An Air India aircraft that was scheduled to fly to Delhi had to return to Kathmandu airport due to a noise heard by the pilots during take-off. The incident occurred after it was discovered that a door in the aircraft was unserviceable. However, the airline confirmed that the two issues were not related and at no point was safety compromised. The pilots decided to return as a precautionary measure because they suspected a possible tail strike. Later, it was confirmed that there was no tail strike. The A321 aircraft operated the flight to Delhi on the following morning after necessary checks were performed.