New Delhi, India: India’s Aircraft Accident Investigation Bureau (AAIB) has recommended a comprehensive one-time inspection of airlines’ safety management systems (SMS) by the Directorate General of Civil Aviation (DGCA), following its 35-page final investigation report into a serious air proximity incident involving two IndiGo aircraft in Delhi airspace on November 17, 2023.
The incident involved IndiGo Flight IGO2113, an Airbus A321 operating from Delhi to Hyderabad, and IndiGo Flight IGO2206, an Airbus A320 operating from Delhi to Raipur. The two aircraft came dangerously close to each other shortly after departure, breaching the minimum separation standards mandated for controlled airspace. Fortunately, the Traffic Collision Avoidance System (TCAS) alerts helped pilots maintain safe separation, and no injuries or damage to the aircraft were reported.
The AAIB’s final report identified multiple factors that contributed to the near-miss. The crew of IGO2113 failed to correctly set up and verify the Standard Instrument Departure (SID) data, which is critical for maintaining a safe climb trajectory. In addition, monitoring during the climb phase was insufficient, leading to reduced vertical and lateral separation from IGO2206. The bureau also noted that six previous SID deviation events involving IndiGo aircraft between August and November 2023 had not been reported through mandatory safety reporting channels, highlighting weaknesses in both the airline’s internal safety culture and compliance with regulatory requirements.
In response to these findings, the AAIB has recommended that the DGCA carry out a one-time inspection of the safety management systems of all scheduled operators and the Air Navigation Service Provider. The goal is to evaluate the effectiveness of hazard identification, risk assessment, and reporting culture, as well as compliance with mandatory occurrence reporting.
The AAIB has also emphasized that airlines must ensure that all previous and future incidents are reported promptly and accurately to both the DGCA and the AAIB. The Airports Authority of India (AAI) has been advised to review ATC procedures, particularly during high-intensity simultaneous departures, and to assess the Short Term Conflict Alert (STCA) system and airspace design to prevent future separation breaches.
IndiGo has been recommended to take corrective action by ensuring accurate entries into the Flight Management and Guidance System (FMGS), minimizing cockpit disturbances during pre-flight setup, and strengthening cross-checks during training.
Aviation safety experts note that these recommendations are critical for maintaining operational safety, especially as India’s air traffic continues to grow rapidly. The AAIB’s recommendations focus on the importance of robust safety management system audits, procedural discipline, and a culture of compliance to prevent near-misses from escalating into accidents.
The DGCA is expected to follow up on the AAIB’s recommendations, potentially conducting targeted inspections across airlines and air navigation services to identify and rectify systemic vulnerabilities. The incident and the bureau’s final report highlight the vital role of near-miss investigations in reinforcing aviation safety, ensuring that lessons from minor incidents are institutionalized and preventive measures are implemented effectively.
![Washington, United States: A United Airlines flight bound for Guatemala City made an emergency diversion to Washington Dulles International Airport after a passenger allegedly attempted to open a cabin door at cruising altitude and assaulted another traveler, according to air traffic control communications and federal authorities. The incident involved United Airlines Flight 1551, operated by a Boeing 737 MAX 8, which departed from Newark Liberty International Airport on Thursday evening carrying 145 passengers and six crew members. The aircraft had been en route to Guatemala City when the crew declared an emergency and diverted to Washington Dulles International Airport in Virginia. According to audio between the flight crew and air traffic controllers, the pilot informed controllers that the disruptive passenger attempted to open Door 2L while the aircraft was cruising at approximately 36,000 feet. The pilot also reported that the passenger later assaulted another individual onboard. During the exchange, the tower asked the crew which door the passenger had attempted to access. The pilot responded: “Door 2L at 36,000 feet and then [the passenger] assaulted a fellow passenger.” When controllers asked whether there were any injuries onboard, the pilot replied: “Not to our knowledge.” The aircraft landed safely at Washington Dulles at approximately 8:38 p.m. local time. Law enforcement and emergency personnel met the aircraft upon arrival. The FBI later confirmed that agents responded to the incident at the airport, although the agency did not immediately release additional details regarding the passenger’s identity, possible charges, or whether the individual was taken into federal custody. Flight tracking data showed the aircraft remained airborne for a period before diverting toward the Washington region instead of continuing south toward Guatemala. The diversion temporarily disrupted the scheduled international service but no injuries among passengers or crew were officially reported. United Airlines had not issued a detailed public statement at the time of publication regarding the circumstances surrounding the diversion or the status of the passenger involved. Federal authorities are expected to review crew reports, passenger statements, and onboard evidence as part of the investigation.](https://aviationtoday.in/wp-content/uploads/2026/05/AVIATION-TODAY-UNITEDV-AIRLINES-RUDE-PASSENGER-768x432.jpg)
![Washington, United States: A United Airlines flight bound for Guatemala City made an emergency diversion to Washington Dulles International Airport after a passenger allegedly attempted to open a cabin door at cruising altitude and assaulted another traveler, according to air traffic control communications and federal authorities. The incident involved United Airlines Flight 1551, operated by a Boeing 737 MAX 8, which departed from Newark Liberty International Airport on Thursday evening carrying 145 passengers and six crew members. The aircraft had been en route to Guatemala City when the crew declared an emergency and diverted to Washington Dulles International Airport in Virginia. According to audio between the flight crew and air traffic controllers, the pilot informed controllers that the disruptive passenger attempted to open Door 2L while the aircraft was cruising at approximately 36,000 feet. The pilot also reported that the passenger later assaulted another individual onboard. During the exchange, the tower asked the crew which door the passenger had attempted to access. The pilot responded: “Door 2L at 36,000 feet and then [the passenger] assaulted a fellow passenger.” When controllers asked whether there were any injuries onboard, the pilot replied: “Not to our knowledge.” The aircraft landed safely at Washington Dulles at approximately 8:38 p.m. local time. Law enforcement and emergency personnel met the aircraft upon arrival. The FBI later confirmed that agents responded to the incident at the airport, although the agency did not immediately release additional details regarding the passenger’s identity, possible charges, or whether the individual was taken into federal custody. Flight tracking data showed the aircraft remained airborne for a period before diverting toward the Washington region instead of continuing south toward Guatemala. The diversion temporarily disrupted the scheduled international service but no injuries among passengers or crew were officially reported. United Airlines had not issued a detailed public statement at the time of publication regarding the circumstances surrounding the diversion or the status of the passenger involved. Federal authorities are expected to review crew reports, passenger statements, and onboard evidence as part of the investigation.](https://aviationtoday.in/wp-content/uploads/2026/05/AVIATION-TODAY-UNITEDV-AIRLINES-RUDE-PASSENGER-300x169.jpg)
