Narrative:

In mar 2007 aircraft's #1 engine required replacement. During the installation of the #1 engine; in accordance with maintenance job card item; the front side mounts were inadvertently installed incorrectly; with the beveled sandwich pad and the plain sandwich pad reversed. Upon engine completion; aircraft was released for revenue service. 8 days later aircraft was written up for propeller vibration. Upon investigation the top forward mount was found to be defective. At that time the forward side mounts were found to be installed incorrectly. Maintenance job card item step (2)(a) should state that the beveled pad be installed on the aft side of the brackets and that the plain pad be installed on the forward side of the brackets. At the time of engine replacement numerous new employees unfamiliar with the procedure were assisting. Also; the maintenance job card instructions for installation of forward side mounts interpretation can be deceiving.

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Original NASA ASRS Text

Title: A DE-HAVILLAND DASH 8-200 ACFT WAS FOUND TO HAVE THE #1 ENG INBOARD AND OUTBOARD SIDE MOUNTS INSTALLED INCORRECTLY. ENG WRITTEN-UP FOR PROP VIBRATION.

Narrative: IN MAR 2007 ACFT'S #1 ENG REQUIRED REPLACEMENT. DURING THE INSTALLATION OF THE #1 ENG; IN ACCORDANCE WITH MAINT JOB CARD ITEM; THE FRONT SIDE MOUNTS WERE INADVERTENTLY INSTALLED INCORRECTLY; WITH THE BEVELED SANDWICH PAD AND THE PLAIN SANDWICH PAD REVERSED. UPON ENG COMPLETION; ACFT WAS RELEASED FOR REVENUE SVC. 8 DAYS LATER ACFT WAS WRITTEN UP FOR PROP VIBRATION. UPON INVESTIGATION THE TOP FORWARD MOUNT WAS FOUND TO BE DEFECTIVE. AT THAT TIME THE FORWARD SIDE MOUNTS WERE FOUND TO BE INSTALLED INCORRECTLY. MAINT JOB CARD ITEM STEP (2)(A) SHOULD STATE THAT THE BEVELED PAD BE INSTALLED ON THE AFT SIDE OF THE BRACKETS AND THAT THE PLAIN PAD BE INSTALLED ON THE FORWARD SIDE OF THE BRACKETS. AT THE TIME OF ENG REPLACEMENT NUMEROUS NEW EMPLOYEES UNFAMILIAR WITH THE PROC WERE ASSISTING. ALSO; THE MAINT JOB CARD INSTRUCTIONS FOR INSTALLATION OF FORWARD SIDE MOUNTS INTERP CAN BE DECEIVING.

Data retrieved from NASA's ASRS site as of January 2009 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.