B787 Dreamliner Undifferentiated or Other Model
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Human Factors; Procedure
Upon receiving three B787 oxygen bottles. I; Aircraft Maintenance Technician (AMT) in ZZZ inspected these bottles before putting them in service. This is normal practice in ZZZ. It was at this time I noticed one bottle was low; one was empty and the other was at 2000 psi (normal). My investigation revealed that all three bottles had damaged (bent) Gauges. ALL three is alarming to me. I have attached photos of all three bottles along with the Non-Rotable Parts tags. There needs to be an investigation to determine where the damage is occurring. And we need to check all B787s to determine if they are flying around with damaged bottles. Flight Deck Crew. Component.
Reporter stated flight crews have two oxygen bottles located in the Main Equipment Center (MEC) under the cockpit floor. Bottles are made of composite materials with a valve head on the bottle that is different from earlier composite bottles. Mechanics must shut off both bottles when servicing either bottle to prevent loss of oxygen from bottle not being serviced. Bottles have to be removed for oxygen servicing; requiring a two-person effort. No scratches or dents are allowed on any bottle.Reporter stated his air carrier went to an all metal box for transporting their oxygen bottles because they are shipped pressurized on aircraft with 2;000 pounds of pressure. The containers are designed to handle heat and bottle pressures. They recently identified the cause of the damaged oxygen gauges on the bottles to be from the plastic shipping containers that had previously been used to ship oxygen bottles by ground; but are still used for storing them. The B787 composite bottles were not secured in the plastic containers and would slide around inside. Damage to the bottle valve head and gauge was more likely to occur when the plastic box was stood up on one end. His air carrier has already accomplished a Fleet Campaign and found one bottle installed with the bent pressure gauge. Almost all of the bent; damaged bottle gauges were found to be leaking oxygen.
An Aircraft Maintenance Technician (AMT) reports finding three Crew Oxygen bottles with damaged (bent) pressure gauges during a Receiving Inspection procedure prior to putting the bottles in service. Concerns also raised as to where the damage had been occurring and whether other aircraft may be flying around with damaged bottles.