BREAKING: Air India171 Black Box Hints at Faulty Fuel Control Switch Tweaked Mid-Flight — Investigators Urgently Rechecking Recorders
New information suggests fuel control switches may have been incorrectly adjusted mid-flight — AAIB is reviewing black box information.

BREAKING: Air India 171 Black Box Hints at Faulty Fuel Control Switch Tweaked Mid-Flight — Investigators Urgently Rechecking Recorders

On June 12, 2025, Air India Flight 171, a Boeing 787-8 Dreamliner, crashed just 36 seconds after takeoff from Ahmedabad’s Sardar Vallabhbhai Patel International Airport, en route to London Gatwick. The disaster claimed 241 of the 242 people on board and 33 lives on the ground, marking the first fatal crash of a Boeing 787. Recent developments in the investigation, led by India’s Aircraft Accident Investigation Bureau (AAIB), have zeroed in on a critical clue: black box data suggesting that the aircraft’s fuel control switches were incorrectly adjusted mid-flight. This revelation, combined with cockpit camera footage and ongoing analysis of the Enhanced Airborne Flight Recorders (EAFRs), has prompted investigators to urgently recheck the recorders, reshaping the narrative around this tragic event.

The Crash and Initial Findings

Flight 171, carrying 230 passengers and 12 crew members, took off at 13:38 IST under the command of Captain Sumeet Sabharwal and First Officer Clive Kunder. Seconds after liftoff, the aircraft struggled to climb, reaching only 672 feet before issuing a mayday call: “No thrust, not taking lift.” By 13:39, it crashed into the B.J. Medical College hostel in Ahmedabad’s Meghani Nagar, causing multiple explosions and widespread devastation. The sole survivor, British national Vishwashkumar Ramesh, described witnessing the crew’s desperate attempts to save the aircraft.

Both EAFRs—combining the Cockpit Voice Recorder (CVR) and Flight Data Recorder (FDR)—were recovered on June 13 and 16, alongside a digital video recorder capturing cockpit footage. Initial analysis pointed to a possible dual-engine failure, an event considered statistically improbable for a modern aircraft like the 787, equipped with GE Genx-1B engines and redundant systems. Theories ranged from fuel contamination to flap misconfiguration, but a July 9 report from The Air Current shifted focus to the fuel control switches, suggesting improper, inadvertent, or intentional movement during the critical post-takeoff phase.

The Fuel Control Switch Anomaly

The Boeing 787’s fuel control switches, located in the throttle quadrant, have two positions: RUN and CUTOFF. These switches, guarded by brackets to prevent accidental movement, are typically adjusted only on the ground during engine start or shutdown. Moving a switch to CUTOFF mid-flight would halt fuel flow to the corresponding engine, causing immediate shutdown and loss of thrust, along with associated electrical generators. The black box data, as reported by sources familiar with the investigation, indicates that one or both switches may have been moved to CUTOFF shortly after takeoff, potentially explaining the sudden loss of thrust reported in the mayday call.

Cockpit camera footage, previously sealed in the AAIB report, captured First Officer Kunder’s rapid downward hand gesture toward the throttle quadrant at 12 seconds post-rotation, coinciding with a CVR recording of him saying, “The seat’s jammed… I can’t reach the throttles!” This suggests a possible link to a mechanical issue: Captain Sabharwal’s seat sliding backward due to a failed aft lock mechanism, disrupting his control inputs. The gesture, initially interpreted as an attempt to correct a perceived issue, may have inadvertently involved the fuel control switches, exacerbating the crisis.

The AAIB is now rechecking the EAFRs to confirm the precise timing and sequence of the switch movements, cross-referencing FDR data on switch positions, thrust settings, and engine performance with CVR audio and cockpit video. The recorders, though damaged by fire, yielded downloadable data on June 25 at the AAIB’s Delhi laboratory, with assistance from the U.S. National Transportation Safety Board (NTSB).

Re-evaluating the Black Box Data

The urgency to recheck the recorders stems from the complexity of the data and the need to rule out alternative causes. The FDR captures thousands of parameters, including fuel flow, engine health, and control surface positions, while the CVR, limited to two hours on this 2014-model 787, records pilot conversations and ambient sounds. Preliminary analysis could not conclusively determine whether the switch movement was intentional, accidental, or due to a mechanical fault, prompting a deeper dive into the raw data.

Investigators are also exploring whether a faulty fuel control switch or related system malfunction could have contributed. The Full Authority Digital Engine Control (FADEC) system, which monitors the 787’s Genx-1B engines, should have flagged any anomalies, but no such alerts were recorded. A prior case from 2020, involving a Titan Airways A321 with fuel contamination causing a dual-engine anomaly, is being reviewed as a potential precedent, though sabotage has been ruled out.

Implications and Industry Response

The focus on the fuel control switches has significant implications. If pilot action—whether inadvertent or intentional—caused the crash, it could highlight gaps in crew training for low-altitude emergencies. Posts on X reflect public sentiment leaning toward human error, with one user noting, “Human error is back at #1 cause for Air India 171 tragedy,” though no official memo from Boeing or GE suggests a design flaw. Conversely, a faulty switch or system failure could point to maintenance oversights, as Air India’s maintenance records show the aircraft’s right engine was overhauled in March 2025, with the left engine inspected in April 2025.

The AAIB’s preliminary report, due around July 11, 2025, under ICAO rules, will clarify these findings. Meanwhile, Air India has cut international widebody operations by 15% and completed safety inspections on 26 of its 33 Boeing 787s, with the Directorate General of Civil Aviation (DGCA) ordering additional checks on fuel systems and cockpit ergonomics. The FAA and EASA have mandated inspections of 787 pilot seat tracks, prompted by a similar incident in a 2024 LATAM Airlines 787 event.

A Human and Systemic Tragedy

The investigation underscores the interplay of human and technical factors. Captain Sabharwal, 56, and First Officer Kunder, 34, faced an impossible situation, with the CVR capturing their urgent attempts to regain control. The cockpit footage, showing Kunder’s gesture amid Sabharwal’s seat malfunction, humanizes their struggle. The crash, the deadliest in India since 1996, has devastated families, with 90 victims identified via DNA matching as of June 2025.

As the AAIB rechecks the black box data, the focus on the fuel control switches challenges initial theories of mechanical failure alone. Whether caused by a faulty system, an inadvertent action, or a maintenance oversight, the findings will shape aviation safety protocols, particularly for the 1,200 Boeing 787s in service worldwide. The sealed cockpit footage and ongoing recorder analysis hold the key to unraveling why Flight 171 fell from the sky, offering answers to grieving families and lessons for the industry.