FAA Orders Fuel Tank Checks on 60 Boeing 787s Over Lightning Risk

The Federal Aviation Administration has ordered inspections of 60 US-registered Boeing 787 Dreamliners, warning that a sealant defect inside the fuel tanks could create a spark during a lightning strike and risk an explosion.

The airworthiness directive, published in the Federal Register on 2 November, covers certain 787-8, 787-9 and 787-10 aircraft. It takes effect on 7 December 2026.

The problem traces back to production. Sealant inside the centre wing fuel tanks of some jets may not have received the required visual and adhesion inspections, and Boeing could not produce records confirming the checks were done. If a defect went undetected, the FAA says, an ignition source could develop inside the fuel tank.

“The unsafe condition, if not addressed, could result in development of an ignition source within the fuel tank volume and a risk of a fuel tank explosion during a lightning strike event,” the FAA said in the directive.

What airlines must now check

Operators of the affected jets must carry out a detailed inspection of specified sealant in the left, right and centre wing side-of-body areas, including the area between the side-of-body rib and rib 2. They must also run adhesion tests and repair anything defective.

The FAA estimates the work at 34 hours per aircraft, at a cost of about $2,890 per jet — $173,400 across the 60 US-registered aircraft, before any repairs. Boeing has indicated some of the cost may fall under warranty.

The directive is limited to a specific batch of aircraft identified in a Boeing alert bulletin, not the whole 787 fleet. The FAA said the required sealant inspections are now being carried out during production on aircraft outside the scope of the order.

No grounding — and a second directive for the 747

The FAA has not grounded any aircraft as part of the order. Boeing says the 787 has several other layers of lightning protection, and lightning strikes hit commercial aircraft routinely, so the directive is a maintenance action rather than a safety emergency. It is, however, the latest in a string of FAA actions on 787 production issues this year. In July, the FAA restored Boeing’s authority to issue airworthiness certificates for newly produced 787 and 737 MAX aircraft.

A second directive issued at the same time covers 31 Boeing 747s. That order concerns wear between the inlet check valve and the inlet adapter in the horizontal stabiliser fuel tank, which the FAA says could also develop an ignition source. Both directives take effect on 7 December.

What it means for passengers

The 60 affected jets are a small share of the US Dreamliner fleet. United operates 97 Dreamliners, American operates 70 and Alaska operates six, and some foreign carriers fly under US registration too, so the worldwide total could be higher if other regulators follow suit.

Airlines are expected to fold the inspections into planned maintenance schedules where possible, so passengers should see little disruption. The order lands as US carriers reshape their long-haul fleets: JetBlue is cutting 13 international routes while building up Fort Lauderdale, and American Airlines is putting its 777 on 10 new routes, from Tel Aviv to Orlando.

It is the latest US aviation safety action to draw attention this week, after investigators found the tail of the Learjet that crashed in Florida had separated before impact.

What happens next

Operators must complete the inspections and any repairs required by the directive, with the 7 December effective date setting the clock running. The FAA retains the ability to require more immediate action if the inspections reveal widespread defects.

For now, the message from the regulator is measured: a production paperwork gap, a defined set of aircraft, and a fix that can be done on the ground — before a lightning strike ever tests it.