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A B737-300 was released for service with the #2 air data computer static and pitot pressure lines not reconnected after an inertial reference unit replacement.
| Attributes | |
| ACN | 411160 |
| Time | |
| Date | 199808 |
| Day | Sun |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz |
| State Reference | US |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| ASRS Report | 411160 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : far non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
On aug/xa/98 during the repair and replacement of the #1 inertial reference unit, the pitot and static lines were disconnected from the #2 air data computer (rod) to ease the removal of the inertial reference unit due to lines interfere, as not to damage line. Completed the installation, operations checked as per job card, and checked good. On a later date, I was informed that the crew reported a problem. Was later found that the pitot or static line were found to be loose. Since we have recently experienced this same problem, we have discussed with management and fellow employees on how to avoid this same problem. We are discussing several options, one being getting with engineering on the possibility of repositioning the pitot static lines for that particular air data computer, so as not to have to remove the line to be able to remove the #1 inertial reference unit. Other options are removing the air data computer completely out of rack, when performing that job.
Original NASA ASRS Text
Title: A B737-300 WAS RELEASED FOR SVC WITH THE #2 AIR DATA COMPUTER STATIC AND PITOT PRESSURE LINES NOT RECONNECTED AFTER AN INERTIAL REF UNIT REPLACEMENT.
Narrative: ON AUG/XA/98 DURING THE REPAIR AND REPLACEMENT OF THE #1 INERTIAL REF UNIT, THE PITOT AND STATIC LINES WERE DISCONNECTED FROM THE #2 AIR DATA COMPUTER (ROD) TO EASE THE REMOVAL OF THE INERTIAL REF UNIT DUE TO LINES INTERFERE, AS NOT TO DAMAGE LINE. COMPLETED THE INSTALLATION, OPS CHKED AS PER JOB CARD, AND CHKED GOOD. ON A LATER DATE, I WAS INFORMED THAT THE CREW RPTED A PROB. WAS LATER FOUND THAT THE PITOT OR STATIC LINE WERE FOUND TO BE LOOSE. SINCE WE HAVE RECENTLY EXPERIENCED THIS SAME PROB, WE HAVE DISCUSSED WITH MGMNT AND FELLOW EMPLOYEES ON HOW TO AVOID THIS SAME PROB. WE ARE DISCUSSING SEVERAL OPTIONS, ONE BEING GETTING WITH ENGINEERING ON THE POSSIBILITY OF REPOSITIONING THE PITOT STATIC LINES FOR THAT PARTICULAR AIR DATA COMPUTER, SO AS NOT TO HAVE TO REMOVE THE LINE TO BE ABLE TO REMOVE THE #1 INERTIAL REF UNIT. OTHER OPTIONS ARE REMOVING THE AIR DATA COMPUTER COMPLETELY OUT OF RACK, WHEN PERFORMING THAT JOB.
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.