Narrative:

Air carrier aircraft xyz #1 engine nose cowl was found with damage to inner acoustic liner by FAA inspector at the gate. We removed a serviceable nose cowl from air carrier aircraft abc and installed on aircraft xyz. We made an srm repair per srm (structural repair manual) xx-yy-zz and installed the repaired nose cowl on air carrier aircraft abc. I signed the work card as repaired nose cowl per B737 srm xx-yy-zz. The problem is that in the srm section, it was difficult to determine if the limits of repair were only 6 square inches or 75 square inches. There was no structural damage done to the acoustic panel -- only the acoustic screen mesh on top of the honeycomb panel was delaminated. I repaired (reattached) the screen in several places using 'resin mix B' per the srm section -- using 75 square inches as the limit of repair. I'm not sure which limits apply here and believe some clarification in the srm would prevent problems in the future.

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Original NASA ASRS Text

Title: A B737-200 HAD THE #1 ENG INLET COWLING INNER ACOUSTICAL LINER REPAIRED PER THE STRUCTURAL REPAIR MANUAL BUT SOME CONFLICT EXISTS IN THE MANUAL ON THE REPAIR LIMITS FOR IDENTICAL REPAIRS.

Narrative: ACR ACFT XYZ #1 ENG NOSE COWL WAS FOUND WITH DAMAGE TO INNER ACOUSTIC LINER BY FAA INSPECTOR AT THE GATE. WE REMOVED A SERVICEABLE NOSE COWL FROM ACR ACFT ABC AND INSTALLED ON ACFT XYZ. WE MADE AN SRM REPAIR PER SRM (STRUCTURAL REPAIR MANUAL) XX-YY-ZZ AND INSTALLED THE REPAIRED NOSE COWL ON ACR ACFT ABC. I SIGNED THE WORK CARD AS REPAIRED NOSE COWL PER B737 SRM XX-YY-ZZ. THE PROB IS THAT IN THE SRM SECTION, IT WAS DIFFICULT TO DETERMINE IF THE LIMITS OF REPAIR WERE ONLY 6 SQUARE INCHES OR 75 SQUARE INCHES. THERE WAS NO STRUCTURAL DAMAGE DONE TO THE ACOUSTIC PANEL -- ONLY THE ACOUSTIC SCREEN MESH ON TOP OF THE HONEYCOMB PANEL WAS DELAMINATED. I REPAIRED (REATTACHED) THE SCREEN IN SEVERAL PLACES USING 'RESIN MIX B' PER THE SRM SECTION -- USING 75 SQUARE INCHES AS THE LIMIT OF REPAIR. I'M NOT SURE WHICH LIMITS APPLY HERE AND BELIEVE SOME CLARIFICATION IN THE SRM WOULD PREVENT PROBS IN THE FUTURE.

Data retrieved from NASA's ASRS site as of July 2007 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.