 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
An air carrier aircraft departing from phl climbs to altitude using the FMC to intercept the cleared course, however, inputs to the FMC are in error and the flight crew flies for a while off the cleared course. Flight crew becomes aware of the mechanics of what caused their error.
| Attributes | |
| ACN | 361470 |
| Time | |
| Date | 199702 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : phl |
| State Reference | PA |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 225 flight time total : 15000 flight time type : 4500 |
| ASRS Report | 361470 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : clearance other spatial deviation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Departed phl and cleared direct modena. Assigned 280 degree heading to intercept J48 to mol. Captain entered intercept leg to mol on FMS. Aircraft was found to be left of course and subsequently corrected as we were cleared direct to casanova. No other aircraft conflict in area. Upon execution of FMS to intercept leg on course, captain executed leg to mol instead of the next fix on J48. All fixes prior to mol were subsequently dropped (EMI and csn). Aircraft did not intercept correct routing due to this leg change in the airway. Always verify that when intercepting a route to a fix with the FMS, always intercept the next leg to the next point. The PNF should always verify the correct bearing on intercept on the CDU screen. Examine the correct route on the route page, then select legs page to find the next point on the airway. This technique will always assure correct airway intercept.
Original NASA ASRS Text
Title: AN ACR ACFT DEPARTING FROM PHL CLBS TO ALT USING THE FMC TO INTERCEPT THE CLRED COURSE, HOWEVER, INPUTS TO THE FMC ARE IN ERROR AND THE FLC FLIES FOR A WHILE OFF THE CLRED COURSE. FLC BECOMES AWARE OF THE MECHANICS OF WHAT CAUSED THEIR ERROR.
Narrative: DEPARTED PHL AND CLRED DIRECT MODENA. ASSIGNED 280 DEG HDG TO INTERCEPT J48 TO MOL. CAPT ENTERED INTERCEPT LEG TO MOL ON FMS. ACFT WAS FOUND TO BE L OF COURSE AND SUBSEQUENTLY CORRECTED AS WE WERE CLRED DIRECT TO CASANOVA. NO OTHER ACFT CONFLICT IN AREA. UPON EXECUTION OF FMS TO INTERCEPT LEG ON COURSE, CAPT EXECUTED LEG TO MOL INSTEAD OF THE NEXT FIX ON J48. ALL FIXES PRIOR TO MOL WERE SUBSEQUENTLY DROPPED (EMI AND CSN). ACFT DID NOT INTERCEPT CORRECT ROUTING DUE TO THIS LEG CHANGE IN THE AIRWAY. ALWAYS VERIFY THAT WHEN INTERCEPTING A RTE TO A FIX WITH THE FMS, ALWAYS INTERCEPT THE NEXT LEG TO THE NEXT POINT. THE PNF SHOULD ALWAYS VERIFY THE CORRECT BEARING ON INTERCEPT ON THE CDU SCREEN. EXAMINE THE CORRECT RTE ON THE RTE PAGE, THEN SELECT LEGS PAGE TO FIND THE NEXT POINT ON THE AIRWAY. THIS TECHNIQUE WILL ALWAYS ASSURE CORRECT AIRWAY INTERCEPT.
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.