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An F100 first officer experienced a #2 engine rollback to flight idle. 5 mins later, the engine somehow restored itself and worked properly for the rest of the flight.
| Attributes | |
| ACN | 450609 |
| Time | |
| Date | 199909 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : ord.airport |
| State Reference | IL |
| Altitude | msl bound lower : 33000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : descent cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| ASRS Report | 450609 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : company policies |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : overcame equipment problem flight crew : regained aircraft control |
| Consequence | other |
| Supplementary | |
| Problem Areas | Company Maintenance Human Performance Aircraft |
| Primary Problem | Company |
Narrative:
We were descending from FL350 to FL330 when #2 engine rolled back to flight idle. We were in the clouds with engine and wing/tail anti-ice on. There were no indications of icing. Both throttles were aligned. #1 engine/throttle went to maximum climb power and #2 engine indications were idle power while we continued the descent towards 15000 ft. The standby engine indicator verified the primary engine indications on the MFDU that #2 engine was near idle. Vibration indicator was normal. #2 engine would not respond to movements of #2 throttle. We had a slight yaw of the airplane corrected by rudder. After 5 mins, engine came back to full power and worked properly the rest of the flight into ord. After landing, we wrote up the #2 engine. Ord maintenance personnel took the airplane OTS and said that this airplane had not had the fuel control unit modification for the F100 and that this type of engine rollback could happen. I believe that modifications and problems like this should be communicated to the flcs so that we can anticipate these types of events and respond properly. Lack of proper information to the flight crew that the company knew about could have been very useful during this event.
Original NASA ASRS Text
Title: AN F100 FO EXPERIENCED A #2 ENG ROLLBACK TO FLT IDLE. 5 MINS LATER, THE ENG SOMEHOW RESTORED ITSELF AND WORKED PROPERLY FOR THE REST OF THE FLT.
Narrative: WE WERE DSNDING FROM FL350 TO FL330 WHEN #2 ENG ROLLED BACK TO FLT IDLE. WE WERE IN THE CLOUDS WITH ENG AND WING/TAIL ANTI-ICE ON. THERE WERE NO INDICATIONS OF ICING. BOTH THROTTLES WERE ALIGNED. #1 ENG/THROTTLE WENT TO MAX CLB PWR AND #2 ENG INDICATIONS WERE IDLE PWR WHILE WE CONTINUED THE DSCNT TOWARDS 15000 FT. THE STANDBY ENG INDICATOR VERIFIED THE PRIMARY ENG INDICATIONS ON THE MFDU THAT #2 ENG WAS NEAR IDLE. VIBRATION INDICATOR WAS NORMAL. #2 ENG WOULD NOT RESPOND TO MOVEMENTS OF #2 THROTTLE. WE HAD A SLIGHT YAW OF THE AIRPLANE CORRECTED BY RUDDER. AFTER 5 MINS, ENG CAME BACK TO FULL PWR AND WORKED PROPERLY THE REST OF THE FLT INTO ORD. AFTER LNDG, WE WROTE UP THE #2 ENG. ORD MAINT PERSONNEL TOOK THE AIRPLANE OTS AND SAID THAT THIS AIRPLANE HAD NOT HAD THE FUEL CTL UNIT MODIFICATION FOR THE F100 AND THAT THIS TYPE OF ENG ROLLBACK COULD HAPPEN. I BELIEVE THAT MODIFICATIONS AND PROBS LIKE THIS SHOULD BE COMMUNICATED TO THE FLCS SO THAT WE CAN ANTICIPATE THESE TYPES OF EVENTS AND RESPOND PROPERLY. LACK OF PROPER INFO TO THE FLC THAT THE COMPANY KNEW ABOUT COULD HAVE BEEN VERY USEFUL DURING THIS EVENT.
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.