The switches control fuel flow to aircraft engines, allowing pilots to start or shut them down on the ground, or manually intervene during in-flight engine failures.

Air India said on Tuesday it has completed precautionary inspections of the fuel control switch locking mechanism on all 787 and 737 aircraft, with no issues detected.

A preliminary report from India‘s Aircraft Accident Investigation Bureau earlier this month found the switches had almost simultaneously flipped from “run” to “cutoff” shortly after takeoff, causing the engines to lose power.

Reuters reported last week, citing a source, that the cockpit recording on the Air India flight from Ahmedabad to London Gatwick suggested the captain cut fuel to the engines.

Earlier this month, the FAA and Boeing privately issued notifications that the fuel switch locks on Boeing planes were safe.