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A B737-800 was dispatched with incorrect entries on the rudder PCU leakage test job card. Caused mainly by job card conflicting information.
| Attributes | |
| ACN | 718628 |
| Time | |
| Date | 200611 |
| 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 | B737-800 |
| Operating Under FAR Part | Part 121 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance lead technician : 7 maintenance technician : 24 |
| ASRS Report | 718628 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | other other : 3 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : work cards performance deficiency : non compliance with legal requirements performance deficiency : testing performance deficiency : scheduled maintenance performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Environmental Factor Chart Or Publication Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
During a rudder PCU leakage test; an entry was made on a work card as 1.2 (amps)when it should have been the difference between 2 readings. The technician that was taking the readings inadvertently entered that figure on the wrong block. This took place on a very busy night with a large workload and some unscheduled maintenance that had us spread quite thin. The work card is quite detailed and requires strong attention to each letter in the text. I was under the influence of a bad cold at the time and was having a difficult time. I mistakenly signed for the technician that took the readings without verifying personally that the readings were taken correctly and that the system passed the test. Also; the readings for the 'a' system test were taken with the ammeter set to 'dc' as was called out for in the section for the 'B' system but there is a note in the text that states the meter must be set to 'AC' for the 'a' system.
Original NASA ASRS Text
Title: A B737-800 WAS DISPATCHED WITH INCORRECT ENTRIES ON THE RUDDER PCU LEAKAGE TEST JOB CARD. CAUSED MAINLY BY JOB CARD CONFLICTING INFO.
Narrative: DURING A RUDDER PCU LEAKAGE TEST; AN ENTRY WAS MADE ON A WORK CARD AS 1.2 (AMPS)WHEN IT SHOULD HAVE BEEN THE DIFFERENCE BTWN 2 READINGS. THE TECHNICIAN THAT WAS TAKING THE READINGS INADVERTENTLY ENTERED THAT FIGURE ON THE WRONG BLOCK. THIS TOOK PLACE ON A VERY BUSY NIGHT WITH A LARGE WORKLOAD AND SOME UNSCHEDULED MAINT THAT HAD US SPREAD QUITE THIN. THE WORK CARD IS QUITE DETAILED AND REQUIRES STRONG ATTN TO EACH LETTER IN THE TEXT. I WAS UNDER THE INFLUENCE OF A BAD COLD AT THE TIME AND WAS HAVING A DIFFICULT TIME. I MISTAKENLY SIGNED FOR THE TECHNICIAN THAT TOOK THE READINGS WITHOUT VERIFYING PERSONALLY THAT THE READINGS WERE TAKEN CORRECTLY AND THAT THE SYS PASSED THE TEST. ALSO; THE READINGS FOR THE 'A' SYS TEST WERE TAKEN WITH THE AMMETER SET TO 'DC' AS WAS CALLED OUT FOR IN THE SECTION FOR THE 'B' SYS BUT THERE IS A NOTE IN THE TEXT THAT STATES THE METER MUST BE SET TO 'AC' FOR THE 'A' SYS.
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.