<< >> NASA ASRS Report 366771, April 1997

4 engine widebody transport over pacific makes improper turn at waypoint because no other waypoints had been entered in the INS.

Attributes
ACN	366771
Time
Date	199704
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sya
State Reference	AK
Altitude	msl bound lower : 37000 msl bound upper : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : jfk
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : pacific enroute airway : r220
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 16000 flight time type : 5000
ASRS Report	366771
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 180 flight time total : 14500 flight time type : 7000
ASRS Report	366770
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	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:

At nippi intersection on R220, aircraft made left turn as was expected to next waypoint. The true heading was to change from 236 degrees of turn to 238 degrees of turn. After 40 degrees of turn, I realized the turn was too much and selected heading on INS and started a right turn. I then realized we had passed the last waypoint entered in the INS. I entered the next waypoint and we were 23 mi left of course. A 40 degree correction was initiated to return to course. We were 3 mins late at nubda, the next reporting point. No conflict with another aircraft occurred. The reason for the deviation was I neglected to enter the next group of waypoints. This is to be done some time before reaching the last waypoint which I neglected to do.

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Original NASA ASRS Text

Title: 4 ENG WDB OVER PACIFIC MAKES IMPROPER TURN AT WAYPOINT BECAUSE NO OTHER WAYPOINTS HAD BEEN ENTERED IN THE INS.

Narrative: AT NIPPI INTXN ON R220, ACFT MADE L TURN AS WAS EXPECTED TO NEXT WAYPOINT. THE TRUE HDG WAS TO CHANGE FROM 236 DEGS OF TURN TO 238 DEGS OF TURN. AFTER 40 DEGS OF TURN, I REALIZED THE TURN WAS TOO MUCH AND SELECTED HDG ON INS AND STARTED A R TURN. I THEN REALIZED WE HAD PASSED THE LAST WAYPOINT ENTERED IN THE INS. I ENTERED THE NEXT WAYPOINT AND WE WERE 23 MI L OF COURSE. A 40 DEG CORRECTION WAS INITIATED TO RETURN TO COURSE. WE WERE 3 MINS LATE AT NUBDA, THE NEXT RPTING POINT. NO CONFLICT WITH ANOTHER ACFT OCCURRED. THE REASON FOR THE DEV WAS I NEGLECTED TO ENTER THE NEXT GROUP OF WAYPOINTS. THIS IS TO BE DONE SOME TIME BEFORE REACHING THE LAST WAYPOINT WHICH I NEGLECTED TO DO.

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.