DC9-50 has had equipment problem. Course deviation.

Attributes
ACN	322020
Time
Date	199511
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : eld
State Reference	TN
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zme
Operator	common carrier : air carrier
Make Model Name	DC-9 50
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	arrival star : star 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 : 150 flight time total : 16500 flight time type : 12000
ASRS Report	322020
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe other spatial deviation
Independent Detector	other controllera
Resolutory Action	other other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

I thought I was outbound 050 degrees of eld. Read 70 NM, change to O45 degrees mem. All looked correct. At this time, center said we were off course, issued vector to intercept. Everything seemed correct. Went back to eld and found 20 NM and full deviation on HSI. I can't figure out what I did, so don't know how to fix it.

Original NASA ASRS Text

Title: DC9-50 HAS HAD EQUIP PROB. COURSE DEV.

Narrative: I THOUGHT I WAS OUTBOUND 050 DEGS OF ELD. READ 70 NM, CHANGE TO O45 DEGS MEM. ALL LOOKED CORRECT. AT THIS TIME, CTR SAID WE WERE OFF COURSE, ISSUED VECTOR TO INTERCEPT. EVERYTHING SEEMED CORRECT. WENT BACK TO ELD AND FOUND 20 NM AND FULL DEV ON HSI. I CAN'T FIGURE OUT WHAT I DID, SO DON'T KNOW HOW TO FIX IT.

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.