What is the cause of an abnormal situation in which a ``human groan'' can be heard from the in-flight broadcast of an airplane?



Passengers boarding an American Airlines plane have reported a series of mysterious reports that ``human groans flow on the in-flight announcement.'' American Airlines explains that `` amplifier failure '' is the cause of moaning-like sounds, but because the reported sounds are too similar to `` human moaning '', the reason why moans are broadcast on the Internet There is a lot of speculation about.

Moans, groans taking over some American Airlines flight intercoms - Los Angeles Times
https://www.latimes.com/california/story/2022-09-24/moans-groans-taking-over-some-american-airlines-flight-intercoms

A mysterious voice is haunting American Airlines' in-flight announcements and nobody knows how - Waxy.org
https://waxy.org/2022/09/a-mysterious-voice-is-haunting-american-airlines-in-flight-announcements-and-nobody-knows-how/

You can check how the ``voice that sounds like a groan'' is played on the in-flight broadcast by playing the movie in the following tweet posted by actor Emerson Collins. Sounds like human groans such as 'Ah~' and 'Uaa~' have been broadcast many times, and Mr. Collins also reacts as if he was surprised. Also, after the moaning was broadcast, the crew said, ``We are aware of the very disturbing sound being broadcast and are working to resolve the issue,'' to reassure passengers. I also know what you are doing.




Collins' post above was dated September 23, 2022, and some of the reactions to the post above included, 'My wife and I had a similar experience when flying American Airlines in July. It sounded like a groan in excruciating pain.The crew said, 'This has happened before and we can't explain it.'・A similar phenomenon occurred on a flight from F. Kennedy International Airport to Los Angeles International Airport (American Airlines AA117), on an old Airbus A321, with a crew member who had boarded the same plane a few days earlier. said, ``The same thing happened.




An American Airlines spokesperson said, ``After a thorough inspection of the aircraft and sound system by our maintenance team, we determined that the audio in question was a mechanical problem with the amplifier.'' Speculation about the identity of the voice is rife on the Internet, as the voice in question resembles a human groan.

◆ Speculation 1: Wasn't the groan played from the display attached to the seat?
Many airplane seats are equipped with displays that allow you to enjoy music and movies during your flight. A theory was proposed that the groan was played from this display, but this theory is denied because the plane on which Mr. Collins boarded did not have a display.




Speculation No. 2: Wasn't the in-flight announcement system hacked?
If the groaning isn't a prank by the crew, it's possible someone hacked into the in-flight announcement system. However, as a result of analyzing the document of Airbus A321 by Mr. Cybergibbons , who is working as a reverse engineer, it turned out that the voice communication system of Airbus A321 consisted only of wired connection, making it difficult to hack. It is




◆ Speculation 3: Wasn't the medical intercom misused?
On the online bulletin board Reddit, a person who claims to be familiar with the electronic equipment installed in the aircraft said, ``There is a possibility that the microphone is connected to the medical intercom deployed in the aircraft via Bluetooth and is playing noise.'' I am developing my theory . However, there is also a post on Twitter saying, ``American Airlines does not use medical intercoms, and iPhones are used for medical-related communications,'' making it unclear whether medical intercoms can be abused. .




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