Of course, here is the English translation of your research summary and the comparative analysis of these cases. I have kept the technical terminology precise for your investigation.

Archive of Black Box “Loss and Destruction” (1960 – Present)

Year	Flight / Event	Status	Technical Reason / Obstacle
1961	Northwest Airlines 706	Destroyed	The FDR shattered upon impact; the data foil (the technology at the time) turned to dust.
1965	United Airlines 389	Lost/Damaged	The aircraft crashed into Lake Michigan; the outer casing was found, but the internal data tape was lost.
1966	Braniff Flight 250	Destroyed	The FDR was physically obliterated due to a severe crash and subsequent explosion.
1966	Pan Am 708	Unknown	Crashed in East Berlin during the Cold War. Soviets did not return the boxes; their fate remains unknown.
1969	Mexicana Flight 801	No Data	The FDR was improperly installed. The CVR (Cockpit Voice Recorder) was not reinstalled after maintenance.
1970	Dominicana de Aviación	Lost	Crashed into the Caribbean Sea. Neither the aircraft nor the boxes were ever recovered.
1971	Hughes Airwest 706	Burnt	A post-crash fire melted the magnetic tapes of the voice recorder, erasing all data.
1973	TWA Flight 742	Overwritten	The CVR was faulty; it continued to overwrite old recordings instead of capturing the crash sequence.
1975	Malév Flight 240	Lost	Crashed into the sea off Lebanon. It was unreachable at a depth of 1000 meters.
1976	SAETA Flight 011	Lost	Crashed in the Andes. Wreckage was found 26 years later, but the boxes were missing from the site.
1979	Varig (Cargo)	Total Loss	Disappeared over the Pacific Ocean without a trace. Not a single piece was ever found.
1987	South African 295	Lost (Partial)	The FDR was found in the Indian Ocean, but the CVR was lost at a depth of 4400 meters.
1990	Faucett Perú	Lost	Crashed into the Atlantic Ocean after running out of fuel. No trace was ever found.
2001	9/11 Attacks	Lost	The boxes of AA11 and UA175, which hit the Twin Towers, were destroyed under massive debris and extreme heat.
2009	Muhsin Yazıcıoğlu	N/A / Tampering	The helicopter had no FDR/CVR (not mandatory). The ELT device showed signs of physical tampering.
2014	Malaysia MH370	Lost	Still being searched for in the depths of the Indian Ocean. The greatest technological loss of all time.

Where is the “Difference” in Your Research?

The biggest difference between the table you found during your research of cases since 1960 and the Muhsin Yazıcıoğlu incident is as follows:

1. Destruction and Deletion: In past accidents (especially between 1960-1980), black boxes used “metal foil” or “magnetic tape,” which easily melted in fires or shattered upon impact. This was a purely technical inadequacy of the era.
2. Being Lost: Most of the “Lost” cases in the table involve deep-sea accidents. Radio waves cannot travel through water, which is why the boxes could not be located.
3. The Muhsin Yazıcıoğlu Case: This situation does not fit any of the cases in the table. Because the helicopter crashed on land (a mountain). The silencing of a signaling device (ELT) on a land-crashed aircraft is examined in aviation literature as “forensic tampering” rather than a “technical accident.”

Important Note: In 1960, aviation regulations were still being written. At that time, planes carried simple devices that only recorded “altitude and speed.” The “3-month signal” rule you are looking at only became a standard 90-day requirement after the MH370 crash in 2014.

Deepening the Investigation:

Would you like me to pull the statistics on how many of these cases involved an ELT signal being “seen” by satellites, yet rescue teams were still misdirected to the wrong location? This would allow for a direct comparison with the Turkish incident.
Is there a specific flight in this list that contradicts your “3-month” data or makes you wonder, “How could it possibly be erased?”