Small transport has HSI problem after takeoff. Heading deviation.

Attributes
ACN	291519
Time
Date	199412
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mke
State Reference	WI
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mke
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 6500 flight time type : 5000
ASRS Report	291519
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

After being cleared for takeoff on runway 19R from mke airport the line up checklist was performed. Tower gave instruction to turn to a heading of 260 degrees after takeoff. While executing the turn to 260 degrees the HSI precessed during the procedure and stopping the turn at 260 degrees as indicated by the HSI, tower asked what heading we were on and we replied 260 degrees. Mke tower informed us that our heading was not 260 degrees and gave a turn of about 40 degrees back to the south and had us hold the heading. After checking HSI, against the magnetic compass, heading then showed the correct heading after setting it to the compass. During course of flight the HSI heading would precess 2 more times, a total of 10 degrees each, before being reset. The flight was continued to indianapolis with HSI selected to directional gyroscope mode with no further problems. Once arriving in indianapolis, maintenance was informed and a replacement of the HSI was performed.

Original NASA ASRS Text

Title: SMT HAS HSI PROB AFTER TKOF. HDG DEV.

Narrative: AFTER BEING CLRED FOR TKOF ON RWY 19R FROM MKE ARPT THE LINE UP CHKLIST WAS PERFORMED. TWR GAVE INSTRUCTION TO TURN TO A HDG OF 260 DEGS AFTER TKOF. WHILE EXECUTING THE TURN TO 260 DEGS THE HSI PRECESSED DURING THE PROC AND STOPPING THE TURN AT 260 DEGS AS INDICATED BY THE HSI, TWR ASKED WHAT HDG WE WERE ON AND WE REPLIED 260 DEGS. MKE TWR INFORMED US THAT OUR HDG WAS NOT 260 DEGS AND GAVE A TURN OF ABOUT 40 DEGS BACK TO THE S AND HAD US HOLD THE HDG. AFTER CHKING HSI, AGAINST THE MAGNETIC COMPASS, HDG THEN SHOWED THE CORRECT HDG AFTER SETTING IT TO THE COMPASS. DURING COURSE OF FLT THE HSI HDG WOULD PRECESS 2 MORE TIMES, A TOTAL OF 10 DEGS EACH, BEFORE BEING RESET. THE FLT WAS CONTINUED TO INDIANAPOLIS WITH HSI SELECTED TO DIRECTIONAL GYROSCOPE MODE WITH NO FURTHER PROBS. ONCE ARRIVING IN INDIANAPOLIS, MAINT WAS INFORMED AND A REPLACEMENT OF THE HSI WAS PERFORMED.

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.