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A B737-300 captain reports of suspected improper maintenance procedures on his carrier's B737's. Two aircraft CSD's oil temperature written up and deferred without maintenance verifying CSD oil quantity or oil cooler condition.
| Attributes | |
| ACN | 752769 |
| Time | |
| Date | 200709 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 120 flight time total : 10500 flight time type : 3000 |
| ASRS Report | 752769 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Events | |
| Anomaly | maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : fault isolation performance deficiency : non compliance with legal requirements performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Company |
| Primary Problem | Maintenance Human Performance |
| Situations | |
| Publication | MEL Procs |
Narrative:
The report is being written to document suspected improper maintenance procedures on our B737 aircraft. 2 recent aircraft had the CSD 'in' temperature written up as being more than 10 hotter than the other CSD 'in' temperature. This is an actual maintenance discrepancy with its own maintenance code. In both instances; maintenance deferred the 'in' function of the temperature gauge. Maintenance did not check or verify the CSD oil level to see if it had enough oil. Neither did they do any visual inspection of the CSD oil cooler whatsoever. In both cases; it was assumed as a bad temperature sensor without any troubleshooting whatsoever. I will not go into what motivations may have been behind these actions; but simply; I believe that these deferrals without first verifying the health of the CSD by checking the oil level and oil cooler is improper. I would appreciate a further investigation to see if this is the proper troubleshooting procedure for this type of maintenance irregularity.
Original NASA ASRS Text
Title: A B737-300 CAPTAIN REPORTS OF SUSPECTED IMPROPER MAINT PROCEDURES ON HIS CARRIER'S B737'S. TWO ACFT CSD'S OIL TEMP WRITTEN UP AND DEFERRED WITHOUT MAINT VERIFYING CSD OIL QUANTITY OR OIL COOLER CONDITION.
Narrative: THE RPT IS BEING WRITTEN TO DOCUMENT SUSPECTED IMPROPER MAINT PROCS ON OUR B737 ACFT. 2 RECENT ACFT HAD THE CSD 'IN' TEMP WRITTEN UP AS BEING MORE THAN 10 HOTTER THAN THE OTHER CSD 'IN' TEMP. THIS IS AN ACTUAL MAINT DISCREPANCY WITH ITS OWN MAINT CODE. IN BOTH INSTANCES; MAINT DEFERRED THE 'IN' FUNCTION OF THE TEMP GAUGE. MAINT DID NOT CHK OR VERIFY THE CSD OIL LEVEL TO SEE IF IT HAD ENOUGH OIL. NEITHER DID THEY DO ANY VISUAL INSPECTION OF THE CSD OIL COOLER WHATSOEVER. IN BOTH CASES; IT WAS ASSUMED AS A BAD TEMP SENSOR WITHOUT ANY TROUBLESHOOTING WHATSOEVER. I WILL NOT GO INTO WHAT MOTIVATIONS MAY HAVE BEEN BEHIND THESE ACTIONS; BUT SIMPLY; I BELIEVE THAT THESE DEFERRALS WITHOUT FIRST VERIFYING THE HEALTH OF THE CSD BY CHKING THE OIL LEVEL AND OIL COOLER IS IMPROPER. I WOULD APPRECIATE A FURTHER INVESTIGATION TO SEE IF THIS IS THE PROPER TROUBLESHOOTING PROC FOR THIS TYPE OF MAINT IRREGULARITY.
Data retrieved from NASA's ASRS site as of January 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.