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A B737-300 incurred a delay caused by the assigned technician being unable to locate the correct hydraulic reservoir pressure limits.
| Attributes | |
| ACN | 483739 |
| Time | |
| Date | 200009 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Dusk |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 21 |
| ASRS Report | 483739 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | oversight : supervisor |
| Qualification | technician : powerplant technician : airframe |
| Events | |
| Anomaly | maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other other : person 2 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure contributing factor : manuals performance deficiency : fault isolation performance deficiency : training performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Company Chart Or Publication Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
The MEL covers a reservoir pressure being deferrable. Nothing even maintenance manuals don't cover this system under normal operation. It does mention that if doing adjustment and test you have leakage and which would be allow indication you can defer it if pressure stays normal with engines running. Nothing covers what is accepted low and high pressures.
Original NASA ASRS Text
Title: A B737-300 INCURRED A DELAY CAUSED BY THE ASSIGNED TECHNICIAN BEING UNABLE TO LOCATE THE CORRECT HYD RESERVOIR PRESSURE LIMITS.
Narrative: THE MEL COVERS A RESERVOIR PRESSURE BEING DEFERRABLE. NOTHING EVEN MAINT MANUALS DON'T COVER THIS SYS UNDER NORMAL OP. IT DOES MENTION THAT IF DOING ADJUSTMENT AND TEST YOU HAVE LEAKAGE AND WHICH WOULD BE ALLOW INDICATION YOU CAN DEFER IT IF PRESSURE STAYS NORMAL WITH ENGS RUNNING. NOTHING COVERS WHAT IS ACCEPTED LOW AND HIGH PRESSURES.
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.