Boeing is working through hundreds of microscopic cracks found in structural reinforcing members on the two Boeing 747-8 aircraft being converted into the next generation of Air Force One, and the US Air Force says the repair effort is currently on pace.
The defects sit in longitudinal structures known as stringers β the slender lengthwise members that run along the inside of the fuselage skin and, together with the circumferential frames, carry much of the load that keeps a pressurised tube rigid. On the two presidential airframes, those stringers are being replaced under procedures mandated by the Federal Aviation Administration. As of late July, roughly 300 stringer cracks had been identified on each aircraft.
Not a safety issue today, but a lot of extra work
Neither the Air Force nor Boeing has suggested the cracking makes the aircraft unsafe in their current state. The problem is scale. Replacing stringers is deep structural work: interior systems and linings have to come out, access has to be opened up, each part has to be removed and refitted to an approved procedure, and the whole job has to be inspected and signed off. Layering that onto an aircraft already stripped back for one of the most complex modification programmes in commercial aviation history is exactly the kind of task that eats months.
The cracking is not unique to the presidential jets. Microscopic stress cracks linked to corrosion have emerged across the wider 747-8 fleet, which prompted the FAA to mandate inspections and repairs at specified intervals. The two future VC-25B airframes are simply the most visible aircraft caught by that requirement.
A programme that has already cost Boeing billions
The Air Force One replacement effort was signed as a fixed-price deal, which means schedule slips and unexpected work land on Boeing rather than the taxpayer. The programme's overruns have now passed $3.1 billion, and Boeing has absorbed that bill. The ramp-up in production and certification resources alone cost the manufacturer an additional $280 million in the most recent quarter.
That figure is a reminder of how punishing fixed-price defence contracting can be when the work turns out to be harder than anyone modelled. Converting a widebody airliner into a flying command post means new electrical generation, hardened communications, medical facilities, self-defence provisions and a cabin layout that bears little resemblance to anything that rolls off a normal production line β all of it certified to a standard that leaves no room for shortcuts.
Mid-2028, more than three years late
The Air Force now expects to take the first aircraft in mid-2028. The original target was December 2024. Even so, the service has said Boeing's current progress on the stringer work does not represent a significant schedule risk, which suggests the repairs are being absorbed inside the existing plan rather than pushing it further right.
For Boeing, the calculation is straightforward and uncomfortable: finish the aircraft, take the loss, and protect a relationship that matters far beyond the two airframes involved. For the Air Force, the ageing pair of VC-25As currently in service continue to do the job they have done since 1990 β which is, in its own way, a testament to how well the original 747-200B conversions were built.
Sources: Simple Flying, Bloomberg. Featured image: AI-generated by AviationShop. By Marco Bianchi.
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