The Directorate General of Civil Aviation's (DGCA) continuing examination of the fuel control switches recovered from Air India Flight 171 has reportedly found no mechanical or electrical fault in the hardware itself, according to testing being conducted in Seattle. This update comes more than a year after the June 12, 2025 crash of the Boeing 787-8 shortly after takeoff from Ahmedabad, which killed 260 people and remains the deadliest accident involving a 787 to date. The preliminary report from India's Aircraft Accident Investigation Bureau (AAIB) had already disclosed that both engine fuel control switches transitioned from RUN to CUTOFF within roughly one second of each other during the initial climb, starving both engines of fuel at the worst possible phase of flight. The cockpit voice recorder captured one pilot asking the other why he had cut off the fuel, with a denial in response — an exchange that has fueled intense speculation about whether the switch movement was intentional, inadvertent, or the product of a system anomaly that investigators had not yet identified.
The significance of a "no fault found" finding on the switch hardware is that it narrows, rather than closes, the investigative aperture. If the physical switches, their locking mechanisms, and associated wiring test clean under controlled conditions in Seattle — likely involving Boeing, Honeywell (the switch manufacturer), and NTSB participation given the aircraft's US manufacture — it pushes the inquiry toward human factors, procedural, or maintenance-related explanations rather than a latent design defect. This is directly relevant to a 2018 FAA Special Airworthiness Information Bulletin that flagged a potential loss of the locking feature on similar fuel control switches across multiple Boeing models, including the 787. That bulletin was advisory rather than mandatory, and Air India, like many operators, had not performed the recommended inspections since compliance was discretionary. A clean test result on the recovered hardware doesn't necessarily exonerate the locking-feature concern industry-wide, but it does suggest the specific switches on this airframe were not exhibiting the wear-and-degradation failure mode the SAIB warned about.
For working pilots, this incremental finding carries weight well beyond the specifics of one accident. Fuel control switches sit in a category of cockpit controls assumed to be effectively immune to inadvertent activation — guarded, detented, and requiring deliberate lift-and-move action. If testing continues to rule out mechanical failure, the investigation inevitably keeps open the far more uncomfortable question of crew action, whether inadvertent or intentional, which has serious implications for CRM protocols, switch guarding design standards, and how manufacturers and regulators communicate risk. Crews flying 787s and other types with similar switch architecture have a direct stake in whether the FAA and Boeing eventually convert the 2018 bulletin into a mandatory airworthiness directive, and in how simulator and recurrent training programs address unexpected engine-out-both scenarios triggered by control inputs rather than component failure.
More broadly, this case has become a bellwether for how the industry balances advisory guidance against mandatory compliance following in-service safety signals. The gap between an FAA SAIB and a binding AD has drawn scrutiny before, and AI-171 is likely to intensify pressure for regulators to close that gap more aggressively when a plausible failure mode with catastrophic consequences has been identified, even absent statistical proof of an epidemic problem. The protracted, multi-agency nature of this investigation — AAIB leading with DGCA, Boeing, Honeywell, and NTSB technical support spanning facilities in India and the US — also underscores how modern transport-category accident investigations increasingly hinge on painstaking hardware-level forensics conducted far from the accident site itself. Operators and pilot groups worldwide are watching for the final report not just to understand what happened over Ahmedabad, but to see whether it reshapes fuel switch design standards, maintenance bulletin enforceability, and cockpit procedures industry-wide.