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Track deviation.
| Attributes | |
| ACN | 141803 |
| Time | |
| Date | 199004 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : ewr |
| State Reference | NJ |
| Altitude | msl bound lower : 2000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude climbout : takeoff climbout : initial |
| Route In Use | departure other departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 200 flight time total : 9000 flight time type : 500 |
| ASRS Report | 141809 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
When departing ewr on runway 22L/right, the SID calls for a 190 degree heading, then a turn to 220 degrees at the runway 22 ilsq 3 DME. The common practice I see on the large transport/widebody transport is to either load ilsq into the fix page of the fmcs, or create a point at the ilsq 190/03 on the legs page as a reference for the turn to 220 degrees. The problem arises from the fact that the FMS position for the runway 22 ilsq is the localizer antenna position at the departure end of runway 22L. The DME transmitter is located at the approximately position of the G/south transmitter. This is a difference of about the length of runway 22L, or about 1.5 mi. I noted the following on departure with captain flying, and ilsq loaded into the FMS fix page. 1) while in position on 22R awaiting takeoff clearance, the FMS fix page indicated we were 2 mi from ilsq. The ilsq DME indicated .2 mi. 2) when the ilsq DME indicated 3 mi on departure, the FMS fix page was indicating 1 mi from ilsq. The captain, choosing to use the FMS position, continued on a heading of 190 degrees until the fix page indicated 3 mi from ilsq. At this time the ilsq DME indicated 4.8 mi.
Original NASA ASRS Text
Title: TRACK DEVIATION.
Narrative: WHEN DEPARTING EWR ON RWY 22L/R, THE SID CALLS FOR A 190 DEG HDG, THEN A TURN TO 220 DEGS AT THE RWY 22 ILSQ 3 DME. THE COMMON PRACTICE I SEE ON THE LGT/WDB IS TO EITHER LOAD ILSQ INTO THE FIX PAGE OF THE FMCS, OR CREATE A POINT AT THE ILSQ 190/03 ON THE LEGS PAGE AS A REF FOR THE TURN TO 220 DEGS. THE PROB ARISES FROM THE FACT THAT THE FMS POS FOR THE RWY 22 ILSQ IS THE LOC ANTENNA POS AT THE DEP END OF RWY 22L. THE DME XMITTER IS LOCATED AT THE APPROX POS OF THE G/S XMITTER. THIS IS A DIFFERENCE OF ABOUT THE LENGTH OF RWY 22L, OR ABOUT 1.5 MI. I NOTED THE FOLLOWING ON DEP WITH CAPT FLYING, AND ILSQ LOADED INTO THE FMS FIX PAGE. 1) WHILE IN POS ON 22R AWAITING TKOF CLRNC, THE FMS FIX PAGE INDICATED WE WERE 2 MI FROM ILSQ. THE ILSQ DME INDICATED .2 MI. 2) WHEN THE ILSQ DME INDICATED 3 MI ON DEP, THE FMS FIX PAGE WAS INDICATING 1 MI FROM ILSQ. THE CAPT, CHOOSING TO USE THE FMS POS, CONTINUED ON A HDG OF 190 DEGS UNTIL THE FIX PAGE INDICATED 3 MI FROM ILSQ. AT THIS TIME THE ILSQ DME INDICATED 4.8 MI.
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.