The move comes after investigators examined the cause of a fire on an Ethiopian Airlines 787 at London’s Heathrow Airport earlier this month. The unit is made by Honeywell International Inc.
The directive goes farther than the FAA indicated last week when it said airlines should inspect the units on 787’s for pinched wires in the casing and evidence of heat or moisture. Boeing also advised airlines last week to inspect or remove the device known as the emergency locator transmitter or ELT.
Officials said the ELT overheating is not connected to the lithium-ion battery problems that grounded the worldwide fleet of Dreamliners back in January.