"Generally, locusts are found at lower levels and therefore pose a threat to aircraft in the critical landing and takeoff phase of the flight. Almost all air intake ports of the aircraft will be prone to ingestion in large numbers, if the aircraft flies through a swarm (areas like engine inlet, air-conditioning pack inlet etc.)," the regulator said in its circular.
Pitot and static sources can also get partially or fully blocked while flying through locust swarms, the Directorate General of Civil Aviation said.
"Blocked pitot and static sources lead to erroneous instrument indications, especially unreliable air speed and altimeter indications," it said.
A pitot tube in airplanes is used to measure the flow speed of the wind.