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A descending lear 25 overshoots its assigned altitude after losing the right engine when the fuel control unit cannot supply the correct fuel flow to the engine during the fingr 3 arrival into ads, tx.
| Attributes | |
| ACN | 449813 |
| Time | |
| Date | 199909 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zfw.artcc |
| State Reference | TX |
| Altitude | msl bound lower : 21500 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zfw.artcc |
| Operator | general aviation : personal |
| Make Model Name | Learjet 25 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other vortac |
| Flight Phase | descent : vacating altitude |
| Route In Use | arrival star : fingr three |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : first officer oversight : pic |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 40 flight time total : 6000 flight time type : 1200 |
| ASRS Report | 449813 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : captain |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 95 flight time total : 2800 flight time type : 575 |
| ASRS Report | 448856 |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : overshoot non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : mode c other controllera |
| Resolutory Action | controller : issued new clearance flight crew : landed in emergency condition |
| Consequence | other |
| Supplementary | |
| Problem Areas | Environmental Factor Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During a relocation flight from frg to ads, we experienced fuel flow and itt fluctuations, accompanied by engine surges. We reduced power on the r-hand engine and turned off the fuel computer. We brought the engine back up to power and resumed our trip with the computer in the manual mode. All was well and good until we started our descent on the fingr 3 arrival to ads airport. Our descent clearance was 'cleared to FL240 expect fingr at 9000 ft.' during power reduction for the descent the r-hand engine flamed out. While we were securing the engine, ATC requested our altitude. At that time I replied 'FL215 with an engine failure.' we were then cleared to 9000 ft and asked if we were declaring an emergency. We declined the emergency and continued our descent. We attempted to relight the engine using both windmilling and starter assisted engine start to no avail. We resecured the engine and arrived uneventfully at our destination on 1 engine. The cause for the engine failure was a defective fuel control unit on the engine. The cause for descending below an assigned altitude was the flight crew's diverted attention to relight envelope charts, securing procedures, fuel management, etc. We did request men and equipment, crash fire rescue equipment, to be standing by at addison airport for our arrival. Supplemental information from acn 448856: WX was VMC and there was no conflicting traffic. During the continued descent, we attempted windmilling and starter assisted restarts with no success, and the engine was secured according to the flight manual procedures.
Original NASA ASRS Text
Title: A DSNDING LEAR 25 OVERSHOOTS ITS ASSIGNED ALT AFTER LOSING THE R ENG WHEN THE FUEL CTL UNIT CANNOT SUPPLY THE CORRECT FUEL FLOW TO THE ENG DURING THE FINGR 3 ARR INTO ADS, TX.
Narrative: DURING A RELOCATION FLT FROM FRG TO ADS, WE EXPERIENCED FUEL FLOW AND ITT FLUCTUATIONS, ACCOMPANIED BY ENG SURGES. WE REDUCED PWR ON THE R-HAND ENG AND TURNED OFF THE FUEL COMPUTER. WE BROUGHT THE ENG BACK UP TO PWR AND RESUMED OUR TRIP WITH THE COMPUTER IN THE MANUAL MODE. ALL WAS WELL AND GOOD UNTIL WE STARTED OUR DSCNT ON THE FINGR 3 ARR TO ADS ARPT. OUR DSCNT CLRNC WAS 'CLRED TO FL240 EXPECT FINGR AT 9000 FT.' DURING PWR REDUCTION FOR THE DSCNT THE R-HAND ENG FLAMED OUT. WHILE WE WERE SECURING THE ENG, ATC REQUESTED OUR ALT. AT THAT TIME I REPLIED 'FL215 WITH AN ENG FAILURE.' WE WERE THEN CLRED TO 9000 FT AND ASKED IF WE WERE DECLARING AN EMER. WE DECLINED THE EMER AND CONTINUED OUR DSCNT. WE ATTEMPTED TO RELIGHT THE ENG USING BOTH WINDMILLING AND STARTER ASSISTED ENG START TO NO AVAIL. WE RESECURED THE ENG AND ARRIVED UNEVENTFULLY AT OUR DEST ON 1 ENG. THE CAUSE FOR THE ENG FAILURE WAS A DEFECTIVE FUEL CTL UNIT ON THE ENG. THE CAUSE FOR DSNDING BELOW AN ASSIGNED ALT WAS THE FLC'S DIVERTED ATTN TO RELIGHT ENVELOPE CHARTS, SECURING PROCS, FUEL MGMNT, ETC. WE DID REQUEST MEN AND EQUIP, CFR, TO BE STANDING BY AT ADDISON ARPT FOR OUR ARR. SUPPLEMENTAL INFO FROM ACN 448856: WX WAS VMC AND THERE WAS NO CONFLICTING TFC. DURING THE CONTINUED DSCNT, WE ATTEMPTED WINDMILLING AND STARTER ASSISTED RESTARTS WITH NO SUCCESS, AND THE ENG WAS SECURED ACCORDING TO THE FLT MANUAL PROCS.
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.