 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Arriving at cruise altitude an EMB145 crew discovers that the thrust limit selected was in the takeoff mode.
| Attributes | |
| ACN | 711577 |
| Time | |
| Date | 200609 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zfw.artcc |
| State Reference | TX |
| Altitude | msl single value : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 711577 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 711576 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Ambiguous |
Narrative:
When leveling off at cruise altitude we noticed that the engines were in takeoff #1 thrust mode. This event occurred after the climb checklist had been completed and numerous ATC altitude leveloffs for traffic had been complied with. The itt at that point was 823 and it had been 26 mins since takeoff. Since there was no way to know if the 5 min limitation had been exceeded the event was written up in the maintenance log and cmh maintenance was informed. The next day a line maintenance technician checked for me and he said the cmc download had not indicated that a limitations exceedance had occurred. Supplemental information from acn 711576: during the climb; we did monitor the EICAS page; and did not observe any amber or red parameters at any time. We determined that it may have been possible that the thrust levers had been inadvertently advanced or bumped past the thrust-set detent during thrust advancement for climb; even temporarily. When the captain selected cruise thrust at FL350; the thrust setting did accept this command; indicating that at that time; the thrust levers were not forward of the thrust set detent.
Original NASA ASRS Text
Title: ARRIVING AT CRUISE ALT AN EMB145 CREW DISCOVERS THAT THE THRUST LIMIT SELECTED WAS IN THE TKOF MODE.
Narrative: WHEN LEVELING OFF AT CRUISE ALT WE NOTICED THAT THE ENGS WERE IN TKOF #1 THRUST MODE. THIS EVENT OCCURRED AFTER THE CLB CHKLIST HAD BEEN COMPLETED AND NUMEROUS ATC ALT LEVELOFFS FOR TFC HAD BEEN COMPLIED WITH. THE ITT AT THAT POINT WAS 823 AND IT HAD BEEN 26 MINS SINCE TKOF. SINCE THERE WAS NO WAY TO KNOW IF THE 5 MIN LIMITATION HAD BEEN EXCEEDED THE EVENT WAS WRITTEN UP IN THE MAINT LOG AND CMH MAINT WAS INFORMED. THE NEXT DAY A LINE MAINT TECHNICIAN CHKED FOR ME AND HE SAID THE CMC DOWNLOAD HAD NOT INDICATED THAT A LIMITATIONS EXCEEDANCE HAD OCCURRED. SUPPLEMENTAL INFO FROM ACN 711576: DURING THE CLB; WE DID MONITOR THE EICAS PAGE; AND DID NOT OBSERVE ANY AMBER OR RED PARAMETERS AT ANY TIME. WE DETERMINED THAT IT MAY HAVE BEEN POSSIBLE THAT THE THRUST LEVERS HAD BEEN INADVERTENTLY ADVANCED OR BUMPED PAST THE THRUST-SET DETENT DURING THRUST ADVANCEMENT FOR CLB; EVEN TEMPORARILY. WHEN THE CAPT SELECTED CRUISE THRUST AT FL350; THE THRUST SETTING DID ACCEPT THIS COMMAND; INDICATING THAT AT THAT TIME; THE THRUST LEVERS WERE NOT FORWARD OF THE THRUST SET DETENT.
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.