 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A line aircraft maintenance technician (amt) was informed that a flight crew noticed a pressure drop and low oxygen flow during an oxygen (O2) mask preflight check on a B737-900 aircraft. Technician noted the crew O2 pressure did not require servicing during his overnight service check. The carbon fiber composite crew O2 bottle valve handle was found not fully opened.
| Attributes | |
| ACN | 1114051 |
| Time | |
| Date | 201308 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737-900 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
Accomplished required checks on overnight number 2 service check of a B737-900 crew oxygen (O2) system. Flow check was accomplished as per air carrier number 2 service work card; step-14c and [flow] check passed. Aircraft was moved to gate and flight crew reported no O2 flow to mask. Line maintenance checked [02] system and found O2 bottle full; but not fully opened. Bottle was fully opened and returned flow to crew mask with no delay incurred. Safety concern. Maintenance alerts were reviewed and further on-the job training (OJT) would enhance maintenance.
Original NASA ASRS Text
Title: A Line Aircraft Maintenance Technician (AMT) was informed that a flight crew noticed a pressure drop and low oxygen flow during an Oxygen (O2) Mask preflight check on a B737-900 aircraft. Technician noted the Crew O2 pressure did not require servicing during his Overnight Service Check. The carbon fiber composite crew O2 bottle valve handle was found not fully opened.
Narrative: Accomplished required checks on Overnight Number 2 Service Check of a B737-900 Crew Oxygen (O2) System. Flow Check was accomplished as per Air Carrier Number 2 Service Work Card; Step-14c and [Flow] Check passed. Aircraft was moved to gate and flight crew reported no O2 flow to mask. Line Maintenance checked [02] system and found O2 bottle full; but not fully opened. Bottle was fully opened and returned flow to crew mask with no delay incurred. Safety concern. Maintenance Alerts were reviewed and further On-the Job Training (OJT) would enhance Maintenance.
Data retrieved from NASA's ASRS site as of July 2013 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.