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A B737-200 on approach declared an emergency due to a jammed #2 throttle caused by the autothrottle transducer attach bolt loose blocking the throttle lever.
| Attributes | |
| ACN | 457810 |
| Time | |
| Date | 199912 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance lead technician : 11 maintenance technician : 6 |
| ASRS Report | 457810 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other other : 1 |
| Resolutory Action | flight crew : landed in emergency condition |
| Consequence | other |
| Factors | |
| Maintenance | performance deficiency : inspection performance deficiency : testing performance deficiency : installation |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
On dec/fri/99 air carrier ship xyz on flight XXX declared an emergency on approach to ZZZ. The emergency was declared due to a jammed right engine throttle. Air carrier maintenance in ZZZ found the right engine autothrottle lvdt lower attach bolt had become loose, thus binding the throttle lever. On dec/thu/99 I worked this aircraft with 3 other mechanics. The right engine throttle xover shaft was replaced due to stiff throttle. The autothrottle lvdt is attached to the xover shaft. I feel the close up inspection may have overlooked the security of this bolt.
Original NASA ASRS Text
Title: A B737-200 ON APCH DECLARED AN EMER DUE TO A JAMMED #2 THROTTLE CAUSED BY THE AUTOTHROTTLE TRANSDUCER ATTACH BOLT LOOSE BLOCKING THE THROTTLE LEVER.
Narrative: ON DEC/FRI/99 ACR SHIP XYZ ON FLT XXX DECLARED AN EMER ON APCH TO ZZZ. THE EMER WAS DECLARED DUE TO A JAMMED R ENG THROTTLE. ACR MAINT IN ZZZ FOUND THE R ENG AUTOTHROTTLE LVDT LOWER ATTACH BOLT HAD BECOME LOOSE, THUS BINDING THE THROTTLE LEVER. ON DEC/THU/99 I WORKED THIS ACFT WITH 3 OTHER MECHS. THE R ENG THROTTLE XOVER SHAFT WAS REPLACED DUE TO STIFF THROTTLE. THE AUTOTHROTTLE LVDT IS ATTACHED TO THE XOVER SHAFT. I FEEL THE CLOSE UP INSPECTION MAY HAVE OVERLOOKED THE SECURITY OF THIS BOLT.
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.