Northrop 09641001 Voice Recorder Magazine 
Written by AnubisTTP on 2012-05-12  

Description

Many aircraft cockpit voice recorders had removable magazines such as this one for the storage of voice data. This recording magazine contains a spool of magnetic Mylar tape for the storage of voice data, much like the magnetic tape used in a consumer-grade cassette tape player. Unlike a conventional cassette player, the recording heads for this device are mounted within the magazine itself instead of the recorder, which prevents the tape from being exposed to dust and debris during installation and removal. The magazine contains two heads to double the capacity of the tape: one is used when the tape is running clockwise, and the other is used when the tape is running counterclockwise. The two reels of the tape are stacked one on top of the other to reduce space, a system of gears and springs controls the tension between the two reels as the direction of rotation changes. A small window on the top of the magazine allows the level of tape remaining to be seen without removing the cover.

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Northrop 09641001 in flight voice recorder magazine, shown with cover removed.


Northrop 09641001 in flight voice recorder magazine, underside. Note the crown gear for attachment of external drive motor.

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