DATA DIVE: Unexplained Fuel Pressure Spike Preceded Air India 171’s Fatal Crash

Data from the black box of Air India Flight 171, which crashed into the Arabian Sea on July 1, 2025, killing all 247 aboard, has revealed a critical anomaly: a sudden collapse in fuel pressure at 4,200 feet, accompanied by an unexplained momentary spike. The Boeing 787-9, en route from Delhi to London, lost power and plummeted after an uncommanded fuel cutoff. The flight data recorder (FDR), recovered from the wreckage 200 miles off Mumbai, shows the spike at 4:41:55 AM, just two seconds after the fuel system shut down, leaving investigators puzzled and fueling speculation about the crash’s cause.

The FDR data, partially shared by India’s Directorate General of Civil Aviation (DGCA) on July 12, indicates that fuel pressure dropped from normal levels to near zero in under three seconds as the plane descended rapidly from 36,000 feet. The spike, a brief surge to 150% of normal pressure, occurred milliseconds before the collapse, defying known patterns of fuel system behavior. “This spike is an outlier,” said DGCA chief Vikram Singh. “It could indicate a mechanical failure, a software glitch, or something external. We’re working to understand it.”

The anomaly has drawn intense scrutiny, especially in light of a leaked safety memo warning of fuel system issues in the 787’s Full Authority Digital Engine Control (FADEC). The cockpit voice recorder captures Captain Anil Sharma’s confusion over an uninitiated fuel cutoff, suggesting the spike and collapse were not crew-related. On X, the hashtag #AI171Spike has trended, with users posting graphs of the FDR data and speculating about causes. One post, viewed 1.4 million times, suggested a cyberattack could have triggered the spike, while another pointed to a possible electrical surge in the FADEC.

Investigators are analyzing the wreckage’s fuel system components, recovered by salvage teams, to determine if a mechanical fault caused the spike. The 787’s complex avionics, which integrate fuel and engine controls, are also under review for software vulnerabilities. A source close to the investigation, speaking anonymously, noted that similar spikes were reported in two non-fatal 787 incidents in 2024, both attributed to faulty sensors. However, the scale of Flight 171’s spike—lasting just 0.2 seconds—sets it apart, with no clear explanation in Boeing’s technical manuals.

The public response has been fervent, with families of the victims demanding answers. “That spike changed everything,” said Priya Desai, who lost her sister on the flight. “We need to know what it means.” On X, aviation experts have called for a global review of 787 fuel systems, citing the crash as a potential “systemic failure.” Air India has grounded its 787 fleet, and Boeing has pledged full cooperation, though both face growing criticism over safety protocols.

As salvage operations continue, the unexplained spike remains a critical piece of the puzzle, with investigators hoping it will unlock the sequence of events that led to Air India 171’s tragic descent.