Heading track deviation.

Attributes
ACN	206204
Time
Date	199203
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other cruise other descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 23000 flight time type : 1200
ASRS Report	206204
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 72 flight time total : 10000 flight time type : 600
ASRS Report	207139
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : overcame equipment problem flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

First officer flying. After final vector and 'cleared for approach 26R' relief pilot and first officer try to reset a 'no land 3' condition. Successfully. For reasons not known aircraft does not capture localizer. Captain to first officer: 'you went through it. Turn back go to raw data!' approach control:' air carrier XXX turn right 310 and re-intercept.' captain to first officer: 'turn further! You are flying 280 degree, turn to 31 degree.' first officer to captain: ' I already have a 45 degree intercept heading. Something is wrong here!' captain sees first officer's CDI lined up with approximately 230-250 heading (ILS heading is 270 degrees) creating the illusion that 280 degree is a 45 degree intercept. Check ILS heading window and captain's 'raw data' find all correct except first officer's CDI. Total deviation approximately 1/2 mi left of localizer. Re-establish proper course within about 2 mi. Uneventful approach and landing. First officer's incorrect CDI indication remained 'till aircraft parked at the gate. Maintenance notified.

Original NASA ASRS Text

Title: HDG TRACK DEV.

Narrative: FO FLYING. AFTER FINAL VECTOR AND 'CLRED FOR APCH 26R' RELIEF PLT AND FO TRY TO RESET A 'NO LAND 3' CONDITION. SUCCESSFULLY. FOR REASONS NOT KNOWN ACFT DOES NOT CAPTURE LOC. CAPT TO FO: 'YOU WENT THROUGH IT. TURN BACK GO TO RAW DATA!' APCH CTL:' ACR XXX TURN R 310 AND RE-INTERCEPT.' CAPT TO FO: 'TURN FURTHER! YOU ARE FLYING 280 DEG, TURN TO 31 DEG.' FO TO CAPT: ' I ALREADY HAVE A 45 DEG INTERCEPT HDG. SOMETHING IS WRONG HERE!' CAPT SEES FO'S CDI LINED UP WITH APPROX 230-250 HDG (ILS HDG IS 270 DEGS) CREATING THE ILLUSION THAT 280 DEG IS A 45 DEG INTERCEPT. CHK ILS HDG WINDOW AND CAPT'S 'RAW DATA' FIND ALL CORRECT EXCEPT FO'S CDI. TOTAL DEV APPROX 1/2 MI L OF LOC. RE-ESTABLISH PROPER COURSE WITHIN ABOUT 2 MI. UNEVENTFUL APCH AND LNDG. FO'S INCORRECT CDI INDICATION REMAINED 'TILL ACFT PARKED AT THE GATE. MAINT NOTIFIED.

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.