An unexpected roar altered the nocturnal silence of Alcalá de Henares on the nights of February 9 and 10 and opened a small enigma among those who heard it. Without a clear cause at that first moment, the noise began to be commented on social networksaccompanied by recordings of neighbors trying to find an explanation. That initial confusion marked the starting point of a story that, as the hours passed, began to receive answers from the institutional level.
The official explanation. The uncertainty began to dissipate when the Consistory announced that He had contacted the Torrejón de Ardoz Air Base to clarify the origin of the noise. According to municipal sources after that consultation, this came from fuel tests carried out on an airplane. Eurofighter on the ground, motionless on the track during the test.
Why outdoors and at night? The explanation also goes through the place and time chosen for the rehearsals. According to the Air and Space Armythe measurements require the absence of solar radiation so as not to alter the infrared records, which is why they are carried out at night. At the same time, the tests are carried out outdoors, since the hangars available for engine tests are not sized for this model and this type of tests. With these conditions, it is coherent that its perception reached areas close to the base in certain circumstances.
The objective of the tests. Beyond the acoustic episode, the checks pursue a specific technical purpose: to evaluate whether the SAF biofuel has an infrared signature lower than that of the conventional fuel commonly used. This test is part of a verification campaign developed throughout the week, which is influenced by both the measurement procedure and the environmental conditions.
looking back. The Air and Space Army has been developing the BACSI project since 2020aimed at combining energy sustainability and operational digitalization within its air bases. Within this framework, different milestones have occurred, from the first tests with biojet mixtures in 2022 to the presentation of results at FEINDEF 2023 and the supersonic flights with SAF carried out in 2024, with fuel produced in Spain by Repsol and mixed at 30% with conventional fuel.
One more test. The last test is scheduled for the night of this Wednesday, February 11. This implies that the noise that surprised many residents could once again be perceived in the area near the base, although this time with an important difference: we now know where it comes from. What was a shared mystery for two nights is thus transformed into a concrete explanation, also linked to a technical process that points towards more sustainable fuels within military aviation.
Images | Air Force
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