Narrative:

ZZZ maintenance found a 1.5 inch crack on the R-1 door threshold. They referenced engineering repair order (ero) 53-xx as the document to place the threshold crack on a deferral requiring repetitive inspections. When I reviewed the document before issuing the deferral; I missed that the ero was not effective for a 737-900ER. Sometime after the deferral was issued; someone from ZZZ maintenance entered into the maintenance computer program a revised ero with a 'check each flight' inspection requirement but failed to notify anyone in maintenance control of the change.

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Original NASA ASRS Text

Title: A Maintenance Controller reports he missed a 'note' on an Engineering Repair Order (ERO) for an R-1 door threshold crack deferral that stated the ERO was 'not effective' for B737-900ER aircraft. Adding to the confusion; a later entry by Maintenance had revised the ERO without informing Maintenance Control.

Narrative: ZZZ Maintenance found a 1.5 inch crack on the R-1 door threshold. They referenced Engineering Repair Order (ERO) 53-XX as the document to place the threshold crack on a deferral requiring Repetitive Inspections. When I reviewed the document before issuing the Deferral; I missed that the ERO was not effective for a 737-900ER. Sometime after the Deferral was issued; someone from ZZZ Maintenance entered into the Maintenance Computer program a revised ERO with a 'check each flight' inspection requirement but failed to notify anyone in Maintenance Control of the change.

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.