Falcon 2000
Maintenance Powerplant; Maintenance Airframe
Communication Breakdown; Situational Awareness; Training / Qualification
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Incorrect / Not Installed / Unavailable Part; Aircraft; Chart Or Publication; Human Factors
While accomplishing portable oxygen bottle 10-week cleaning of the bottle mask on a Dassault DA-2000 aircraft; I discovered that one of the passenger oxygen masks stowed with the portable oxygen bottle connector was wrong type. I immediately notified Management! Need to inspect [during] regular inspection that all masks in aircraft have same Part Number (P/N). Only difference on any [oxygen] mask is type of connector.  First-Aid mask has same type connector and approximately 15-feet [of hose] and a flow indicator on the mask. Suspect error [was] made during Oxygen System installation. Wrong type oxygen mask connector.
While cleaning a portable oxygen bottle mask on a company Dassault 2000 aircraft; a Mechanic discovered that one of the mask and hose assemblies stowed with the oxygen bottle had an incorrect connector.