Heading track deviation experienced when aircraft equipment problem surfaces.

Attributes
ACN	206552
Time
Date	199203
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : svm
State Reference	MI
Altitude	msl bound lower : 23000 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 15000 flight time type : 600
ASRS Report	206552
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Flight, large transport, was radar vectored to intercept J70 prior to intercept captain's (PF) FMGC #1 had a momentary timeout. System reset to normal, with indications that all was normal, when in reality captain's navigation display was latched to #2 FMGC. When navigation display range was selected to monitor intercept, #1 navigation display lost map display. Switching back to navigation, received ATC heading for on course. Flight was probably 3-5 mi off course due to the time to discover problem with aircraft navigation display, showing FMGC operation normal. Logbook entry made and reported to maintenance, according to aircraft manual. Problem is presently under study.

Original NASA ASRS Text

Title: HDG TRACK DEV EXPERIENCED WHEN ACFT EQUIP PROBLEM SURFACES.

Narrative: FLT, LGT, WAS RADAR VECTORED TO INTERCEPT J70 PRIOR TO INTERCEPT CAPT'S (PF) FMGC #1 HAD A MOMENTARY TIMEOUT. SYS RESET TO NORMAL, WITH INDICATIONS THAT ALL WAS NORMAL, WHEN IN REALITY CAPT'S NAV DISPLAY WAS LATCHED TO #2 FMGC. WHEN NAV DISPLAY RANGE WAS SELECTED TO MONITOR INTERCEPT, #1 NAV DISPLAY LOST MAP DISPLAY. SWITCHING BACK TO NAV, RECEIVED ATC HDG FOR ON COURSE. FLT WAS PROBABLY 3-5 MI OFF COURSE DUE TO THE TIME TO DISCOVER PROBLEM WITH ACFT NAV DISPLAY, SHOWING FMGC OP NORMAL. LOGBOOK ENTRY MADE AND RPTED TO MAINT, ACCORDING TO ACFT MANUAL. PROBLEM IS PRESENTLY UNDER STUDY.

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.