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Air carrier mechanic submits report on why he felt justified in releasing medium large transport to service with angle of attack vane slightly bent outward.
| Attributes | |
| ACN | 204458 |
| Time | |
| Date | 199203 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | ground : preflight |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| ASRS Report | 204458 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other other : unspecified |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : investigated |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
While on the gate, a logbook entry, PIREP, was entered concerning the left stall vane (angle of attack transducer). The complaint was that the vane was gent (see attached). As the mechanic who approved the condition for further service I based my reasoning on several factors. 1) in the maintenance manual no limits concerning bending is mentioned. 2) reviewing the recent history (31 days) no PIREPS concerning stall warning were entered in the logbook. 3) a copy of a letter sent to the local aircraft manufacturer's office concerning bend conditions of angle of attack vanes. 4) my personal inspection that the vane was not bent up or down. The vane was not twisted or deformed. The vent was bent slightly away from the fuselage more than the right vane. The vane moved freely with no binding. I have attached all pertinent correspondence concerning the bent vane problem. Also there was a maintenance advisory issued in 1990.
Original NASA ASRS Text
Title: ACR MECH SUBMITS RPT ON WHY HE FELT JUSTIFIED IN RELEASING MLG TO SVC WITH ANGLE OF ATTACK VANE SLIGHTLY BENT OUTWARD.
Narrative: WHILE ON THE GATE, A LOGBOOK ENTRY, PIREP, WAS ENTERED CONCERNING THE L STALL VANE (ANGLE OF ATTACK TRANSDUCER). THE COMPLAINT WAS THAT THE VANE WAS GENT (SEE ATTACHED). AS THE MECH WHO APPROVED THE CONDITION FOR FURTHER SVC I BASED MY REASONING ON SEVERAL FACTORS. 1) IN THE MAINT MANUAL NO LIMITS CONCERNING BENDING IS MENTIONED. 2) REVIEWING THE RECENT HISTORY (31 DAYS) NO PIREPS CONCERNING STALL WARNING WERE ENTERED IN THE LOGBOOK. 3) A COPY OF A LETTER SENT TO THE LCL ACFT MANUFACTURER'S OFFICE CONCERNING BEND CONDITIONS OF ANGLE OF ATTACK VANES. 4) MY PERSONAL INSPECTION THAT THE VANE WAS NOT BENT UP OR DOWN. THE VANE WAS NOT TWISTED OR DEFORMED. THE VENT WAS BENT SLIGHTLY AWAY FROM THE FUSELAGE MORE THAN THE R VANE. THE VANE MOVED FREELY WITH NO BINDING. I HAVE ATTACHED ALL PERTINENT CORRESPONDENCE CONCERNING THE BENT VANE PROBLEM. ALSO THERE WAS A MAINT ADVISORY ISSUED IN 1990.
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.