Boeing has asked airlines to inspect up to 1,200 aircraft across its fleet to gather data on Honeywell emergency beacons that have come under scrutiny following a fire on a parked 787 Dreamliner two weeks ago.

The blaze caused serious damage to the jet owned by Ethiopian Airlines at London’s Heathrow on July 12.

Between 1,100 and 1,200 Boeing aircraft of all sizes have been fitted with the beacons, but Boeing is asking that airlines inspect as many as possible and report back within 10 days to help regulators decide what action to take, if any.

“Boeing is asking specific operators of 717, Next-Generation 737, 747-400, 767 and 777s to inspect aircraft with the Honeywell fixed emergency locator transmitters,” a Boeing spokesman said in an e-mailed statement late on Sunday.

“The purpose of these inspections is to gather data to support potential rule-making by regulators,” he added. British accident investigators traced the fire to the area housing one of the units and recommended worldwide inspections of all lithium battery-powered emergency locator transmitters.

The US Federal Aviation Administration instructed airlines on Thursday to remove or inspect Honeywell fixed emergency beacons in the model which caught fire, the 787, but has not so far widened its mandatory checks to other models.

The beacons in question are designed to help rescue workers locate aircraft in the event of a crash.

They are installed on approximately 20 types of aircraft, including many Boeing and Airbus passenger jets and several types of business aircraft.

“Boeing’s recommendation of fleet-wide checks of the Emergency Locator Transmitters (ELT) suggests that Boeing thinks it is not a 787 problem, but an ELT problem,” said Paul Hayes, director of safety at UK-based aviation consultancy Ascend.