An large transport air carrier crew had an hdi failure in flight. They landed uneventfully at an en route airport, fixed the problem, and continued their trip.

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Attributes
ACN	210250
Time
Date	199205
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ind
State Reference	IN
Altitude	msl bound lower : 22000 msl bound upper : 22000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other landing other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 12000 flight time type : 180
ASRS Report	210250
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : exited adverse environment other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During climb out from cle, the roll monitor light came on accompanied by a gyroscope flag in the first officer hdi. This lasted for just a few seconds, then returned to normal. As the flight progressed, this condition repeated. I determined the first officer vertical gyroscope failed. I called dispatch and decided stl WX was unsuitable with the loss of the first officer's vertical gyroscope. With dispatch concurrence, we changed our destination to ind which was reported clear. Maintenance fixed the problem. The continuation of flight X from ind to stl was uneventful.

Original NASA ASRS Text

Title: AN LGT ACR CREW HAD AN HDI FAILURE IN FLT. THEY LANDED UNEVENTFULLY AT AN ENRTE ARPT, FIXED THE PROBLEM, AND CONTINUED THEIR TRIP.

Narrative: DURING CLB OUT FROM CLE, THE ROLL MONITOR LIGHT CAME ON ACCOMPANIED BY A GYROSCOPE FLAG IN THE FO HDI. THIS LASTED FOR JUST A FEW SECONDS, THEN RETURNED TO NORMAL. AS THE FLT PROGRESSED, THIS CONDITION REPEATED. I DETERMINED THE FO VERT GYROSCOPE FAILED. I CALLED DISPATCH AND DECIDED STL WX WAS UNSUITABLE WITH THE LOSS OF THE FO'S VERT GYROSCOPE. WITH DISPATCH CONCURRENCE, WE CHANGED OUR DEST TO IND WHICH WAS RPTED CLR. MAINT FIXED THE PROBLEM. THE CONTINUATION OF FLT X FROM IND TO STL WAS UNEVENTFUL.

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.