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A B737-300 the first flight after #2 engine change experienced #2 throttle restr to 90% N1 power. Shutdown engine on approach to terminating airport.
| Attributes | |
| ACN | 362338 |
| Time | |
| Date | 199702 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz |
| State Reference | US |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| ASRS Report | 362338 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| ASRS Report | 362339 |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure non adherence : far other anomaly other |
| Independent Detector | other flight crewa other other : unspecified cockpit |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
In feb/97, 2 abc mechanics were sent to ZZZ to do a dynamic rig of the variable stator vanes on #2 engine on a B737-300, due to slow acceleration of this engine. The engine failed the acceleration test after the dynamic rig, so 2 other mechanics were also sent to help change the main engine control. These mechanics were unable to complete the main engine control change in the allowed time per our maintenance manual, so 3 more mechanics were sent to complete and inspect the main engine control installation. The engine again failed the acceleration test and it was then decided to change the engine. All of the mechanics that were in ZZZ were now sent back to abc. 6 other mechanics were now sent to ZZZ to accomplish the engine change. These mechanics now worked 24+ hours straight to complete the engine change (a practice against the maintenance manual). When the aircraft left ZZZ on a revenue flight to abc, the flight crew was unable to retard #2 engine below 90% N1 and had to do an in-flight shutdown on final approach into abc. It was discovered that a 10-32 nut was left in the throttle box, that prevented the flight crew from retarding #2 engine throttle.
Original NASA ASRS Text
Title: A B737-300 THE FIRST FLT AFTER #2 ENG CHANGE EXPERIENCED #2 THROTTLE RESTR TO 90% N1 PWR. SHUTDOWN ENG ON APCH TO TERMINATING ARPT.
Narrative: IN FEB/97, 2 ABC MECHS WERE SENT TO ZZZ TO DO A DYNAMIC RIG OF THE VARIABLE STATOR VANES ON #2 ENG ON A B737-300, DUE TO SLOW ACCELERATION OF THIS ENG. THE ENG FAILED THE ACCELERATION TEST AFTER THE DYNAMIC RIG, SO 2 OTHER MECHS WERE ALSO SENT TO HELP CHANGE THE MAIN ENG CTL. THESE MECHS WERE UNABLE TO COMPLETE THE MAIN ENG CTL CHANGE IN THE ALLOWED TIME PER OUR MAINT MANUAL, SO 3 MORE MECHS WERE SENT TO COMPLETE AND INSPECT THE MAIN ENG CTL INSTALLATION. THE ENG AGAIN FAILED THE ACCELERATION TEST AND IT WAS THEN DECIDED TO CHANGE THE ENG. ALL OF THE MECHS THAT WERE IN ZZZ WERE NOW SENT BACK TO ABC. 6 OTHER MECHS WERE NOW SENT TO ZZZ TO ACCOMPLISH THE ENG CHANGE. THESE MECHS NOW WORKED 24+ HRS STRAIGHT TO COMPLETE THE ENG CHANGE (A PRACTICE AGAINST THE MAINT MANUAL). WHEN THE ACFT LEFT ZZZ ON A REVENUE FLT TO ABC, THE FLC WAS UNABLE TO RETARD #2 ENG BELOW 90% N1 AND HAD TO DO AN INFLT SHUTDOWN ON FINAL APCH INTO ABC. IT WAS DISCOVERED THAT A 10-32 NUT WAS LEFT IN THE THROTTLE BOX, THAT PREVENTED THE FLC FROM RETARDING #2 ENG THROTTLE.
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.