ATA 27

Nitrogen Bottle Service Life
The nitrogen storage bottles have a 24-year service life starting at the date of manufacture, NOT the date when it was placed in service as Israel Aircraft Industries (IAI) thinks and Chapter 5 states. Pacific-Scientific, who makes the bottles, issued a letter stating the life limit begins at date of manufacture. If you need a copy, let us know. The same criterion applies to any pressurized container carried on or in an aircraft such as portable fire bottles, oxygen bottles, etc. Next time the bottles are removed, enter the date of manufacture in the logbook.