NASA Classifies Starliner Test as “Type A Mishap”; Boeing Cites Progress on Fixes

On February 19, 2026, NASA released its final investigation report regarding the Boeing Starliner Crewed Flight Test (CFT). The agency has retroactively classified the mission, which launched in June 2024 and concluded with an uncrewed return in September 2024, as a “Type A Mishap.” This classification represents the agency’s most serious category for accidents or close calls, defined by the potential for loss of life, permanent disability, or property damage exceeding $2 million.

In response to the findings, Boeing issued an official statement acknowledging the investigation and detailing the corrective measures implemented over the last year and a half. The report outlines 61 formal recommendations addressing technical, organizational, and cultural issues that contributed to the mission’s anomalies.

Investigation Findings: Technical and Cultural Failures

The independent investigation team identified specific root causes for the technical failures that plagued the Starliner spacecraft as it approached the International Space Station (ISS). According to the report, five of the 28 Reaction Control System (RCS) thrusters failed during docking, and multiple helium leaks were detected in the propulsion system.

Root Cause: Teflon “Poppets” and Overheating

The investigation determined that the primary cause of the thruster failures was the extrusion of Teflon “poppets,” or seals, inside the oxidizer valves. The report states that the frequent pulsing required for docking maneuvers caused the thrusters to overheat. This thermal stress caused the Teflon material to expand, blocking the flow of propellant.

Additionally, the helium leaks were traced to seals within the Propulsion system that were insufficient for the environmental conditions and oxidizer exposure. The report noted a critical lack of redundancy, stating that these failures left the spacecraft with no fault tolerance in its propulsion system during key mission phases.

Organizational Oversight

Beyond hardware, the investigation criticized the oversight culture shared by NASA and Boeing. The report described NASA’s approach as “limited touch,” suggesting the agency lacked sufficient insight into Boeing’s subsystems. It also highlighted a “normalization of deviance,” noting that both organizations had accepted unexplained anomalies from previous uncrewed flight tests (OFT-1 and OFT-2) without identifying definitive root causes.

Boeing’s Response and Corrective Actions

Following the release of the report, Boeing emphasized its cooperation with the inquiry and the work performed since the test flight concluded. In an official statement, the company said:

“We’re grateful to NASA for its thorough investigation and the opportunity to contribute to it. In the 18 months since our test flight, Boeing has made substantial progress on corrective actions…”

The “18 months” referenced by Boeing corresponds to the period between the uncrewed return of the Starliner capsule in September 2024 and the report’s release in February 2026. During this time, the company has implemented several engineering changes to address the 61 recommendations.

Hardware and Software Redesigns

According to details confirmed by NASA’s Commercial Crew Program, Boeing is redesigning the thruster pods, known as “doghouses.” These modifications include:

• Thermal Barriers: New insulation and thermal shunts have been added to isolate individual thrusters, preventing heat soak from affecting neighboring valves.
• New Seal Materials: The helium system is being upgraded with new seal materials designed to withstand the oxidizer environment.
• Software Updates: Flight Software has been updated with new “pulse profiles” to reduce heat buildup during complex maneuvering.

Boeing has reportedly conducted extensive ground Test-Flights of these new configurations at NASA’s White Sands Test Facility.

AirPro News Analysis

The retroactive classification of the CFT mission as a “Type A Mishap” underscores the severity of the risk faced by astronauts Butch Wilmore and Suni Williams, who ultimately returned on a SpaceX Crew Dragon in March 2025. While hardware redesigns address the immediate mechanical failures, the report’s focus on “silencing dissent” and “normalization of deviance” suggests that the path to recertification will require significant cultural shifts alongside engineering fixes. NASA has indicated that the next Starliner mission will likely be an uncrewed cargo flight, targeted for no earlier than April 2026, to validate these changes before astronauts fly on the vehicle again.

Sources

Sources: Boeing Official Statement, NASA Investigation Report (Feb 19, 2026), NASA Commercial Crew Program Updates.