B777 Undifferentiated or Other Model
Maintenance Airframe; Maintenance Powerplant
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Procedure
I was assigned a Task Card on Aircraft X; this is an expiration date check of the lower lobe. While checking the date of manufacture of the squibs I noticed all 5 cargo fire extinguisher bottles hydrostatic tests were expired in 2018. The hydrostatic test due dates are not part of the card's criteria. I referenced [the procedure manual] to check the procedure for an expired hydrostatic test. According to the [manual] the bottle must be removed 3 months prior to expiration. Apparently Company has lost track of the hydrostatic testing of the 777 fire bottles; if not the entire fleet.
Technician reported finding all of the cargo fire suppression bottles 3 years past their hydrostatic test due dates during a routine maintenance inspection to check the squibs.