Narrative:

This [safety awareness program] is going to generate more than one problem!was assigned aircraft X lp 38XXXXX [oxygen system] unit robbed for aircraft Y. After getting possible need part from [company] went to aircraft and found that the entire [oxygen system] unit was missing. Part that was aog'd (aircraft on ground) in for aircraft was 80XXXX-xx. But the part was oxygen O2 generator MEL 25-XXXX-X-XXXX = 80XXXX-xx. But needed case also. Since the deferring station on aircraft Y removed unit. Per MEL card 35XXX # 35XXY replace or service or remove.note: affected unit may remain in place within storage location if unit is placarded.after finding no ipc (illustrated parts catalog) reference for the installed [oxygen system] single-pak's went looking in the configuration drawings. 25XXXXXXXX rev. B. I did find a reference for these units item xx = 80XXXX-xx = MEL 25-XXXX-X-XXXX = O2 generator not a complete unit. Then went to the cmm (component maintenance manual) vendor [oxygen system] systems (need to search for the [oxygen system] series 80XXXX) then select 35-xx-xx. Near the end section of the cmm is the vendor ipc. Item XXX = generator which is = 80XXXX-xy = MEL 25-XXXX-X-XXXY. Which is not allocated to stations. Then item xxy generator = 80XXXX-xz = MEL 99-XXXX-X-XXXX which is allocated to stations then item -X 80XXXX-xa [oxygen system] single-pak. This has a MEL 25-XXXX-X-XXXZ. But has it as non hazmat (hazardous materials) and a description of case; portable breathing unit without generator. But when you order this MEL you get a cannot ship from [company] people due to the generator is shipped with case.aircraft Y lp 37XXXXX. [Oxygen system] emergency seal broken.[maintenance] looked at unit found that it was activated (used) so they used MEL 35XXY. They removed unit and placarded storage location. Released aircraft. 8 days later aircraft at ZZZ somebody wants lp cleared. According to the other installed units it needs a 80XXXX-xx unit.but this is only a generator not a [oxygen system] unit. But this part is available in ZZZ1. So they aog it. After this they go looking for a aircraft that they can rob from. They find aircraft X they generate a lp 38XXXXX to show that they robbed the unit for aircraft Y. Now this is a MEL swap to another aircraft. So should the date of discovery from aircraft Y be moved to aircraft X?vendor cmm 35-xx-xx [oxygen system] system. Ipc fig 1 item -X 80XXXX-xa is a single-pak [oxygen system] unit. But [company 2] has it as a single-pak [oxygen system] unit without generator. But there is one within the carry case! Needs a new [company 2] description and new MEL#ipc fig 1 item -xy 80XXXX-xb is a single-pak [oxygen system] unit. Has no MEL. Ipc fig 1 item -xz 80XXXX-xx is a single-pak [oxygen system] unit. But when you get this part is a O2 generator without the carry case! Ipc fig 1 item -xa 80XXXX-xc is a single-pak [oxygen system] unit has no MEL. Ipc fig 1 item -xb 80XXXX-xd is a single-pak [oxygen system] unit has no MEL. Ipc fig 1 item -xc 80XXXX-xa is a single-pak [oxygen system] unit has no MEL.rework MEL card 35XXX. Spec notes: add to note C . [Oxygen system] single-pak unit(s) not properly serviced are replaced; serviced; or removed at the next available maintenance station where parts are available. Operations placard: each [oxygen system] unit contains one generator pack. Each generator pack supplies 20 minutes of oxygen at 2 lpm for two one users. Question (insert MEL 35065; 35XXX; 35XXZ; 35XXA) if a single pack with one generator supplies 20 minutes at 2 lpm for two users with only one mask. Then; a [oxygen system] duo-pak with two generators should then supply 40 minutes at 2 lpm for two users?

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Original NASA ASRS Text

Title: Maintenance Technician reported confusing documentation in regards to Supplemental Oxygen Units.

Narrative: This [Safety Awareness Program] is going to generate more than ONE problem!Was assigned Aircraft X LP 38XXXXX [Oxygen System] unit robbed for Aircraft Y. After getting possible need part from [Company] went to aircraft and found that the Entire [Oxygen System] unit was missing. Part that was AOG'd (Aircraft On Ground) in for aircraft was 80XXXX-XX. But the part was Oxygen O2 Generator MEL 25-XXXX-X-XXXX = 80XXXX-XX. But needed case also. Since the Deferring station on Aircraft Y removed unit. Per MEL card 35XXX # 35XXY replace or service or remove.NOTE: Affected Unit may remain in place within storage location if unit is placarded.After finding NO IPC (Illustrated Parts Catalog) reference for the Installed [Oxygen System] Single-PAK's went looking in the configuration drawings. 25XXXXXXXX Rev. B. I did find a reference for these units Item XX = 80XXXX-XX = MEL 25-XXXX-X-XXXX = O2 Generator not a complete unit. Then went to the CMM (Component Maintenance Manual) Vendor [Oxygen System] SYSTEMS (need to search for the [Oxygen System] series 80XXXX) then select 35-XX-XX. Near the end section of the CMM is the Vendor IPC. Item XXX = generator which is = 80XXXX-XY = MEL 25-XXXX-X-XXXY. Which is NOT ALLOCATED TO STATIONS. Then item XXY Generator = 80XXXX-XZ = MEL 99-XXXX-X-XXXX which is allocated to stations Then item -X 80XXXX-XA [Oxygen System] Single-Pak. This has a MEL 25-XXXX-X-XXXZ. But has it as NON HAZMAT (Hazardous Materials) and a description of Case; Portable Breathing Unit without Generator. But when you order this MEL you get a Cannot ship from [Company] people due to the generator is shipped with case.Aircraft Y LP 37XXXXX. [Oxygen System] emergency seal broken.[Maintenance] looked at unit found that it was activated (used) so they used MEL 35XXY. they removed unit and placarded storage location. Released aircraft. 8 days later aircraft at ZZZ somebody wants LP cleared. According to the other installed units it needs a 80XXXX-XX unit.But this is only a generator NOT a [Oxygen System] unit. But this part is available in ZZZ1. So they AOG it. After this they go looking for a aircraft that they can rob from. They find Aircraft X they generate a LP 38XXXXX to show that they robbed the Unit for Aircraft Y. Now this is a MEL swap to another Aircraft. So should the date of discovery from Aircraft Y be moved to Aircraft X?Vendor CMM 35-XX-XX [Oxygen System] System. IPC Fig 1 Item -X 80XXXX-XA is a single-pak [Oxygen System] unit. But [Company 2] has it as a single-pak [Oxygen System] unit without generator. But there is one within the carry case! Needs a new [Company 2] description and NEW MEL#IPC Fig 1 item -XY 80XXXX-XB is a single-Pak [Oxygen System] unit. Has NO MEL. IPC Fig 1 item -XZ 80XXXX-XX is a single-Pak [Oxygen System] unit. But when you get this part is a O2 Generator without the carry case! IPC fig 1 item -XA 80XXXX-XC is a single-pak [Oxygen System] unit has No MEL. IPC fig 1 item -XB 80XXXX-XD is a single-pak [Oxygen System] unit has No MEL. IPC fig 1 item -XC 80XXXX-XA is a single-pak [Oxygen System] unit has NO MEL.Rework MEL card 35XXX. Spec Notes: add to Note C . [Oxygen System] Single-Pak unit(s) not properly serviced are replaced; serviced; or removed at the next available maintenance station where parts are available. Operations PLACARD: Each [Oxygen System] unit contains One Generator Pack. Each Generator Pack Supplies 20 Minutes of Oxygen at 2 LPM for TWO ONE users. Question (insert MEL 35065; 35XXX; 35XXZ; 35XXA) If a single pack with ONE generator supplies 20 minutes at 2 LPM for two users with only ONE mask. Then; A [Oxygen System] DUO-PAK with TWO generators should then supply 40 minutes at 2 LPM for two users?

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.