 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Departure runway was changed and FMC reprogrammed. Flight crew did not rechk FMC programming. Course deviation occurred due to inadvertent flight crew FMC programming.
| Attributes | |
| ACN | 292970 |
| Time | |
| Date | 199501 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : lax |
| State Reference | CA |
| Altitude | msl bound lower : 10000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax artcc : zab |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other departure sid : sid enroute airway : lax |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 130 flight time total : 17000 flight time type : 3600 |
| ASRS Report | 292970 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Assigned route out of lax was a loop 9 departure with a daggett runway transition. We had preprogrammed this in our FMC expecting to depart on runway 24L. A last min change at the runway 24L, we were switched to runway 24R. We put runway 24R in the FMC and departed. What we didn't know was that by changing our runway, the waypoints also changed on the departure. After crossing over the airport at 10000 ft and coupled up to the autoplt the routing took us from the lax VOR to seal beach VOR. This is when the departure controller told us we were off course and corrected us back on course with heading changes. No traffic conflicts occurred. After we were back on course we played with our FMC computers and found that if you don't reselect the departure and transition after changing runways, you get the wrong routing. Correct routing is cross lax VOR at 10000 ft or above outbound on the lax 041 degree radial over keggs and coopp intxns to daggett VOR. This was verified in our preflight checks. After changing from runway 24L to runway 24R the routing was not rechked and came up cross the lax VOR at 10000 ft or above direct seal beach VOR then depart seal beach on the seal beach 003 degree radial to the F060X fix which is the seal beach 003 degree radial 20 NM to intercept the daggett 222 degree radial to daggett. This can be avoided by reselecting the departure SID and transition after reselecting a runway. Our fleet manager will be informed of this and a reminder to other 757 pilots will be sent out so this doesn't happen to other pilots in the future.
Original NASA ASRS Text
Title: DEP RWY WAS CHANGED AND FMC REPROGRAMMED. FLC DID NOT RECHK FMC PROGRAMMING. COURSE DEV OCCURRED DUE TO INADVERTENT FLC FMC PROGRAMMING.
Narrative: ASSIGNED RTE OUT OF LAX WAS A LOOP 9 DEP WITH A DAGGETT RWY TRANSITION. WE HAD PREPROGRAMMED THIS IN OUR FMC EXPECTING TO DEPART ON RWY 24L. A LAST MIN CHANGE AT THE RWY 24L, WE WERE SWITCHED TO RWY 24R. WE PUT RWY 24R IN THE FMC AND DEPARTED. WHAT WE DIDN'T KNOW WAS THAT BY CHANGING OUR RWY, THE WAYPOINTS ALSO CHANGED ON THE DEP. AFTER XING OVER THE ARPT AT 10000 FT AND COUPLED UP TO THE AUTOPLT THE ROUTING TOOK US FROM THE LAX VOR TO SEAL BEACH VOR. THIS IS WHEN THE DEP CTLR TOLD US WE WERE OFF COURSE AND CORRECTED US BACK ON COURSE WITH HDG CHANGES. NO TFC CONFLICTS OCCURRED. AFTER WE WERE BACK ON COURSE WE PLAYED WITH OUR FMC COMPUTERS AND FOUND THAT IF YOU DON'T RESELECT THE DEP AND TRANSITION AFTER CHANGING RWYS, YOU GET THE WRONG ROUTING. CORRECT ROUTING IS CROSS LAX VOR AT 10000 FT OR ABOVE OUTBOUND ON THE LAX 041 DEG RADIAL OVER KEGGS AND COOPP INTXNS TO DAGGETT VOR. THIS WAS VERIFIED IN OUR PREFLT CHKS. AFTER CHANGING FROM RWY 24L TO RWY 24R THE ROUTING WAS NOT RECHKED AND CAME UP CROSS THE LAX VOR AT 10000 FT OR ABOVE DIRECT SEAL BEACH VOR THEN DEPART SEAL BEACH ON THE SEAL BEACH 003 DEG RADIAL TO THE F060X FIX WHICH IS THE SEAL BEACH 003 DEG RADIAL 20 NM TO INTERCEPT THE DAGGETT 222 DEG RADIAL TO DAGGETT. THIS CAN BE AVOIDED BY RESELECTING THE DEP SID AND TRANSITION AFTER RESELECTING A RWY. OUR FLEET MGR WILL BE INFORMED OF THIS AND A REMINDER TO OTHER 757 PLTS WILL BE SENT OUT SO THIS DOESN'T HAPPEN TO OTHER PLTS IN THE FUTURE.
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.