B737-900
Maintenance Airframe; Maintenance Powerplant
Situational Awareness; Communication Breakdown; Confusion
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
MEL; Human Factors; Aircraft
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.
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.