Dual HSI problems discovered on medium large transport during cruise.

Attributes
ACN	88477
Time
Date	198806
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : sqa
State Reference	AK
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dca
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : j501
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 140 flight time total : 6500 flight time type : 3300
ASRS Report	88477
Person 2
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After continuous checks with anc center during flight following with radar. Aircraft was found to have faulty HSI's on both captain and first officer sides. Numerous write ups had been made and components changed. Pilot input forms have been sent to chief pilots office. Colocated NDB at sparrevohn was out of service.

Original NASA ASRS Text

Title: DUAL HSI PROBLEMS DISCOVERED ON MLG DURING CRUISE.

Narrative: AFTER CONTINUOUS CHECKS WITH ANC CENTER DURING FLT FOLLOWING WITH RADAR. ACFT WAS FOUND TO HAVE FAULTY HSI'S ON BOTH CAPT AND F/O SIDES. NUMEROUS WRITE UPS HAD BEEN MADE AND COMPONENTS CHANGED. PLT INPUT FORMS HAVE BEEN SENT TO CHIEF PLTS OFFICE. COLOCATED NDB AT SPARREVOHN WAS OUT OF SERVICE.

Data retrieved from NASA's ASRS site as of August 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.