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A dehavilland dash 8 was found to have a defective cockpit temperature rheostat and was replaced with a supposedly interchangeable rheostat which proved to be not interchangeable.
| Attributes | |
| ACN | 496486 |
| Time | |
| Date | 200011 |
| Day | Mon |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8-100 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 1 |
| ASRS Report | 496486 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | oversight : supervisor |
| Qualification | technician : powerplant technician : fcc technician : airframe |
| Events | |
| Anomaly | aircraft equipment problem : less severe maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure |
| Independent Detector | other other : 969 |
| Consequence | other other |
| Factors | |
| Maintenance | performance deficiency : fault isolation performance deficiency : repair performance deficiency : logbook entry performance deficiency : installation |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Maintenance Human Performance |
| Primary Problem | Chart Or Publication |
| Situations | |
| Publication | ILLUSTRATED PARTS CATALOG |
Narrative:
On nov/xa/00, aircraft xyz came in for maintenance. There was a logbook write-up with air conditioning system. The write-up was unable to get warm air into the flight compartment without overheating passenger. Upon troubleshooting, found cabin temperature sensor inoperative, of which I replaced. Also, I replaced a cockpit temperature sensor and temperature trim valve. Found that the flight compartment rheostat was inoperative. I went to the avionics department to get an air conditioning panel, but none were in stock. So avionics department gave me a part number for the rheostat. I went to install the rheostat and noticed it didn't look the same. The avionics department assured me that it was the right part, it's an interchangeable rheostat. So I installed it, and still no fix with the discrepancy. I xferred back to the logbook for a continued MEL. Then on dec/xc/00, at another maintenance base, another mechanic found that the rheostat was the wrong part. So they replaced the air conditioning panel -- operations checked good.
Original NASA ASRS Text
Title: A DEHAVILLAND DASH 8 WAS FOUND TO HAVE A DEFECTIVE COCKPIT TEMP RHEOSTAT AND WAS REPLACED WITH A SUPPOSEDLY INTERCHANGEABLE RHEOSTAT WHICH PROVED TO BE NOT INTERCHANGEABLE.
Narrative: ON NOV/XA/00, ACFT XYZ CAME IN FOR MAINT. THERE WAS A LOGBOOK WRITE-UP WITH AIR CONDITIONING SYS. THE WRITE-UP WAS UNABLE TO GET WARM AIR INTO THE FLT COMPARTMENT WITHOUT OVERHEATING PAX. UPON TROUBLESHOOTING, FOUND CABIN TEMP SENSOR INOP, OF WHICH I REPLACED. ALSO, I REPLACED A COCKPIT TEMP SENSOR AND TEMP TRIM VALVE. FOUND THAT THE FLT COMPARTMENT RHEOSTAT WAS INOP. I WENT TO THE AVIONICS DEPT TO GET AN AIR CONDITIONING PANEL, BUT NONE WERE IN STOCK. SO AVIONICS DEPT GAVE ME A PART NUMBER FOR THE RHEOSTAT. I WENT TO INSTALL THE RHEOSTAT AND NOTICED IT DIDN'T LOOK THE SAME. THE AVIONICS DEPT ASSURED ME THAT IT WAS THE RIGHT PART, IT'S AN INTERCHANGEABLE RHEOSTAT. SO I INSTALLED IT, AND STILL NO FIX WITH THE DISCREPANCY. I XFERRED BACK TO THE LOGBOOK FOR A CONTINUED MEL. THEN ON DEC/XC/00, AT ANOTHER MAINT BASE, ANOTHER MECH FOUND THAT THE RHEOSTAT WAS THE WRONG PART. SO THEY REPLACED THE AIR CONDITIONING PANEL -- OPS CHKED GOOD.
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.