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Publication deficiency. This mechanic reports that his air carrier's B-727-200 maintenance manual's section on the 'B' system electrically driven hydraulic pump high pressure adjustments is misleading and poorly organized.
| Attributes | |
| ACN | 307565 |
| Time | |
| Date | 199506 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : iah |
| State Reference | TX |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| ASRS Report | 307565 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | oversight : supervisor |
| Qualification | other other : other |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other other : unspecified |
| Resolutory Action | none taken : detected after the fact other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Chart Or Publication |
| Air Traffic Incident | other |
| Situations | |
| Publication | Unspecified |
Narrative:
On jun/mon/95, an air carrier B-727-200 transited iah. I adjusted both hydraulic pumps from 3150 and 3400 psi to 3000 psi by maintenance manual reference 'B' system pumps 29-12-11 page 204 paragraph 6C. I signed logbook off, but did not use a maintenance manual reference. I later discovered in the boeing maintenance manual under the trouble-shooting guide that states to change pumps if pressure is above 3100 psi, even though that maintenance manual gives us permission to adjust pressure with no limits as to high pressure before a pump can be adjusted.
Original NASA ASRS Text
Title: PUB DEFICIENCY. THIS MECH RPTS THAT HIS ACR'S B-727-200 MAINT MANUAL'S SECTION ON THE 'B' SYS ELECTRICALLY DRIVEN HYD PUMP HIGH PRESSURE ADJUSTMENTS IS MISLEADING AND POORLY ORGANIZED.
Narrative: ON JUN/MON/95, AN ACR B-727-200 TRANSITED IAH. I ADJUSTED BOTH HYD PUMPS FROM 3150 AND 3400 PSI TO 3000 PSI BY MAINT MANUAL REF 'B' SYS PUMPS 29-12-11 PAGE 204 PARAGRAPH 6C. I SIGNED LOGBOOK OFF, BUT DID NOT USE A MAINT MANUAL REF. I LATER DISCOVERED IN THE BOEING MAINT MANUAL UNDER THE TROUBLE-SHOOTING GUIDE THAT STATES TO CHANGE PUMPS IF PRESSURE IS ABOVE 3100 PSI, EVEN THOUGH THAT MAINT MANUAL GIVES US PERMISSION TO ADJUST PRESSURE WITH NO LIMITS AS TO HIGH PRESSURE BEFORE A PUMP CAN BE ADJUSTED.
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.