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A B727-200 air conditioning flow multiplier was overheated and damaged due to inadvertent disconnect of the overheat switch while being svced.
| Attributes | |
| ACN | 470231 |
| Time | |
| Date | 200004 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | instruction : trainee maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 13 |
| ASRS Report | 470231 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | instruction : instructor |
| Qualification | technician : powerplant technician : airframe |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure |
| Independent Detector | other other : 969 |
| Consequence | other other other |
| Factors | |
| Maintenance | contributing factor : lighting performance deficiency : training performance deficiency : inspection performance deficiency : scheduled maintenance |
| Supplementary | |
| Problem Areas | Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
While performing routine testing of the airflow multiplier protection switch, the electrical power connector may have not been fully installed. On apr/xa/00 I was notified that act xyz airflow multiplier had an overheat condition. Conditions that may have caused this situation are access difficulty to the thermal switch, and poor visibility in the area where maintenance was being performed. To prevent further recurrence of this, I would suggest a secondary inspection is done on the airflow multiplier thermal switch connector and the connector should be checked every time the airflow multiplier oil is checked.
Original NASA ASRS Text
Title: A B727-200 AIR CONDITIONING FLOW MULTIPLIER WAS OVERHEATED AND DAMAGED DUE TO INADVERTENT DISCONNECT OF THE OVERHEAT SWITCH WHILE BEING SVCED.
Narrative: WHILE PERFORMING ROUTINE TESTING OF THE AIRFLOW MULTIPLIER PROTECTION SWITCH, THE ELECTRICAL PWR CONNECTOR MAY HAVE NOT BEEN FULLY INSTALLED. ON APR/XA/00 I WAS NOTIFIED THAT ACT XYZ AIRFLOW MULTIPLIER HAD AN OVERHEAT CONDITION. CONDITIONS THAT MAY HAVE CAUSED THIS SIT ARE ACCESS DIFFICULTY TO THE THERMAL SWITCH, AND POOR VISIBILITY IN THE AREA WHERE MAINT WAS BEING PERFORMED. TO PREVENT FURTHER RECURRENCE OF THIS, I WOULD SUGGEST A SECONDARY INSPECTION IS DONE ON THE AIRFLOW MULTIPLIER THERMAL SWITCH CONNECTOR AND THE CONNECTOR SHOULD BE CHKED EVERY TIME THE AIRFLOW MULTIPLIER OIL IS CHKED.
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.