# Sepehran Airlines aviation incidents in Iran > Live situation record from CLSTR: https://clstr.news/situations/sepehran-airlines-aviation-incidents-in-iran > Updated: 2026-09-20T00:56:25.000Z. Sources: 39. Developments: 3. Sepehran Airlines has experienced two separate aviation incidents involving Boeing 737 aircraft at Mashhad International Airport. On August 25, 2026, a Boeing 737-500 operating flight IS4310 from Tehran veered off the runway into an unpaved area after landing. All 127 passengers and crew were evacuated safely without injury. The Iran Civil Aviation Organization launched an investigation into the excursion, which resulted in the temporary closure of Runway 13R and Taxiway Q. On September 15, 2026, a Boeing 737-300 traveling from Mashhad to Kermanshah was forced to perform an emergency landing back at Mashhad Airport. While initial reports suggested a tire burst caused engine damage and debris, a subsequent investigation by the Iran Civil Aviation Organization identified the cause as an abnormal oscillation known as ‘Shimmy’ in the main landing gear. The investigation found that the Shimmy Damper was in poor condition due to ‘leakage, wear, and corrosion,’ which transmitted abnormal forces to other landing gear components. This caused intense vibrations, leading to detached ceiling panels and open overhead storage compartments. All passengers escaped the September 15 incident without injury. These events have raised significant concerns regarding aviation safety and maintenance in Iran, particularly as sanctions complicate the acquisition of authentic spare parts for aging fleets. Sepehran Airlines’ Boeing 737 models have an average operating age of approximately 32 years. ## Claims - Intense vibrations caused cabin ceiling panels and interior linings to detach and fall onto passengers. (corroborated by 20 sources) - The incident was not caused by the tires, contrary to initial reports. (corroborated by 19 sources) - No passengers or crew members were injured during the emergency landing. (corroborated by 17 sources) - The incident involved reported damage to one of the aircraft's engines. (corroborated by 14 sources) - One of the runways at Mashhad Airport was temporarily closed following the incident. (corroborated by 4 sources) - The average operating age of Sepehran Airlines' Boeing 737 fleet is 32.2 years. (corroborated by 3 sources) - The cause was an abnormal vibration known as Shimmy affecting the main landing gear. (corroborated by 2 sources) - The Shimmy Damper failed due to leaks, wear, and corrosion. (corroborated by 2 sources) ## Timeline ### 2026-09-20: Sepehran Airlines Boeing 737 makes emergency landing in Mashhad A Sepehran Airlines Boeing 737 made an emergency landing in Mashhad, Iran, after a tire detachment and intense vibrations caused cabin damage and passenger panic. No injuries were reported. 2 sources. https://clstr.news/cluster/sepehran-airlines-boeing-737-makes-emergency-landing-in-mashhad ### 2026-09-15: Sepehran Airlines Boeing 737 makes emergency landing in Iran A Sepehran Airlines Boeing 737 made an emergency landing in Mashhad, Iran, after intense vibrations caused cabin ceiling panels to fall. Investigators cited a faulty Shimmy Damper in the landing gear. 35 sources. https://clstr.news/cluster/sepehran-airlines-boeing-737-makes-emergency-landing-in-iran ### 2026-08-26: Sepehran Airlines Boeing 737 veers off runway in Mashhad A Sepehran Airlines Boeing 737 veered off the runway at Mashhad International Airport in Iran. All 127 passengers and crew evacuated safely with no reported injuries. 3 sources. https://clstr.news/cluster/sepehran-airlines-boeing-737-veers-off-runway-in-mashhad --- Cite as: Sepehran Airlines aviation incidents in Iran. CLSTR, https://clstr.news/situations/sepehran-airlines-aviation-incidents-in-iran