Definition
In the context of an attitude indicator, a malfunction in which the instrument's display becomes stuck and no longer responds to changes in aircraft attitude. The horizon bar and miniature aircraft remain fixed in position even as the airplane pitches or rolls, giving false indications of level flight.
Plain English
The attitude indicator stops working properly and its display gets stuck in one position, so it keeps showing the same picture no matter what the airplane is actually doing.
Context Anchor
Seen in instrument discussions when describing ways an attitude indicator or its supporting system can fail or give an unreliable display.
Derivation
From the everyday sense of 'freezing' meaning 'becoming locked in place and unable to move.' Here it does not refer to ice or cold temperatures — it describes the instrument's display becoming motionless, as if frozen.
Why Pilots Care
A frozen attitude indicator is dangerous because it continues to look normal while giving completely false information. Without cross-checking other instruments, a pilot can fly into an unusual attitude believing they are straight and level. This is why the standard instrument scan never relies on a single instrument.
Grounding Statement
If the attitude indicator display stops changing while the aircraft is still moving, treat it as a warning that the instrument may no longer be reliable.
Intuition Check
Freezing does not only mean “the outside temperature is below 32°F.” Here it means cold, ice, or sticking has made a part, instrument, or system stop working normally.
Example Sentence 1
During the climb, the pilot noticed the attitude indicator was freezing and immediately transitioned to the backup instruments.
Example Sentence 2
Moisture on the wings began freezing as the aircraft climbed through the 0-degree isotherm.