet, the crew held off and waited for conditions to improve.
Example Sentence 2
Because the reported ceiling was below the published minimum, the flight had to wait for improved conditions.