37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Attributes | |
ACN | 680770 |
Time | |
Date | 200512 |
Local Time Of Day | 0601 To 1200 |
Place | |
Locale Reference | airport : dfw.airport |
State Reference | TX |
Altitude | msl single value : 6000 |
Environment | |
Flight Conditions | VMC |
Light | Daylight |
Aircraft 1 | |
Controlling Facilities | tracon : d10.tracon |
Operator | common carrier : air carrier |
Make Model Name | EMB ERJ 135 ER&LR |
Operating Under FAR Part | Part 121 |
Navigation In Use | other Other |
Flight Phase | climbout : intermediate altitude |
Route In Use | departure sid : clare |
Flight Plan | IFR |
Person 1 | |
Affiliation | company : air carrier |
Function | flight crew : captain oversight : pic |
Experience | flight time last 90 days : 220 flight time type : 4000 |
ASRS Report | 680770 |
Person 2 | |
Affiliation | company : air carrier |
Function | flight crew : first officer |
Events | |
Anomaly | aircraft equipment problem : critical 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 Chart Or Publication Aircraft |
Primary Problem | Aircraft |
Narrative:
While departing dfw using an FMS SID the FMS initiated an early turn that may have resulted in an airspace deviation. The pre-takeoff procedures went normally. The clearance was received and included an FMS SID; the clare 2 with a departure from runway 17R. The SID was recalled from the FMS database and cross checked with the paper chart. The departure procedure was briefed and all company FMS SID procedures were followed. The takeoff and initial climb were uneventful. When approaching the first fix (which is due south of the airport; the next fix is 90 degrees to the east from the first fix) the FMS initiated its turn approximately 8 mi from the fix. This seemed unusual; but we understood it to be part of the FMS SID. The turn was gentle and intercepted the outbound from the first fix without difficulty. However; this slow turn (commanded by the FMS) was most likely outside protected airspace on the departure. Nothing was mentioned by ATC at the time. I feel the FMS in the EMB135/145 series aircraft should be evaluated for its ability to make 90 degree turns in the terminal environment. I have witnessed the FMS make painfully wide 90 degree turns in cruise; and I feel this tendency should be corrected prior to terminal operations using the FMS.
Original NASA ASRS Text
Title: E135 ON RNAV SID FROM DFW TURNS EARLY AND SLOWLY AND EXCEEDS TRACK PARAMETERS. RPTR SUGGESTS THE PERFORMANCE IS ENDEMIC TO THE FLEET.
Narrative: WHILE DEPARTING DFW USING AN FMS SID THE FMS INITIATED AN EARLY TURN THAT MAY HAVE RESULTED IN AN AIRSPACE DEV. THE PRE-TKOF PROCS WENT NORMALLY. THE CLRNC WAS RECEIVED AND INCLUDED AN FMS SID; THE CLARE 2 WITH A DEP FROM RWY 17R. THE SID WAS RECALLED FROM THE FMS DATABASE AND CROSS CHKED WITH THE PAPER CHART. THE DEP PROC WAS BRIEFED AND ALL COMPANY FMS SID PROCS WERE FOLLOWED. THE TKOF AND INITIAL CLB WERE UNEVENTFUL. WHEN APCHING THE FIRST FIX (WHICH IS DUE S OF THE ARPT; THE NEXT FIX IS 90 DEGS TO THE E FROM THE FIRST FIX) THE FMS INITIATED ITS TURN APPROX 8 MI FROM THE FIX. THIS SEEMED UNUSUAL; BUT WE UNDERSTOOD IT TO BE PART OF THE FMS SID. THE TURN WAS GENTLE AND INTERCEPTED THE OUTBOUND FROM THE FIRST FIX WITHOUT DIFFICULTY. HOWEVER; THIS SLOW TURN (COMMANDED BY THE FMS) WAS MOST LIKELY OUTSIDE PROTECTED AIRSPACE ON THE DEP. NOTHING WAS MENTIONED BY ATC AT THE TIME. I FEEL THE FMS IN THE EMB135/145 SERIES ACFT SHOULD BE EVALUATED FOR ITS ABILITY TO MAKE 90 DEG TURNS IN THE TERMINAL ENVIRONMENT. I HAVE WITNESSED THE FMS MAKE PAINFULLY WIDE 90 DEG TURNS IN CRUISE; AND I FEEL THIS TENDENCY SHOULD BE CORRECTED PRIOR TO TERMINAL OPS USING THE FMS.
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.