Definition
A method of mounting a magnetic compass in which the compass card and its magnets are suspended in a damping fluid by a pivot resting in a jeweled bearing, allowing the card to swing freely and tilt slightly as the aircraft maneuvers. The flexible suspension lets the magnets remain roughly aligned with the Earth's magnetic field while the instrument case moves with the aircraft.
Plain English
A way of hanging the compass card inside the compass so it can move and tilt freely, staying lined up with magnetic north even when the aircraft banks or pitches.
Context Anchor
Seen in aircraft maintenance, especially when discussing engine mounts, vibration problems, and inspection of rubber mounting parts.
Derivation
Flexible comes from the Latin flexibilis, meaning 'able to bend.' Suspension comes from the Latin suspendere, 'to hang.' Together the term describes a hanging arrangement that can bend or move — exactly what lets the compass card stay level while the aircraft tips around it.
Why Pilots Care
Reduces airframe vibration, lowers fatigue on attached parts, and improves crew and passenger comfort.
Analogy
It is like a machine sitting on rubber feet instead of directly on a hard floor. The rubber does not let the machine wander around, but it does soften the vibration passed into the floor.
Intuition Check
Flexible suspension does not mean the engine or part is loose. It means it is deliberately supported by mounts that allow only small, controlled movement.
Example Sentence 1
The magnetic compass uses a flexible suspension so the card can stay aligned with magnetic north even when the aircraft banks.
Example Sentence 2
Excessive vibration disappeared once the flexible suspension mounts were properly torqued and aligned.