Flight crew of large transport reporting northeast sector of orf VOR erratic signal.

Attributes
ACN	188431
Time
Date	199109
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : orf
State Reference	VA
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc artcc : mteg
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : zdc
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 210 flight time total : 30000 flight time type : 6000
ASRS Report	188431
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Events
Anomaly	other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : became reoriented
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other
Situations
ATC Facility	other physical facility

Narrative:

Northeast sector of orf VOR was unreliable for navigation on both cockpit RMI's and both cockpit HSI's. Both 'off flags' appeared intermittently. This condition existed between 150 and 30 DME tracking inbound in the northeast sector. ATC indicated VOR was normal. Another carrier reported same problem.

Original NASA ASRS Text

Title: FLC OF LGT RPTING NE SECTOR OF ORF VOR ERRATIC SIGNAL.

Narrative: NE SECTOR OF ORF VOR WAS UNRELIABLE FOR NAV ON BOTH COCKPIT RMI'S AND BOTH COCKPIT HSI'S. BOTH 'OFF FLAGS' APPEARED INTERMITTENTLY. THIS CONDITION EXISTED BTWN 150 AND 30 DME TRACKING INBOUND IN THE NE SECTOR. ATC INDICATED VOR WAS NORMAL. ANOTHER CARRIER RPTED SAME PROBLEM.

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.