American Airlines Flight 1006 Engine Fire at Denver (N885NN)

On March 13, 2025, American Airlines Flight 1006, a Boeing 737-823 registered as N885NN, diverted to Denver International Airport (DEN) after experiencing right-engine vibration indications shortly after takeoff from Colorado Springs Airport (COS). After landing and taxiing to the gate, a fire occurred in the area of the No. 2 (right) engine, and passengers and crew evacuated the aircraft. Federal investigators are examining the event, with particular focus on the right-engine fuel-system hardware findings, the post-landing fire sequence at the gate, and the evacuation outcome.

Accident Summary

What Happened

The NTSB preliminary report states that during takeoff from Colorado Springs, just before V1, the crew observed an exhaust gas temperature (EGT) over-temperature for the No. 2 (right) engine; after gear and flaps were retracted, the crew slightly reduced power on the right engine and the EGT condition returned within limits. During climbout, the captain noted high vibration indications for the right engine, the crew accomplished the high engine vibration checklist, contacted dispatch, and diverted to Denver. The flight reached 16,000 feet msl, then conducted a normal approach and landing at Denver.

After landing, the crew taxied to the assigned gate and shut down both engines; after shutdown, a fire ensued in the area of the No. 2 (right) engine. Denver airport operations video showed a trail of fluid leaking from under the right engine nacelle as the airplane taxied into the gate. The NTSB report states the fire was extinguished within about one minute by gate ramp personnel before airport rescue and firefighting vehicles arrived.

Flight attendants reported that soon after arriving at the gate they heard passengers yelling “fire” and “smoke” and observed smoke filling the cabin, after which an evacuation was initiated. Passengers used the L1 door (via the jetway), both left overwing window exits, and the R2 door; the report notes that the R2 slide deployed automatically when the R2 door was opened. The report also states that the L2 door was later found cracked open and maintenance discovered the escape slide jammed in the door, preventing operation.

Aircraft and Operational Context

The NTSB preliminary report identifies the airplane as a Boeing 737-823, N885NN, powered by two CFM56-7B turbofan engines. The flight was operated under Part 121 as a scheduled domestic passenger flight from COS to DFW with 2 flight crew, 4 cabin crew, and 172 passengers onboard. Twelve passengers sustained minor injuries, and the airplane received substantial damage.

The report notes that post-event examination found the flaps remained at zero following the event. During the evacuation, passengers who exited via the left overwing window exits were assisted off the wing using a combination of ground vehicles, ladders available in the gate area, and a belt loader.

Accident Investigation

As outlined in our overview of the NTSB investigation process, early investigative work typically focuses on securing evidence, documenting the scene and damage, and collecting recorded data before deeper component examinations and analysis. In this event, the NTSB formed operations, powerplants, airworthiness, and survival factors groups and towed the airplane to a local maintenance hangar for examination.

The NTSB reported heat/smoke/burn indications near the right engine nacelle, right wing, right side of the fuselage aft of the wing, the right main landing gear, and the right main landing gear wheel well. On-scene examination of the right engine found all fan blades present, with one fan blade platform fractured, and identified multiple findings in the area of a fuel fitting and variable stator vane (VSV) hardware, including a loose lockwire installed in the incorrect direction and a VSV actuator rod end that was incorrectly fastened and secured, allowing fuel to leak.

The NTSB reported that the cockpit voice recorder and flight data recorder were sent to the NTSB laboratory for download and review, and that maintenance records for the right engine were reviewed, with selected components retained for further examination. The L2 slide was shipped to the manufacturer for detailed inspection and its maintenance log was to be reviewed.

Operational and Regulatory Issues

Events that begin with abnormal engine indications and end with a gate-area fire typically involve two related investigative tracks: the in-flight decision-making surrounding continuation versus diversion and the post-landing mechanical sequence that produces an on-ground fire. Here, the NTSB preliminary report documents the initial EGT over-temperature and subsequent high vibration indications on the right engine, followed by diversion, normal landing, and a fire after engine shutdown at the gate.

Evacuations at the gate and on the ramp can also create injury risk, particularly where overwing exits are used and passengers must be assisted down from the wing, or where slide deployment is impaired. The NTSB documented a jammed L2 slide that prevented its operation and described how overwing-exit passengers were assisted off the wing using available ground equipment. These operational details are commonly reviewed as part of survival factors analysis and procedural evaluation.

Aviation Accident Litigation

Separate from the safety investigation, passenger injury claims and other civil issues often require preservation of evidence and a careful, fact-driven review of maintenance practices, component condition, and the operational response, as discussed in our overview of aviation accident litigation. In an event involving a post-landing engine-area fire and evacuation injuries, the civil record can include engine maintenance and inspection documentation, component traceability, gate video, and passenger medical records, alongside the investigative record as it develops.

Depending on the facts established, evaluation may also involve the roles of multiple entities in the maintenance and oversight chain and how technical findings are documented and preserved, consistent with the types of issues reflected in our representative aviation matters. These questions are fact-dependent and should track the verified findings from recorded data and component examinations rather than early accounts.

Where matters resolve, outcomes commonly turn on technical causation proof and individualized injury documentation, as reflected in our collection of aviation verdict and settlement results. Broader context on how event type and injury severity can influence civil-case posture is discussed in our overview of aviation verdict trends.