Regulations & Safety
NTSB Identifies Engine Design Flaw in Southwest Flight 554 Incident
NTSB finds a design flaw in Boeing 737 MAX engines causing smoke in cabins after bird strikes; software fix expected by early 2026.

This article is based on an official final Report from the National Transportation Safety Board (NTSB).
NTSB Identifies Engine Design Flaw in Southwest Flight 554 Smoke Incident
The National Transportation Safety Board (NTSB) has released its final report regarding a December 2023 incident involving Southwest Airlines flight 554. The investigation concluded that a bird strike during departure from New Orleans triggered a specific safety mechanism in the Boeing 737 MAX’s engines, which inadvertently caused oil to leak into the engine core and pump smoke into the cabin.
According to the NTSB’s findings, the incident highlights a design characteristic in the CFM International LEAP-1B engines used on the 737 MAX fleet. While the safety mechanism, known as the Load Reduction Device (LRD), functioned as intended to protect the engine structure, its activation created a hazardous environment for the flight crew and passengers by contaminating the aircraft’s air supply.
Incident Sequence and Crew Response
On December 20, 2023, Southwest flight 554 departed Louis Armstrong New Orleans International Airport (MSY) bound for Tampa, Florida. The Boeing 737-8 (MAX), registered as N8830Q, was carrying 139 passengers and crew.
The NTSB report details that during the initial climb at approximately 1,000 feet, the aircraft struck a bird, which was ingested into the left engine (Engine No. 1). The flight crew reported hearing a “thump,” followed immediately by severe vibration and a loss of thrust.
Shortly after the impact, the situation escalated significantly. The report notes that the flight deck and passenger cabin began to fill with smoke.
The smoke became thick enough to obscure the pilots’ view of the instrument panel, creating a high-workload emergency environment.
Despite the visibility challenges, the crew successfully declared an emergency, shut down the damaged engine, and returned to MSY for a safe landing. No injuries were reported among the passengers or crew.
Technical Analysis: The Load Reduction Device
The core of the NTSB’s investigation focused on why a standard bird strike resulted in a smoke event capable of obscuring pilot vision. Investigators determined that the bird impact fractured a fan blade, creating a significant imbalance in the engine.
This imbalance triggered the Load Reduction Device (LRD). The LRD is a safety feature designed to mechanically disconnect the fan from the rest of the engine during severe vibration events to prevent catastrophic structural failure. However, the NTSB discovered an unintended consequence of this activation.
According to the final report, when the LRD activates, it can compromise the engine’s oil sealing. This allows oil to flow into the hot core of the engine, where it vaporizes. Because the engine’s bleed air system, which supplies air for cabin pressurization and air conditioning, remained open, this vaporized oil was ingested and distributed throughout the aircraft as “acrid white smoke.”
A Pattern of Failure
The NTSB emphasized that the event involving flight 554 was not an isolated occurrence. The investigation cited a nearly identical incident on March 5, 2023, involving Southwest Airlines flight 3923 departing from Havana, Cuba.
In the Havana incident, a bird strike also triggered the LRD on a LEAP-1B engine. The result was similar, with “vapor fog” filling the cabin and flight deck. This pattern suggests a systemic integration issue between the engine’s structural protection systems and the aircraft’s environmental control systems.
Regulatory Actions and Future Mitigations
In response to these findings, the NTSB has issued urgent safety recommendations to the Federal Aviation Administration (FAA), Boeing, and engine manufacturer CFM International. The primary goal is to prevent smoke from entering the fuselage during future LRD activation events.
CFM International and Boeing are currently developing a software update for the LEAP-1B engine control system. This update is designed to automatically close the Pressure Regulating Shutoff Valve (PRSOV) whenever the LRD is activated. The PRSOV controls the flow of bleed air from the engine to the cabin; closing it immediately would prevent oil smoke from entering the aircraft’s air conditioning packs.
However, the NTSB report indicates that this permanent fix will not be immediate.
The software fix is anticipated to be available for retrofit by Q1 2026.
Until the software update is deployed, pilots must rely on interim procedures. The NTSB noted that updated guidance has been issued via Flight Crew Operations Manual bulletins, instructing pilots on how to manually manage air conditioning packs during potential engine failure scenarios to minimize the risk of smoke inhalation.
AirPro News Analysis
The timeline for the proposed software fix, slated for the first quarter of 2026, raises questions about the interim management of this risk. With bird strikes being a common aviation hazard, the reliance on manual pilot intervention to prevent cockpit smoke adds to the cognitive load during high-stress takeoff emergencies.
While the LRD is critical for preventing structural catastrophe, the potential for pilot incapacitation due to smoke is a severe secondary risk. The NTSB’s classification of this as an “Urgent Safety Recommendation” underscores the severity of the issue. Operators of the 737 MAX will likely face increased scrutiny regarding their adherence to the interim manual procedures until the automated software solution is certified and installed across the global fleet.
Frequently Asked Questions
What is the Load Reduction Device (LRD)?
The LRD is a safety mechanism in the CFM LEAP-1B engine designed to disconnect the fan from the engine core during severe imbalances (like a fan blade fracture) to prevent structural damage to the wing or fuselage.
Did the engines fail?
The engine experienced a fan blade fracture due to a bird strike and was subsequently shut down by the crew. The smoke issue was a secondary effect caused by the safety system (LRD) allowing oil to leak into the air supply.
Is the Boeing 737 MAX safe to fly?
The FAA and NTSB have not grounded the fleet. The issue is specific to a rare failure mode involving bird strikes and LRD activation. Interim procedures are in place to help pilots manage the air conditioning systems if such an event occurs.
Sources
Regulations & Safety
India’s New Aviation Rules Recognize Fractional Aircraft Ownership
India’s Bharatiya Vayuyan Niyam, 2026 recognizes fractional aircraft ownership and replaces the Aircraft Rules, 1937 from January 1, 2027.

India’s new civil aviation rulebook, the Bharatiya Vayuyan Niyam, 2026, recognizes fractional ownership of aircraft, allowing one aircraft to be jointly owned as long as responsibility for its operation and maintenance is clearly identified. The rules take effect on January 1, 2027, and replace the Aircraft Rules, 1937, which served as the country’s principal aviation rulebook for decades.
The provisions were set out in a backgrounder posted on November 4, 2026, by the Government of India’s Press Information Bureau (PIB), citing the Ministry of Civil Aviation. The government notified the new rules under the Bharatiya Vayuyan Adhiniyam, 2024, the act that provides the legislative basis for the overhaul. According to the PIB, the Niyam comprises 220 rules organized into eight chapters and six schedules.
What the rules say about fractional ownership
The PIB document says the rules allow shared investment in an aircraft under arrangements that identify who is responsible for its operation and maintenance. The same section regulates aircraft imports, fractional ownership arrangements and private aircraft operations, and it states that private aircraft cannot be used for hire or reward except as permitted under the rules. The PIB summary does not give further detail on how fractional arrangements must be structured.
Registration rules sit alongside the ownership provisions. Aircraft may be registered under Category A or Category B, depending on prescribed ownership, citizenship, business registration and leasing criteria. Any change in an aircraft’s ownership or lessor must be reported immediately, and further flying is restricted until the registration requirements are met, unless the Directorate General of Civil Aviation (DGCA) grants written permission. Aircraft must display the nationality mark “VT”, followed by a hyphen and three assigned capital letters.
Leasing, deregistration and export
The government links the new rules to its aircraft leasing framework. The Protection of Interests in Aircraft Objects Act, 2025, which grew out of India’s Cape Town aircraft leasing bill, implements the Cape Town Convention framework in India. According to India Code, the government’s legislative database, the act (Act No. 17 of 2025) was enacted on April 16, 2025, came into force on May 1, 2025, and gives effect to the Cape Town Convention on International Interests in Mobile Equipment, signed on November 16, 2001, and its Aircraft Protocol.
Under the new rules, eligible applications from holders of an Irrevocable De-registration and Export Request Authorisation (IDERA) to cancel a registration must be processed within five working days. The rules also provide for the export of aircraft after deregistration. The PIB says that, over time, this may help reduce aircraft acquisition and leasing costs and ease pressure on airfares.
Fares, crews and penalties
For airlines, the rules require tariffs to be set on factors including operating costs and published digitally, and scheduled operators must submit their tariffs to the DGCA for monitoring. Booking websites and tickets must show the total amount payable and a breakdown of fares, taxes, fees and other charges. In extraordinary situations, the central government may issue proportionate, time-bound directions in the public interest.
Crew provisions cover flight and duty-time limits, minimum rest and fatigue management. Crew members may not consume alcohol or specified intoxicants within 12 hours before a flight. For cabin crew, the rules set a minimum of one member for aeroplanes with 10 to 50 seats and helicopters with 20 to 50 seats, two members for aircraft with more than 50 seats, and one more for every 50 seats or part thereof beyond 99 seats. No cabin crew member may serve on more than three aircraft types.
Personnel licensing spans 23 categories of licences, ratings and certificates for pilots, flight engineers, aircraft maintenance engineers, air traffic controllers and radio-telephone operators. On enforcement, the PIB lists 21 punishable offences carrying imprisonment of up to two years, a fine of up to ₹1 crore, or both, plus 18 compoundable offences. A graded penalty structure with ten severity levels sets monetary penalties from ₹10,000 to ₹1 crore, depending on the contravention and the size of the offender.
Design approval and the wider market
The rules also give the DGCA a defined framework for aircraft design and certification. It may issue type certificates for aircraft, engines and propellers where India is the State of Design, validate or accept foreign type certificates, and authorize the design and manufacture of aircraft components. Draft airworthiness directives are generally published on the DGCA website for 30 days for comment, subject to exceptions.
The PIB places the rewrite against the growth of India’s airport network, which it says rose from 74 operational airports in 2014 to 166 as of October 2026. The rules also allow the central government to set up a Regional Air Connectivity Fund for viability gap funding, which may be financed by a levy on domestic scheduled flights. The new rules replace Part IX of the Aircraft Rules, 1920, as well as the 1937 rules, and come into force on January 1, 2027.
Regulations & Safety
FAA Lifts Nationwide Ground Stop as Some Departures Resume
The FAA lifted its nationwide ground stop of November 13, 2026, and said some departures are resuming after it tested its systems.

The Federal Aviation Administration (FAA) has lifted the nationwide ground stop it ordered on November 13, 2026, and some flight departures are resuming, the agency said in a statement on its official X account. The FAA said it tested its systems to confirm they were stable before it cleared flights to resume.
The statement does not give a time for the end of the stop or name a cause, and the FAA says its technicians are investigating. AirPro News reported on the FAA’s original ground stop order on November 13.
What the FAA said
“The safety of the flying public is always the FAA’s highest priority,” the agency said in its X statement. It said the ground stop had been lifted and that some departures were resuming.
The FAA said that before clearing flights to resume, it had tested its systems to confirm they were stable and that operations remain reliable. It told passengers to contact their airlines for flight updates.
The agency’s statement on the nationwide ground stop, published on the FAA website on November 13, says the stop was ordered after communication problems affected multiple Air Route Traffic Control Centers. “FAA technicians are investigating the issue,” the statement says. The FAA marks the statement as preliminary and subject to change.
What the command center advisory set out
Air Traffic Control System Command Center (ATCSCC) Advisory 111, time-stamped 20:54 UTC on November 13 and addressed to all aircraft operators, ground stopped all airports by order of the FAA command center, citing extraordinary circumstances and reasons of safety. It told operators that all departing traffic should remain on the ground until further notice.
The advisory listed the scope of the stop as all airports and the reason as equipment and outage. It gave an event window from 20:53 UTC on November 13 to 04:00 UTC on November 14, and said inbound international flights would be managed on a case by case basis.
What officials said
Homeland Security Secretary Markwayne Mullin spoke to reporters at the White House on November 13, and Transportation Secretary Sean Duffy also addressed the ground stop, The Associated Press reported. According to the AP, Trump administration officials said new technology added to the air traffic control system had overloaded older systems, leading to “intermittent” communications and radar gaps.
Mullin said the FAA was installing “new equipment, new technology” and that it “was overwhelming the older system,” the AP reported. Asked whether a cyberattack could be ruled out, Mullin said: “There’s nothing completely certain right now. It doesn’t appear that way.” He said there were no “footprints” of an attack. The AP reported that officials were still searching for the cause.
Mullin said no one was in danger and that more than 3,000 flights were safely landed, according to the AP. Duffy said 3,500 airplanes were in the sky when the stop began, and added: “And last time I looked, we had less than 400 in the airspace.” According to the AP, Duffy said he could not guarantee that it would not happen again.
Diversions and recovery
The AP reported that the ground stop was lifted on the night of November 13 after about five hours, and that limited domestic departures resumed that evening. About 11,000 flights carrying more than 1.5 million passengers had been scheduled to depart U.S. airports after 4 p.m. EST on November 13, according to the AP.
Citing Cirium data, the AP reported that at least 827 flights were diverted. As of 7:05 p.m. EST, 670 had been sent back to their departure airports and 157 had been redirected to other airports.
The AP reported that aircraft and crews were out of position after the stop and that a full recovery was expected to take days. Duffy said NCAA teams would be prioritized for travel to football games. Cargo flights were also delayed, and FedEx said it was prepared to activate contingency plans, according to the AP, which cited Airlines for America figures showing that U.S. airlines move about 61,000 tons (55,340 metric tonnes) of goods each day.
What comes next
The FAA has said its technicians are investigating and that it will provide updates. According to the AP, officials expect normal operations in time for the Thanksgiving travel rush.
Regulations & Safety
FAA Orders Ground Stop at All Airports After Telecommunications Outage
The FAA ordered all airports ground stopped on November 13, 2026, citing a temporary telecommunications outage and reasons of safety.

This is a developing story. Information may change as official details are released.
The Federal Aviation Administration (FAA) ordered all airports ground stopped on November 13, 2026, after what the agency described as a temporary telecommunications outage. An advisory from the FAA’s Air Traffic Control System Command Center (ATCSCC) set the start of the ground stop at 20:53 UTC (3:53 p.m. EST) and told operators that departing traffic should remain on the ground until further notice.
In a statement posted on its official account on X on November 13, 2026, the FAA said:
“There has been a temporary telecommunications outage – out of an abundance of caution all flights have been halted. Every flight has been accounted for and international flights will be handled on a case by case basis.”
What the command center advisory says
ATCSCC Advisory 111, time-stamped 20:54 UTC on November 13, is addressed to all aircraft operators. It states that, by order of the command center, all airports are ground stopped “due to extraordinary circumstances and for reasons of safety.”
The advisory’s summary table lists the scope as all airports and the reason as equipment/outage. It gives an event window from 20:53 UTC on November 13 to 04:00 UTC on November 14 (11 p.m. EST on November 13), lists 04:00 UTC as the time of its next update, and says inbound international flights will be managed on a case by case basis.
A follow-up operations plan, ATCSCC Advisory 112, time-stamped 21:02 UTC, carried the national ground stop forward with an event time of 21:00 UTC “and later.” It repeated that all departing traffic should remain ground stopped until further notice.
What the FAA has not yet said
The FAA’s statement does not say where the telecommunications outage occurred, which systems or facilities were affected, or when departures are expected to resume. The FAA has not stated the cause of the outage.
Neither advisory gives the number of flights held on the ground or airborne when the order took effect. The FAA’s statement says every flight has been accounted for. The command center’s advisory lists 04:00 UTC on November 14 as its next scheduled update.
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