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A B757-200 was dispatched with suspected inadequate cooling to the electronics compartment E4-4 shelf due to missing cooling gaskets. No illustrated parts catalog breakdown for shelf was available.
| Attributes | |
| ACN | 540066 |
| Time | |
| Date | 200202 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| 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 Undifferentiated or Other Model |
| 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 | 540066 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | other personnel other oversight : coordinator |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : equipment cooling warning other other : person 1 |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : engineering procedure contributing factor : manuals performance deficiency : repair |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
Narrative:
Working item 30 -- no sound for stereo channels for entire aircraft and item 32 -- equipment cooling. Safety concern over lack of equipment cooling for critical electronic equipment in main east&east compartment, due to not following chapter 20 standard practices. Maintenance manual 20-10-01-4 paragraph 3C(1) and (3). The audio file server M130 east&east E4-4 tray has a cooling hole approximately 2 inches in diameter drilled into tray with no tray gasket or decal showing where rubber plugs are installed in metering tray, resulting in heavy loss of equipment cooling air pressure. Called technical services X and Y who called engineer Z who says this is normal but has no documentation to support statement.
Original NASA ASRS Text
Title: A B757-200 WAS DISPATCHED WITH SUSPECTED INADEQUATE COOLING TO THE ELECTRONICS COMPARTMENT E4-4 SHELF DUE TO MISSING COOLING GASKETS. NO ILLUSTRATED PARTS CATALOG BREAKDOWN FOR SHELF WAS AVAILABLE.
Narrative: WORKING ITEM 30 -- NO SOUND FOR STEREO CHANNELS FOR ENTIRE ACFT AND ITEM 32 -- EQUIP COOLING. SAFETY CONCERN OVER LACK OF EQUIP COOLING FOR CRITICAL ELECTRONIC EQUIP IN MAIN E&E COMPARTMENT, DUE TO NOT FOLLOWING CHAPTER 20 STANDARD PRACTICES. MAINT MANUAL 20-10-01-4 PARAGRAPH 3C(1) AND (3). THE AUDIO FILE SERVER M130 E&E E4-4 TRAY HAS A COOLING HOLE APPROX 2 INCHES IN DIAMETER DRILLED INTO TRAY WITH NO TRAY GASKET OR DECAL SHOWING WHERE RUBBER PLUGS ARE INSTALLED IN METERING TRAY, RESULTING IN HVY LOSS OF EQUIP COOLING AIR PRESSURE. CALLED TECHNICAL SVCS X AND Y WHO CALLED ENGINEER Z WHO SAYS THIS IS NORMAL BUT HAS NO DOCUMENTATION TO SUPPORT STATEMENT.
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.