Regulations & Safety
Air India Flight AI 315 APU Fire Incident Highlights Aviation Safety
Air India Flight AI 315 experienced an APU fire after landing in Delhi, triggering DGCA investigations amid recent safety concerns.
Air India Flight AI 315 Incident: A Closer Look at Aviation Safety and Operational Integrity
On July 22, 2025, Air India Flight AI 315, operating an Airbus A321 from Hong Kong to Delhi, experienced a fire in its auxiliary power unit (APU) shortly after landing at Indira Gandhi International Airport. The incident occurred during passenger disembarkation, prompting automatic safety systems to activate and extinguish the fire. Fortunately, all 158 passengers and crew members disembarked safely without injury.
This event, while contained, has drawn significant attention due to its timing, just one day after two other safety-related incidents involving Airlines Air India aircraft, and barely a month after the tragic crash of a Boeing 787 in Ahmedabad. With regulatory authorities like the Directorate General of Civil Aviation (DGCA) now investigating, the APU fire has become a focal point for broader discussions on aviation safety standards, airline accountability, and public confidence in India’s national carrier.
In this article, we examine the technical aspects of the APU system, the timeline and response to the incident, Air India’s recent safety record, and the wider implications for aviation safety both in India and globally.
Understanding Auxiliary Power Units (APUs)
What is an APU?
An Auxiliary Power Unit (APU) is a small turbine engine typically located in the tail section of Commercial-Aircraft. It provides electrical power and compressed air to aircraft systems when the main engines are off, especially during boarding, ground operations, or in-flight emergencies. The APU is essential for starting the main engines and maintaining critical systems such as air conditioning and cockpit electronics.
In the case of Airbus A321 aircraft, like the one involved in the Air India incident, the APU is designed with fail-safe mechanisms. These include automatic shutdown features and integrated fire suppression systems that activate in the event of abnormal heat or smoke detection.
Modern APUs are equipped with fire-resistant housing and sensors that monitor temperature, pressure, and fuel flow. These features are intended to minimize the risk of fire spreading and to ensure that any fire-related event is quickly contained.
“APU fires are typically minor. The housing contains built-in extinguishers, and cockpit controls allow manual suppression. This incident reflects robust system design, not systemic failure.” , Captain Mohan Ranganathan, Aviation Safety Expert
How APU Fires Occur
Though rare, APU fires can occur due to fuel leaks, residual fuel combustion, or mechanical failures. In this incident, technical experts suggested that residual fuel in the APU system after engine shutdown could have ignited, triggering the fire detection system. The automatic shutdown mechanism functioned as designed, preventing escalation.
Fire suppression systems in APUs are typically activated by sensors that detect high temperatures or smoke. In Airbus aircraft, the cockpit also allows pilots to manually discharge fire extinguishers into the APU compartment if needed.
This layered safety approach ensured that the incident remained isolated and did not impact passenger safety or airport operations. Nonetheless, it raises questions about maintenance practices and whether the APU had been inspected recently for potential fuel system issues.
Chronology and Immediate Response
Timeline of the Incident
Flight AI 315 landed at Delhi Airport at approximately 12:12 PM IST. As passengers began disembarking, smoke was observed near the aircraft’s tail section, prompting immediate concern. The APU’s built-in safety features automatically shut down the unit within seconds, and the onboard fire suppression system deployed successfully.
Airport fire and rescue teams were alerted and arrived promptly. However, by the time they reached the aircraft, the fire had already been extinguished by the aircraft’s internal systems. No external firefighting was required, and there was no damage to airport infrastructure or disruption to other flights.
Following the incident, the aircraft was grounded for inspection. The DGCA was notified and initiated a formal investigation to assess the cause of the fire and evaluate Air India’s compliance with maintenance protocols.
Operational and Technical Impact
The aircraft, registered as VT-PPJ, sustained damage localized to the APU compartment. While no passengers were harmed, the incident prompted a full technical review of the aircraft’s APU and fuel systems. The aircraft remains grounded pending the outcome of the investigation.
Air India reported the event as a “minor technical issue,” emphasizing that safety systems worked as intended. However, the incident adds to a growing list of safety-related events involving the airline, intensifying public scrutiny and regulatory oversight.
There were no delays or cancellations at Delhi Airport as a result of the incident, underscoring the effectiveness of the emergency response and containment protocols in place.
Air India’s Recent Safety Record
Multiple Incidents in a Short Span
The APU fire marks the third safety-related incident involving Air India within 48 hours. On July 21, 2025, a flight from Kochi to Mumbai veered off the runway during heavy rain, and another flight from Delhi to Kolkata aborted takeoff due to a technical fault. These incidents followed the June 12 crash of a Boeing 787 in Ahmedabad, which resulted in 274 fatalities.
These events have raised concerns about systemic issues within Air India’s operations. The DGCA has issued nine show-cause notices to the airline over the past six months, citing violations related to maintenance, crew scheduling, and safety documentation.
In June 2025, three senior officials were removed from crew scheduling duties after the DGCA found violations of flight duty time limitations, which could contribute to pilot fatigue, a known Safety risk.
Regulatory and Public Reactions
In response to the APU fire and other recent events, the DGCA has mandated inspections of all Airbus A320 and A321 aircraft operated by Indian carriers within 30 days. This measure aims to identify any recurring issues related to APU systems or maintenance practices.
Public confidence in Air India has been shaken, with a reported 17% drop in bookings within 48 hours of the APU incident. Industry analysts suggest that competitors may leverage this moment to highlight their own safety protocols.
The Tata Group, which acquired Air India in 2022, has invested heavily in rebranding and modernizing the airline. However, these incidents threaten to undermine those efforts unless systemic issues are addressed transparently and urgently.
Conclusion
The APU fire on Air India Flight AI 315 was effectively contained due to robust aircraft design and prompt emergency response. While it did not result in injuries or major damage, it occurred within a broader pattern of recent safety incidents that have put Air India under intense scrutiny.
Going forward, the airline must prioritize operational transparency, rigorous maintenance protocols, and compliance with regulatory standards. The DGCA’s ongoing investigation will be crucial in determining whether this was an isolated event or indicative of deeper systemic issues.
FAQ
What is an APU and why is it important?
An Auxiliary Power Unit (APU) provides electrical power and air conditioning when the main engines are off. It is also used to start the main engines and serves as an emergency power source.
Was anyone injured in the Air India APU fire?
No, all 158 passengers and crew members disembarked safely without any injuries.
What actions are being taken after the incident?
The DGCA has launched an investigation and mandated inspections of APU systems on similar aircraft across Indian carriers. The affected aircraft has been grounded for technical evaluation.
Sources: Livemint, NDTV, Economic Times, Hindustan Times, SKYbrary Aviation Safety, Pilot Institute, FlightGlobal
Photo Credit: Aviation A2Z
Regulations & Safety
FAA Launches MedGuide Medication Database for Aviators
The FAA launched MedGuide on Oct. 1, 2026, giving pilots and air traffic controllers an official tool to verify medication compliance.
The Federal Aviation Administration (FAA) launched an interactive online database on October 1, 2026, designed to help pilots and air traffic controllers determine whether specific prescription and over-the-counter medications are acceptable for flight duties.
Dubbed MedGuide, the platform addresses a longstanding information gap that previously required aviators to consult scattered third-party lists or contact Aviation Medical Examiners (AMEs) directly to verify medication compliance. The official release arrives as the agency faces mounting congressional pressure to modernize its aeromedical clearance processes and improve transparency for aviation professionals.
Navigating the new medication database
The initial release of the tool, designated as Version 1.0, intentionally includes only medications that the FAA categorizes as allowed for use during flight or safety-related duties. Users can search for specific pharmacological treatments to verify their compliance status and review any associated operational restrictions.
A core component of the new guidance is the formalization of wait periods. The FAA established a standard minimum wait time required before an aviator can return to the flight deck or radar screen after beginning a new treatment regimen.
“When starting a new medication, in most cases, a 48-hour wait time is required before returning to safety-related duties. This period allows the medication to take effect and ensures no aeromedically significant side effects develop,” the FAA stated in its official MedGuide documentation.
The agency explicitly noted that the presence of a medication on the allowed list does not automatically clear an aviator to fly. The underlying medical condition being treated must also be evaluated for clinical stability. The FAA stressed that the online tool is not intended to replace an individualized assessment by a certified AME.
Industry response to aeromedical transparency
Prior to the launch of MedGuide, pilots and air traffic controllers lacked a centralized, official, and public-facing database to check medication compliance. Aviators frequently had to rely on advisory services provided by industry associations or direct consultations with medical professionals. This fragmented approach often created uncertainty and administrative delays when aviators attempted to verify their medical status before applying for or renewing a medical certificate.
The National Business Aviation Association (NBAA) welcomed the new platform, noting that it provides the definitive guidance flight crews have long requested.
“Pilots are accustomed to clear, if-then directions, and MedGuide offers a more direct way to understand both prescription and over-the-counter medications, including any wait time after an initial or subsequent dose,” said Mark Larsen, Director of Safety and Flight Operations for the NBAA.
Larsen added that the tool equips aviators to make safe, fit-for-flight decisions about medication use, calling the database a significant step in the right direction for the industry.
Legislative mandates and rulemaking origins
The development of MedGuide by the FAA Office of Aerospace Medicine (AAM) stems directly from industry feedback and formal regulatory review. The AAM is responsible for the medical certification of all U.S. civil airmen and the medical clearance of air traffic control specialists, overseeing the national network of AMEs.
On April 1, 2024, the Mental Health and Aviation Medical Clearances Aviation Rulemaking Committee (ARC) issued a report to the FAA containing 24 specific recommendations. The committee identified a critical need for accessible, transparent medical information, which spurred the creation of the MedGuide platform.
The October 1, 2026, launch also coincides with significant legislative action in Washington. On September 24, 2026, the U.S. Senate passed the Aviation Medication Transparency Act of 2026 (S. 3258). The bipartisan bill requires the FAA to publicly list medications that aviation professionals can safely use, as well as those they should avoid, along with specific wait times.
On the same day, the Senate passed the John A. Hauser Mental Health in Aviation Act (S. 3257), which mandates the FAA to update mental health guidance and improve the efficiency of the Special Issuance Medical Certification process. Both bills are currently pending in the U.S. House of Representatives.
Over the next several months, the FAA plans to expand the MedGuide database in subsequent releases. Future iterations will include conditionally acceptable medications, prohibited medications, and guidance on additional underlying medical conditions.
AirPro News analysis
We view the launch of MedGuide as a necessary operational shift for the FAA Office of Aerospace Medicine. By publishing an official, public-facing database, the regulator is moving away from a historically opaque clearance process that often generated anxiety among aviators seeking routine medical care. The timing of Version 1.0 is highly strategic. Releasing the tool just days after the Senate passed S. 3258 allows the FAA to demonstrate proactive compliance with the core requirements of the legislation before it potentially becomes law.
Offloading routine medication queries to an automated, self-service system should incrementally reduce the administrative burden on Aviation Medical Examiners. By empowering pilots to independently verify the status of common over-the-counter and prescription drugs, AMEs and the AAM can theoretically redirect their resources toward processing the persistent backlog of complex Special Issuance cases.
Photo Credit: FAA
Regulations & Safety
FAA Proposes Torque Inspection AD for 980 Airbus Helicopters
FAA NPRM targets AS350, AS355, and EC130 helicopters over a nut retainer coating flaw that risks main rotor servo-control disconnection.
This is original reporting and analysis by AirPro News.
The Federal Aviation Administration (FAA) has proposed a new airworthiness directive (AD) mandating torque inspections on the main rotor servo-controls of 980 Airbus Helicopters AS350, AS355, and EC130 aircraft registered in the United States.
Published as a Notice of Proposed Rulemaking (NPRM) on October 19, 2026, the regulatory action addresses a mechanical vulnerability where paint or protective coating on a nut retainer can cause a loss of tightening torque. If left undetected, the FAA warns this condition could lead to the disconnection of the upper ball bearing end from the main rotor (MR) servo-control. Such a failure would result in a complete loss of helicopter control.
Inspection requirements and compliance timelines
The proposed directive targets specific members of the Airbus Helicopters Ecureuil family. The affected models include the AS350B3, AS355F, AS355F1, AS355F2, AS355N, AS355NP, EC130B4, and EC130T2 helicopters. Under the FAA proposal, operators must perform an initial inspection of the nut tightening torque on the upper ball bearing end of all MR servo-controls within 165 flight hours or six months, whichever occurs first.
The NPRM also outlines strict requirements for follow-up inspections to ensure ongoing safety. Any time an MR servo-control featuring an affected part is installed or reinstalled on an aircraft, maintenance personnel must conduct a subsequent torque check. This secondary inspection must take place between two and 10 flight hours after the installation is complete.
The FAA is accepting public comments on the NPRM through December 3, 2026. Following the closure of the comment period, the agency is expected to review industry feedback and issue a final rule mandating the inspections. The current regulatory action is classified as an interim measure. Airbus Helicopters is actively developing a permanent design change to the nut retainer that will eliminate the problematic paint or protective coating entirely, which will likely prompt further regulatory updates once certified.
Tracing the servo-control vulnerability
The engineering investigation that led to the current NPRM originated with a different Airbus Helicopters product line. In 2024, the European Union Aviation Safety Agency (EASA) received reports of two separate instances where torque was lost between the upper ball bearing end and the MR servo-control on Dauphin and EC155 helicopters. In one of those documented cases, the components completely disconnected in flight.
That discovery prompted EASA to issue an AD for the Dauphin family on June 6, 2024. The FAA subsequently mirrored that action with its own directive for U.S.-registered Dauphin helicopters on July 10, 2025. Following those initial reports, Airbus Helicopters launched a broader engineering analysis to determine the root cause of the torque loss. The manufacturer concluded that the presence of paint or protective coating on the lock washer and nut retainer compromised the friction required to maintain proper tightening torque over time.
During this investigation, the manufacturer determined that the AS350, AS355, and EC130 families share this exact design vulnerability in their main rotor flight control systems. In response to these findings, Airbus Helicopters issued Alert Service Bulletins on April 1, 2026, mandating torque checks across the affected Ecureuil fleet. EASA followed up by issuing AD 2026-0132 on July 8, 2026, to mandate the inspections for European operators. The FAA publication of the NPRM on October 19, 2026, aligns U.S. regulations with the European mandates.
Market context and fleet impact
The Airbus Helicopters Ecureuil family, currently marketed under the H125 and H130 designations, represents one of the most successful light utility helicopter programs in aviation history. Airbus Helicopters has delivered more than 7,200 Ecureuil family aircraft worldwide.
The large number of affected U.S. aircraft reflects the heavy utilization of the type across the country. The AS350 and EC130 platforms are heavily utilized across the aviation industry for critical missions, including law enforcement, emergency medical services, aerial firefighting, powerline maintenance, and passenger transport. The 980 helicopters of U.S. registry represent a significant portion of the active domestic rotorcraft fleet.
AirPro News analysis
The sheer volume of U.S.-registered aircraft affected by this NPRM highlights the industry reliance on the AS350 and EC130 platforms. With 980 airframes requiring initial and recurring torque checks, maintenance providers and fleet operators will need to carefully schedule these inspections to avoid grounding critical public service assets. Because the FAA 165-hour compliance window is relatively short for high-utilization operators like air medical and police units, we expect a rapid mobilization of maintenance personnel once the final rule is published. The recurring inspection requirement for newly installed parts will also add a layer of logistical complexity for maintenance, repair, and overhaul facilities until Airbus Helicopters can field its permanent hardware redesign.
Photo Credit: Airbus
Regulations & Safety
Istanbul to Host International Aviation Law Conference on Sanctions, Drones and AI
Hudson Morgan Williams’ International Aviation Law Conference, November 5–6, 2026, features former ICAO Council President Salvatore Sciacchitano as keynote speaker and six panels ranging from arbitration to eVTOLs.
The International Aviation Law Conference will take place in Istanbul, Türkiye, on November 5–6, 2026, bringing together aviation lawyers, regulators, academics and airline and airport executives. The event opens with an invitation-only gala dinner on Thursday, November 5, followed by a full conference day at the Çırağan Palace Kempinski on Friday, November 6. The organisers expect more than 300 attendees and more than 20 speakers.
The conference is organised by Hudson Morgan Williams, a London-based law firm, which describes it as the first Aviation Law Conference in Istanbul. AirPro News is a media partner of the conference.
Six panels, from arbitration to eVTOLs
The conference day opens with a panel on the future of aviation law and the role of arbitration courts, covering aircraft lease and financing disputes, aviation insurance and liability, and contract enforcement. A second panel looks at sanctions and their impact on aviation, including leasing and finance, compliance and jurisdictional challenges. A third turns to the integration of drones into global airspace, from defence and border-security drones to unmanned traffic management and passenger drones.
After the networking lunch, Salvatore Sciacchitano gives the keynote speech at 13:50. The afternoon panels cover how AI will shape the future of aviation, including liability, insurance and regulation; how smart airports and cost-effective airlines can make aviation cheaper to operate; and urban air mobility and eVTOL aircraft, with certification, vertiport regulation, passenger rights, insurance and noise on the agenda.
The organisers note that the programme and speakers are subject to change, and the line-up for each panel has not been announced yet.
Speakers
Sciacchitano led the ICAO Council from 2020 to 2025, a period that included the adoption of the long-term goal of net-zero carbon emissions for international aviation by 2050. He previously served as Executive Secretary of the European Civil Aviation Conference (ECAC) and as Deputy Director General of ENAC, Italy’s civil aviation authority, and is now an ICAO Goodwill Ambassador.
Güliz Öztürk has been CEO of Pegasus Airlines since 2022, after serving as the airline’s Chief Commercial Officer from 2010.
Speakers listed on the conference website also include:
- Selahattin Bilgen, CEO of İGA Istanbul Airport
- Utku Coşar, independent arbitrator and Vice President of the LCIA Court
- Prof. Dr. Elmar Giemulla, professor of aviation law and attorney in Berlin and New York
- Prof. Francesca Pellegrino, Professor of Air and Space Law at the University of Messina
- Haydar Yalçın, former Deputy Director General of Türkiye’s Directorate General of Civil Aviation
- Tasman Tam, barrister in Hong Kong
- Afgan Bakhishov, Advisor to the Chairman of Azerbaijan Airlines
- Mesut Yılmaz, eVTOL Program Director at Gözen Holding
Pegasus Airlines and Corendon Airlines are among the conference’s sponsors, alongside the Turkic Arbitration Association, the International Institute of Air and Space Law at Leiden University, Özyeğin University and Studio Legale Pierallini, with Argela as a supporter.
Why Istanbul
Istanbul is the home base of Turkish Airlines and Pegasus Airlines, and İGA Istanbul Airport ranks among Europe’s busiest airports. The city will also host the Istanbul Aviation Forum on April 27–28, 2027.
How to attend
Tickets for the conference day cost €250 per attendee, and the gala dinner is by invitation only. The full programme, speaker list and registration are available on the International Aviation Law Conference 2026 website.
The conference is also listed in the AirPro News Aviation & Aerospace Events Calendar 2026–2027.
Photo Credit: Hudson Morgan Williams
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