 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
An AS350 with chronic high main rotor speed had the fuel control governor rigged several times. None of the maintenance accomplished was entered in logbook.
| Attributes | |
| ACN | 726392 |
| Time | |
| Date | 200702 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air taxi |
| Make Model Name | AS 350 Astar/Ecureuil |
| Operating Under FAR Part | Part 135 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | other |
| Function | maintenance : technician |
| Experience | maintenance lead technician : 16 maintenance technician : 15 |
| ASRS Report | 726392 |
| Person 2 | |
| Affiliation | other |
| Function | maintenance : lead technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : fuel control governor other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : non compliance with legal requirements performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Chart Or Publication Environmental Factor |
| Primary Problem | Maintenance Human Performance |
Narrative:
Post maintenance flight after replacing engine 100 hour airframe inspection replacing bilateral support under transmission. Director of operations was notified as per operations manual for request for flight check. Permission was granted. Problem: nr (main rotor speed) was found to be high on the ground. A rigging move was made; and flight check was continued to the hover phase. Found nr was high (just) moved to forward flight under ATC control approach. At 3088 ft; rechked main rotor speed; found it to be too high although all other parameters were ok. Re-rigged fuel control 3 times with no result. Called it a day after 16 1/2 hours. On feb/mon; re-rigged aircraft from scratch located problem repaired it and re-flew; nr was now within 'ft' manual limits. Pilot then told us that the nr was always high; and company base lead told then just to flight it. Aircraft was check-flown before a logbook entry or release to service was completed. As of this date maintenance entry has [not] yet been completed.
Original NASA ASRS Text
Title: AN AS350 WITH CHRONIC HIGH MAIN ROTOR SPD HAD THE FUEL CTL GOVERNOR RIGGED SEVERAL TIMES. NONE OF THE MAINT ACCOMPLISHED WAS ENTERED IN LOGBOOK.
Narrative: POST MAINT FLT AFTER REPLACING ENG 100 HR AIRFRAME INSPECTION REPLACING BILATERAL SUPPORT UNDER XMISSION. DIRECTOR OF OPS WAS NOTIFIED AS PER OPS MANUAL FOR REQUEST FOR FLT CHK. PERMISSION WAS GRANTED. PROB: NR (MAIN ROTOR SPD) WAS FOUND TO BE HIGH ON THE GND. A RIGGING MOVE WAS MADE; AND FLT CHK WAS CONTINUED TO THE HOVER PHASE. FOUND NR WAS HIGH (JUST) MOVED TO FORWARD FLT UNDER ATC CTL APCH. AT 3088 FT; RECHKED MAIN ROTOR SPD; FOUND IT TO BE TOO HIGH ALTHOUGH ALL OTHER PARAMETERS WERE OK. RE-RIGGED FUEL CTL 3 TIMES WITH NO RESULT. CALLED IT A DAY AFTER 16 1/2 HRS. ON FEB/MON; RE-RIGGED ACFT FROM SCRATCH LOCATED PROB REPAIRED IT AND RE-FLEW; NR WAS NOW WITHIN 'FT' MANUAL LIMITS. PLT THEN TOLD US THAT THE NR WAS ALWAYS HIGH; AND COMPANY BASE LEAD TOLD THEN JUST TO FLT IT. ACFT WAS CHK-FLOWN BEFORE A LOGBOOK ENTRY OR RELEASE TO SVC WAS COMPLETED. AS OF THIS DATE MAINT ENTRY HAS [NOT] YET BEEN COMPLETED.
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.