Is this normal? · Climb
A thunk and rumble just after liftoff
Short answer
Normal. That's the landing gear folding up into its bays and the gear doors closing.
Where this comes from
Thunks, whirs, chimes and the famous "barking dog" — what you're hearing, from gate to gate.
Read: Normal sounds on a flight
Based on: FAA Airplane Flying Handbook (FAA-H-8083-3); FAA, "Turbulence: Staying Safe" (seat belt sign rules).
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