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An EMB140 returned to the departure airport due to unable to pressurize. Found vacuum hose not connected to digital pressurization controller.
| Attributes | |
| ACN | 710871 |
| Time | |
| Date | 200609 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Controlling Facilities | tower : pub.tower |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 135 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 710871 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : cabin press indication other flight crewa other flight crewb |
| Resolutory Action | flight crew : diverted to another airport |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : non compliance with legal requirements performance deficiency : testing performance deficiency : logbook entry performance deficiency : installation performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Environmental Factor Maintenance Human Performance Aircraft Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
Narrative:
I removed and replaced the digital controller for a MEL to correct an automatic mode problem for the pressurization system. I connected the epov (electro pneumatic outflow valve) vacuum line tube; and ensured no safety wire was still installed to the epov for the existing MEL. The cannon plug was secured also before I had the pressurization adjustment/test performed. The pressurization worked in automatic and manual mode as I stated in the maintenance logbook. Therefore; I was very surprised to come back to work and hear about this incident. But I know that I connected this vacuum line tube to run my pressurization test.
Original NASA ASRS Text
Title: AN EMB140 RETURNED TO THE DEP ARPT DUE TO UNABLE TO PRESSURIZE. FOUND VACUUM HOSE NOT CONNECTED TO DIGITAL PRESSURIZATION CTLR.
Narrative: I REMOVED AND REPLACED THE DIGITAL CTLR FOR A MEL TO CORRECT AN AUTO MODE PROB FOR THE PRESSURIZATION SYS. I CONNECTED THE EPOV (ELECTRO PNEUMATIC OUTFLOW VALVE) VACUUM LINE TUBE; AND ENSURED NO SAFETY WIRE WAS STILL INSTALLED TO THE EPOV FOR THE EXISTING MEL. THE CANNON PLUG WAS SECURED ALSO BEFORE I HAD THE PRESSURIZATION ADJUSTMENT/TEST PERFORMED. THE PRESSURIZATION WORKED IN AUTO AND MANUAL MODE AS I STATED IN THE MAINT LOGBOOK. THEREFORE; I WAS VERY SURPRISED TO COME BACK TO WORK AND HEAR ABOUT THIS INCIDENT. BUT I KNOW THAT I CONNECTED THIS VACUUM LINE TUBE TO RUN MY PRESSURIZATION TEST.
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.