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Mechanic replacing a recirc fan for excessive loud cockpit noise on a deferred write-up for a B757-200; realizes a new fan was already installed; but did not have the required restrictor plate to muffle the fan noise.
| Attributes | |
| ACN | 779926 |
| Time | |
| Date | 200803 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 779926 |
| Events | |
| Anomaly | maintenance problem : improper documentation |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : engineering procedure contributing factor : briefing performance deficiency : repair performance deficiency : installation performance deficiency : scheduled maintenance |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Company Maintenance Human Performance |
| Primary Problem | Chart Or Publication |
Narrative:
Pilot write-up; subsequently deferred: 'in-flight recirculation fan in flight deck too loud; difficult to communication in-flight making it unsafe.' amt checked parts for replacement fan. Amt checked maintenance tip for company accomplishment. Engineering order accomplished after gaining access to recirculation fan; amt found new fan was installed per the engineering order but the new fan did not have the restrictor plate installed; which is the point of the engineering order. This restrictor plate muffles the noise of the new fan. Amt ordered new fan; which had the restrictor plate installed.
Original NASA ASRS Text
Title: MECHANIC REPLACING A RECIRC FAN FOR EXCESSIVE LOUD COCKPIT NOISE ON A DEFERRED WRITE-UP FOR A B757-200; REALIZES A NEW FAN WAS ALREADY INSTALLED; BUT DID NOT HAVE THE REQUIRED RESTRICTOR PLATE TO MUFFLE THE FAN NOISE.
Narrative: PLT WRITE-UP; SUBSEQUENTLY DEFERRED: 'INFLT RECIRCULATION FAN IN FLT DECK TOO LOUD; DIFFICULT TO COM INFLT MAKING IT UNSAFE.' AMT CHKED PARTS FOR REPLACEMENT FAN. AMT CHKED MAINT TIP FOR COMPANY ACCOMPLISHMENT. ENGINEERING ORDER ACCOMPLISHED AFTER GAINING ACCESS TO RECIRCULATION FAN; AMT FOUND NEW FAN WAS INSTALLED PER THE ENGINEERING ORDER BUT THE NEW FAN DID NOT HAVE THE RESTRICTOR PLATE INSTALLED; WHICH IS THE POINT OF THE ENGINEERING ORDER. THIS RESTRICTOR PLATE MUFFLES THE NOISE OF THE NEW FAN. AMT ORDERED NEW FAN; WHICH HAD THE RESTRICTOR PLATE INSTALLED.
Data retrieved from NASA's ASRS site as of May 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.