Gross navigational error occurs when flight crew fails to note aircraft equipment status after loss of #1 generator. Heading track deviation produces position deviation.

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Attributes
ACN	202701
Time
Date	199202
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : rpmm
State Reference	FO
Altitude	msl bound lower : 29000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
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 : pacific enroute : other oceanic enroute airway : a589
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 75 flight time total : 16000 flight time type : 200
ASRS Report	202701
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	202700
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While en route from singapore to taipei on airway A589 approaching patka intersection we lost #1 generator. This caused the autoplt to trip off. We restored electrics and reengaged the autoplt. In the confusion of restoring the aircraft and attempting position reports on very poor HF conditions I did not realize that the autoplt came back on in the heading mode and not in the inertial mode. The aircraft did not make a 409 degree heading change to continue toward dovel intersection. The aircraft got considerably off course before I recognized the problem. I was over open ocean and had not crossed any airways and unable to contact anyone on the HF radio so I proceeded direct to dovel intersection.

Original NASA ASRS Text

Title: GROSS NAVIGATIONAL ERROR OCCURS WHEN FLC FAILS TO NOTE ACFT EQUIP STATUS AFTER LOSS OF #1 GENERATOR. HDG TRACK DEV PRODUCES POS DEV.

Narrative: WHILE ENRTE FROM SINGAPORE TO TAIPEI ON AIRWAY A589 APCHING PATKA INTXN WE LOST #1 GENERATOR. THIS CAUSED THE AUTOPLT TO TRIP OFF. WE RESTORED ELECTRICS AND REENGAGED THE AUTOPLT. IN THE CONFUSION OF RESTORING THE ACFT AND ATTEMPTING POS RPTS ON VERY POOR HF CONDITIONS I DID NOT REALIZE THAT THE AUTOPLT CAME BACK ON IN THE HDG MODE AND NOT IN THE INERTIAL MODE. THE ACFT DID NOT MAKE A 409 DEG HDG CHANGE TO CONTINUE TOWARD DOVEL INTXN. THE ACFT GOT CONSIDERABLY OFF COURSE BEFORE I RECOGNIZED THE PROBLEM. I WAS OVER OPEN OCEAN AND HAD NOT CROSSED ANY AIRWAYS AND UNABLE TO CONTACT ANYONE ON THE HF RADIO SO I PROCEEDED DIRECT TO DOVEL INTXN.

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.