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A B757-200 pilot reports that after departing bos on WYLYY5 RNAV procedure the FMS dropped waypoints.
| Attributes | |
| ACN | 689410 |
| Time | |
| Date | 200603 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : bos.airport |
| State Reference | MA |
| Altitude | msl single value : 400 |
| Environment | |
| Weather Elements | Windshear |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : bos.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial |
| Route In Use | departure sid : wylyy |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 689410 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
At gate briefed departure SID; verified WYLYY5 departure and waypoints. At departure end of runway; verified map procedure on checklist; runway; and aircraft touching. After takeoff and selecting LNAV; we noticed that the waypoints garve and wylyy was missing and the FMC was showing direct lycos. The captain flew the 273 degree heading for 2.2 DME and turned to a 235 degree heading. We were concerned that we did not stay within the noise abatement procedure. Once on a heading; ATC gave us a heading southbound and that was the end of the SID. I have never experienced this waypoint drop before.
Original NASA ASRS Text
Title: A B757-200 PLT RPTS THAT AFTER DEPARTING BOS ON WYLYY5 RNAV PROC THE FMS DROPPED WAYPOINTS.
Narrative: AT GATE BRIEFED DEP SID; VERIFIED WYLYY5 DEP AND WAYPOINTS. AT DEP END OF RWY; VERIFIED MAP PROC ON CHKLIST; RWY; AND ACFT TOUCHING. AFTER TKOF AND SELECTING LNAV; WE NOTICED THAT THE WAYPOINTS GARVE AND WYLYY WAS MISSING AND THE FMC WAS SHOWING DIRECT LYCOS. THE CAPT FLEW THE 273 DEG HDG FOR 2.2 DME AND TURNED TO A 235 DEG HDG. WE WERE CONCERNED THAT WE DID NOT STAY WITHIN THE NOISE ABATEMENT PROC. ONCE ON A HDG; ATC GAVE US A HDG SOUTHBOUND AND THAT WAS THE END OF THE SID. I HAVE NEVER EXPERIENCED THIS WAYPOINT DROP BEFORE.
Data retrieved from NASA's ASRS site as of January 2009 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.