Navigation radio out of tolerance provides track error for air carrier large transport.

Attributes
ACN	131010
Time
Date	198912
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : chs
State Reference	SC
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : j79
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : private pilot : instrument pilot : flight engineer pilot : atp pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 12400
ASRS Report	131010
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 7000 flight time type : 180
ASRS Report	130866
Events
Anomaly	aircraft equipment problem : less severe inflight encounter : weather non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Flying over charleston, sc, at FL350, flying outbnd on 215 degree right chs (J79). About 30 mi south ATC asked our heading and arwy. We responded that we showed that we were on the arwy. ATC said we weren't. ATC gave us a heading to rejoin, and when ATC said we were on centerline our #1 navigation showed a 6-8 degree difference. From that point, radios were unreliable and continued flight with headings from ATC. Radios were written in log book as unreliable and repaired at our next stop.

Original NASA ASRS Text

Title: NAVIGATION RADIO OUT OF TOLERANCE PROVIDES TRACK ERROR FOR ACR LGT.

Narrative: FLYING OVER CHARLESTON, SC, AT FL350, FLYING OUTBND ON 215 DEG R CHS (J79). ABOUT 30 MI S ATC ASKED OUR HDG AND ARWY. WE RESPONDED THAT WE SHOWED THAT WE WERE ON THE ARWY. ATC SAID WE WEREN'T. ATC GAVE US A HDG TO REJOIN, AND WHEN ATC SAID WE WERE ON CENTERLINE OUR #1 NAV SHOWED A 6-8 DEG DIFFERENCE. FROM THAT POINT, RADIOS WERE UNRELIABLE AND CONTINUED FLT WITH HDGS FROM ATC. RADIOS WERE WRITTEN IN LOG BOOK AS UNRELIABLE AND REPAIRED AT OUR NEXT STOP.

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.