The FAA has adopted a new airworthiness directive for the Global 7500, model BD-700-2A12 airplanes. The AD was prompted when several airplanes were reported to have a later effect offset observed on the head-up display (HUD) between the synthetic vision system (SVS) and the actual runway due to the mechanical misalignment of the HUD during manufacturing and assembly.
The AD has required the revision of the existing airplane flight manual (AFM) and has prohibited a steep approach landing (SAL) and enhanced flight vision system (EFSV) operations. Another requirement is the calibration of the HUD. The FAA issued this AD to address the potential risk with the products. The AD is effective on March 17, 2023 and the Director of the Federal Register has approved this date.
The FAA had proposed to adopt a new AD with a notice to proposed rulemaking (NPRM) for the 7500 on June 6, 2022. Comments were received until Aug. 5 and the final rule was passed on Feb. 10, 2023.
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Concerns had been reported for the 7500 since 2021 and Transport Canada Civil Aviation (TCCA), the aviation authority for Canada, issued TCCA AD to correct the unsafe conditions. It was reported that during production, the lateral offset had been observed on the HUD of many planes between the SVS and the actual runway. The investigation determined that the cause was a mechanical misalignment and the AD was proposed by the FAA.
Bombardier has released documents to specify the procedure for calibrating the HUD, including an inspection of the mounting brackets and sill beams for any damage or contamination of mating surfaces or injection holes. An inspection is also needed for any holes in the structural adhesive. If any problem is found, corrective actions include replacing damaged brackets and filling holes with more structural adhesive. Three separate service bulletins were posted by the company for the different airplane configurations.
The FAA received comments on the NPRM for the AD from Executive Jet Management. EJM had said that the Bombardier airplanes often involve approval for alternative methods of compliance (AMOCs) because AFMs and other information required for the plane often become outdated before the AD can become effective. EJM expressed concern over the increasing amount of Bombardier ADs requiring AMOCs due to the heavy burden they place on the user or company.
Global 7500
EJM noted that the European Union Aviation Safety Agency (EASA) allows the use of later-approved revisions for the required service information as acceptable compliance and requested a similar process to “streamline their workload and enhance safety.”
The FAA partially agreed with the response from EJM. It was agreed that certain sections of the 7500’s AFM have been revised, but the agency disagreed with the request to allow later-approved revisions since the FAA is required by the Office of the Federal Register (OFR) to have regulations for approval of materials incorporated and either published in service documents for approval from the OFR.
The use of the 7500 has been approved for operation in the U.S. and after reviewing relevant data about concerns, the FAA has issued the AD accordingly.
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