If your operation includes Gulfstream’s newest G700 or G800 jets, check your logs before the next flight. The FAA has officially codified AD 2026-13-51, a final rule reacting to serious hardware defects found on two factory-fresh airframes with under 1,100 flight hours.

‍Field Notes: During an inspection of a G700 with just 1,056 flight hours, technicians found a broken hollow pin cap on the right-side engine aft thrust strut mount interface because a critical sleeve bushing was missing from the joint and had come loose inside the engine pylon. A subsequent production audit caught a second aircraft failing a gap check at the forward thrust strut interface after only 551 flight hours. Both airframes had previously had their engine thrust struts disconnected during production retrofit activities before entering service. The sleeve bushing normally fills the gap beneath the pin's cap, keeping it properly seated. Without it, that gap nearly doubles, from roughly 0.13"–0.15" to 0.23"–0.25", leaving the pin free to move under thrust loads until it eventually broke. Before further flight, operators must perform a detailed visual inspection of the left and right engine mount interfaces for paint abrasion, gouging, or structural distress, and physically verify that the sleeve bushing, nut, washers, and cotter pins are properly secured. Because an improperly secured thrust strut can compromise the entire mount system, this AD applies strictly to certain Model GVIII-G700 and GVIII-G800 serial numbers.

‍Why It Matters: This AD is a case study in why "brand new" doesn't automatically mean "flawless." In aviation maintenance, we typically associate engine separation risks and structural failures with aging airframes, corrosion, or high-time fatigue, but this AD turns that assumption on its head, serving as a reminder that production environments are just as vulnerable to assembly anomalies. It shows that the most critical inspection points aren't always obvious; they are the basic mechanical pins, nuts, and bushings mounting the engines. Check AD 2026-13-51 in TBX to confirm your serial number is in scope and track your inspection compliance before your next flight.

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