During a maintenance check on an A300 aircraft; the incorrect part number O2 masks were installed in...

Narrative:

Oxygen masks were pulled for installation on aircraft for completion of an engineering order (east.O.) by another member of the maintenance team. These sat on a bench until the second to the last day of the maintenance check. Due to the maintenance deferrals scheduled to be worked during the check; I had to complete much of the inspection and maintenance while my partner troubleshot the deferrals in-order to keep to schedule. (The last day we reserve for paperwork; parts ordering and taking inventory; except if it is needed to perform work on the plane.) this caused me to develop stress due to the additional workload put upon myself and also due to fatigue from having trouble sleeping.this situation caused me to trust my fellow teammate's selection of oxygen masks on the bench without verifying the part number (pn). Later; I discovered that the reason the wrong masks had been pulled for installation is that the masks for the A300 were intermixed with those for B767.the discrepancy was caught when the parts tag was processed and the masks were replaced. The masks for each aircraft are being kept separately from each other and each member of the team is now responsible for pulling his own parts.

Original NASA ASRS Text

Title: During a Maintenance Check on an A300 aircraft; the incorrect part number O2 masks were installed in the Cockpit. This occurred because O2 masks from a B767 were at the same location and the part numbers were not verified as to which masks were correct for this aircraft.

Narrative: Oxygen masks were pulled for installation on aircraft for completion of an Engineering Order (E.O.) by another member of the maintenance team. These sat on a bench until the second to the last day of the maintenance check. Due to the maintenance deferrals scheduled to be worked during the check; I had to complete much of the inspection and maintenance while my partner troubleshot the deferrals in-order to keep to schedule. (The last day we reserve for paperwork; parts ordering and taking inventory; except if it is needed to perform work on the plane.) This caused me to develop stress due to the additional workload put upon myself and also due to fatigue from having trouble sleeping.This situation caused me to trust my fellow teammate's selection of oxygen masks on the bench without verifying the Part Number (PN). Later; I discovered that the reason the wrong masks had been pulled for installation is that the masks for the A300 were intermixed with those for B767.The discrepancy was caught when the parts tag was processed and the masks were replaced. The masks for each aircraft are being kept separately from each other and each member of the team is now responsible for pulling his own parts.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1340158
Time
Date	201601
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Oxygen System/Crew
Person 1
Qualification	Maintenance Airframe Maintenance Powerplant
Experience	Maintenance Technician 27
Events
Anomaly	Deviation - Procedural FAR Deviation - Procedural Published Material / Policy

During a maintenance check on an A300 aircraft; the incorrect part number O2 masks were installed in the cockpit. This occurred because O2 masks from a B767 were at the same location and the part numbers were not verified as to which masks were correct for this aircraft.