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An air carrier flight crew on a B737-300 had a power interruption in the FMC circuit and afterwards the system started direct to a navigation point instead of intercepting a route to the navigation point. The controller contacted the flight crew and they corrected their track. Track heading deviation.
| Attributes | |
| ACN | 346080 |
| Time | |
| Date | 199608 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : orl |
| State Reference | FL |
| Altitude | msl bound lower : 12000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 20000 flight time type : 5000 |
| ASRS Report | 346080 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 15000 flight time type : 5000 |
| ASRS Report | 345744 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance non adherence : far other anomaly other other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Flight on aug/xx/96, from mlb to clt. Departing mlb climbing through approximately 12000 ft. We had been cleared to fly heading 270 degrees and intercept J53 north of orlando. Before the intercept, both fmcs went blank. After a short time they came back on. Suspected faulty circuit breaker. The aircraft then proceeded direct to barbs intersection. ATC asked if we were still on the intercept heading. First officer stated we were going to barbs intersection. We realized what had happened and reestablished the intercept heading for J53. The fmcs performed normally the rest of flight.
Original NASA ASRS Text
Title: AN ACR FLC ON A B737-300 HAD A PWR INTERRUPTION IN THE FMC CIRCUIT AND AFTERWARDS THE SYS STARTED DIRECT TO A NAV POINT INSTEAD OF INTERCEPTING A RTE TO THE NAV POINT. THE CTLR CONTACTED THE FLC AND THEY CORRECTED THEIR TRACK. TRACK HDG DEV.
Narrative: FLT ON AUG/XX/96, FROM MLB TO CLT. DEPARTING MLB CLBING THROUGH APPROX 12000 FT. WE HAD BEEN CLRED TO FLY HDG 270 DEGS AND INTERCEPT J53 N OF ORLANDO. BEFORE THE INTERCEPT, BOTH FMCS WENT BLANK. AFTER A SHORT TIME THEY CAME BACK ON. SUSPECTED FAULTY CIRCUIT BREAKER. THE ACFT THEN PROCEEDED DIRECT TO BARBS INTXN. ATC ASKED IF WE WERE STILL ON THE INTERCEPT HDG. FO STATED WE WERE GOING TO BARBS INTXN. WE REALIZED WHAT HAD HAPPENED AND REESTABLISHED THE INTERCEPT HDG FOR J53. THE FMCS PERFORMED NORMALLY THE REST OF FLT.
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.