Definition
The vertical structural member of an aircraft door frame, forming part of the cabin opening. On many light airplanes the doorpost contains a small static port or vent and may carry placards, hinges, or latching hardware that should be inspected during preflight.
Plain English
The upright frame on the side of a door opening. On an airplane, it's the vertical part of the doorway you check during walk-around for damage, loose fittings, or blocked vents.
Context Anchor
Seen during a visual preflight inspection around cabin, cargo, or baggage doors, especially when checking for cracks, looseness, or damage near the door opening.
Why Pilots Care
Damage or cracks in the doorpost can allow the door to open in flight or compromise structural integrity.
Analogy
It is like the upright side of a car door frame: the door moves, but the post is the fixed structure the door closes against.
Intuition Check
Do not read doorpost as the door itself. In this context, it means the fixed upright frame beside the door opening.
Example Sentence 1
During preflight, she checked the doorpost for cracks and made sure the static port mounted on it was clear.
Example Sentence 2
The door would not close properly until the latch pin seated correctly in the doorpost strike plate.