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A B737 aircraft experienced an overspeed condition at altitude. Required inspection not accomplished due to confusion on barometric reading.
| Attributes | |
| ACN | 737120 |
| Time | |
| Date | 200704 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Controlling Facilities | tower : lga.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance technician : 5 |
| ASRS Report | 737120 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure contributing factor : manuals performance deficiency : non compliance with legal requirements performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance Maintenance Human Performance Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
Narrative:
Aircraft experienced an overspd condition at altitude according to the flight crew. At that time the crew reported the aircraft did not meet or exceed the 0.02 mmo due to altitude baro reading when the overspd occurred. Using the information given to me at the time I determined that no inspection was required per reference maintenance manual 05-51-00-0. There seems to be confusion as to the mmo or vmo limits factoring in baro pressure reading. To avoid future problems a solution may be an 'airspeed exceedance report.' this form will be filled out by the flight crew. Factors such as the mmo/vmo/airspeed/baro reading/flap position and turbulence; etc; should be documented. I feel such a form will help avoid other mechanic's from making the same mistakes in the future.
Original NASA ASRS Text
Title: A B737 ACFT EXPERIENCED AN OVERSPEED CONDITION AT ALTITUDE. REQUIRED INSPECTION NOT ACCOMPLISHED DUE TO CONFUSION ON BAROMETRIC READING.
Narrative: ACFT EXPERIENCED AN OVERSPD CONDITION AT ALT ACCORDING TO THE FLT CREW. AT THAT TIME THE CREW RPTED THE ACFT DID NOT MEET OR EXCEED THE 0.02 MMO DUE TO ALT BARO READING WHEN THE OVERSPD OCCURRED. USING THE INFO GIVEN TO ME AT THE TIME I DETERMINED THAT NO INSPECTION WAS REQUIRED PER REF MAINT MANUAL 05-51-00-0. THERE SEEMS TO BE CONFUSION AS TO THE MMO OR VMO LIMITS FACTORING IN BARO PRESSURE READING. TO AVOID FUTURE PROBS A SOLUTION MAY BE AN 'AIRSPD EXCEEDANCE RPT.' THIS FORM WILL BE FILLED OUT BY THE FLT CREW. FACTORS SUCH AS THE MMO/VMO/AIRSPD/BARO READING/FLAP POS AND TURB; ETC; SHOULD BE DOCUMENTED. I FEEL SUCH A FORM WILL HELP AVOID OTHER MECH'S FROM MAKING THE SAME MISTAKES IN THE FUTURE.
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.