( CNN ) -- As part of Boeing 's ongoing efforts to resolve Dreamliner problems , the passenger jet maker has put out a request that airlines inspect an emergency beacon used to find aircraft in the event of a crash . The request is based on a recommendation by the United Kingdom 's Air Accidents Investigation Branch ( AAIB ) following a fire aboard an Ethiopian Airlines 787 Dreamliner parked at London 's Heathrow Airport on July 12 . The fire caused extensive damage to the rear of the aircraft . No one was hurt but the incident shut runways for about an hour before operations resumed , the airport said . Randy Tinseth , vice president marketing for Boeing Commercial Airplanes , said in a statement that in addition to the 787 , the company has also asked operators of 717 , Next-Generation 737 , 747-400 , 767 and 777 airplanes to inspect aircraft . `` We 're taking this action following the UK AAIB Special Bulletin , which recommended that airplane models with fixed Honeywell ELTs be inspected , '' he said . `` The purpose of these inspections is to gather data to support potential rule-making by regulators . '' The AAIB said the emergency locator transmitter ( ELT ) -- which uses its own battery to send details of a plane 's location in the event of a crash -- is now the focus of its investigation . `` Detailed examination of the ELT has shown some indications of disruption to the battery cells , '' said the AAIB bulletin . `` It is not clear however , whether the combustion in the area of the ELT was initiated by a release of energy within the batteries or by an external mechanism such as an electrical short . '' 'Airworthiness Directive ' expected . Distancing Boeing from the malfunction , Tinseth said `` it 's important to note that Honeywell ELTs have been deployed on approximately 20 aircraft models -- including Boeing , Airbus and numerous business aviation aircraft . '' Honeywell , the maker of the emergency beacon , said it had no knowledge of any problem with its emergency transmitter , certified by the Federal Aviation Authority since 2005 . Last week , the U.S. Federal Aviation Administration ( FAA ) instructed airlines operating the 787 to remove or inspect the Honeywell ELTs . `` The FAA is preparing to issue an Airworthiness Directive in the coming days that would make these inspections mandatory , '' said the FAA statement , released July 20 . `` Federal Aviation Regulations do not require large commercial aircraft in scheduled service to be equipped with these devices . '' The investigations come little more than two months since the Dreamliners were allowed back in the air following a retrofit to fix an issue with its lithium-ion batteries . Customer demand for the super-efficient airliner has remained solid despite the grounding earlier this year . Boeing has delivered 68 of the planes to 13 airlines and has 862 unfilled orders . It says it plans to increase production to 10 per month by the end of the year , double the rate earlier this year . Meanwhile , Boeing is facing a possible US $ 2.75 million civil penalty for allegedly using certain parts in 777 construction that did not meet standards and repeatedly missing deadlines to address related quality control issues . The FAA proposed the fine , saying Boeing 's commercial aircraft division took more than two years to fully address problems after learning about quality control gaps involving fasteners in 777 construction . CNN 's Michael Martinez , Thom Patterson , Mike M. Ahlers and Mark Thompson contributed to this report .
Boeing asks airlines to inspect planes equipped with FAA emergency locators . U.S. investigators say transmitter likely to blame for 787 fire at Heathrow the end of the year . In Heathrow , Boeing faces $ 2.75 million Boeing penalty .