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A B737-300 at leveloff at FL290, right autothrottle did not reduce power. Crew discovered right throttle jammed at 92% N1. Declared an emergency and diverted.
| Attributes | |
| ACN | 512747 |
| Time | |
| Date | 200105 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zoa.artcc |
| State Reference | CA |
| Altitude | msl single value : 29000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc tower : atl.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 130 flight time total : 8000 flight time type : 108 |
| ASRS Report | 512747 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : multi engine pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 3200 flight time type : 441 |
| ASRS Report | 512750 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : right engine indications other flight crewa other flight crewb |
| Resolutory Action | flight crew : declared emergency flight crew : diverted to another airport |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Upon reaching FL290, autothrottle began to reduce power for cruise flight. Right throttle did not respond. Right throttle was found jammed at approximately 92% N1. Jam could not be undone. Contacted dispatch and maintenance problem could not be resolved. Opted to divert to sfo. Kept both engines running until aircraft weight was below maximum landing weight. Accomplished engine shutdown checklist and all other appropriate checklists and conducted an uneventful single engine landing at sfo. No damage to aircraft and no injuries to passenger. No ATC deviations requested or needed. Emergency was declared once divert decision was made. Callback conversation with reporter revealed the following information: the reporter stated the cause of the right engine throttle to be jammed in automatic and manual operation is unknown as maintenance did not advise the crew of the corrective action.
Original NASA ASRS Text
Title: A B737-300 AT LEVELOFF AT FL290, R AUTOTHROTTLE DID NOT REDUCE PWR. CREW DISCOVERED R THROTTLE JAMMED AT 92% N1. DECLARED AN EMER AND DIVERTED.
Narrative: UPON REACHING FL290, AUTOTHROTTLE BEGAN TO REDUCE PWR FOR CRUISE FLT. R THROTTLE DID NOT RESPOND. R THROTTLE WAS FOUND JAMMED AT APPROX 92% N1. JAM COULD NOT BE UNDONE. CONTACTED DISPATCH AND MAINT PROB COULD NOT BE RESOLVED. OPTED TO DIVERT TO SFO. KEPT BOTH ENGS RUNNING UNTIL ACFT WT WAS BELOW MAX LNDG WT. ACCOMPLISHED ENG SHUTDOWN CHKLIST AND ALL OTHER APPROPRIATE CHKLISTS AND CONDUCTED AN UNEVENTFUL SINGLE ENG LNDG AT SFO. NO DAMAGE TO ACFT AND NO INJURIES TO PAX. NO ATC DEVS REQUESTED OR NEEDED. EMER WAS DECLARED ONCE DIVERT DECISION WAS MADE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE R ENG THROTTLE TO BE JAMMED IN AUTO AND MANUAL OP IS UNKNOWN AS MAINT DID NOT ADVISE THE CREW OF THE CORRECTIVE ACTION.
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.