<< >> NASA ASRS Report 176898, April 1991

Air carrier PIC misprograms instruments in oceanic airspace and creates a heading track deviation. Probably 10 pt 5 miles south of course, 4 miles over allowed.

Attributes
ACN	176898
Time
Date	199104
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ozn
State Reference	FO
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : czqx
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : other oceanic enroute : atlantic
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 180 flight time total : 20000 flight time type : 1500
ASRS Report	176898
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
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:

After passing gla westbound to bos, I loaded additional waypoints into the INS (na track charlie). After this we were rerouted onto track bravo, 1 degree (60 mi) north. Although waypoint #5 (59N/50W) had been entered correctly (according to our rerte), as we approached waypoint #4 (61N 40W) I changed waypoint #5 to the original flight plan (58N 50W) because I had not completely blocked it out on our computer printout. The first officer and second officer, since they had already checked waypoint #5, started checking the newly entered waypoints with #6. After passing waypoint #4 by 10 mins, our position x-chk showed us south of course heading toward 58N 50W instead of 59N 50W. I immediately corrected to our filed course.

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Original NASA ASRS Text

Title: ACR PIC MISPROGRAMS INSTRUMENTS IN OCEANIC AIRSPACE AND CREATES A HEADING TRACK DEVIATION. PROBABLY 10 PT 5 MILES SOUTH OF COURSE, 4 MILES OVER ALLOWED.

Narrative: AFTER PASSING GLA WBND TO BOS, I LOADED ADDITIONAL WAYPOINTS INTO THE INS (NA TRACK CHARLIE). AFTER THIS WE WERE REROUTED ONTO TRACK BRAVO, 1 DEG (60 MI) N. ALTHOUGH WAYPOINT #5 (59N/50W) HAD BEEN ENTERED CORRECTLY (ACCORDING TO OUR RERTE), AS WE APCHED WAYPOINT #4 (61N 40W) I CHANGED WAYPOINT #5 TO THE ORIGINAL FLT PLAN (58N 50W) BECAUSE I HAD NOT COMPLETELY BLOCKED IT OUT ON OUR COMPUTER PRINTOUT. THE F/O AND S/O, SINCE THEY HAD ALREADY CHKED WAYPOINT #5, STARTED CHKING THE NEWLY ENTERED WAYPOINTS WITH #6. AFTER PASSING WAYPOINT #4 BY 10 MINS, OUR POS X-CHK SHOWED US S OF COURSE HDG TOWARD 58N 50W INSTEAD OF 59N 50W. I IMMEDIATELY CORRECTED TO OUR FILED COURSE.

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.