Track deviation. - NASA ASRS

Attributes
ACN	295220
Time
Date	199501
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mrb airport : iad
State Reference	WV
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Jetstream 32
Operating Under FAR Part	Part 135
Flight Phase	cruise other
Route In Use	enroute : on vectors enroute airway : bwi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 240 flight time total : 8000 flight time type : 4900
ASRS Report	295220
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
Resolutory Action	aircraft : equipment problem dissipated controller : issued new clearance other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After departing iad, dulles departure handed us off to bwi approach. Bwi assigned us a heading of 040 degrees to intercept v- 244 west of wooley intersection. Captain's VOR was set to the 101 degree radial off martinsburg VOR. First officer's VOR was set to the 308 degree radial off the bwi VOR. The captain's CDI centered on the 101 degree radial off mrb and the aircraft was turned to join the airway. Soon after turning, bwi called and gave us a heading of 050 degrees to join V-214. Approach advised us we were about 10 mi south of the airway. The aircraft was turned to a heading of 050 degrees. The captain's CDI indicated we were on the mrb 101 degree radial and then it indicated we had flown north of the course. The CDI then gave an indication that we were south of the airway as bwi approach said we were. Navigation frequencys were checked and doublechked. Mrb 112.1 was in the captain's navigation and 115.1 was in the first officer's navigation. Both navaids had been properly tuned and idented. The VOR accuracy check had not been performed yet. Both vors coincided prior to this problem. Both coincided after this problem.

Original NASA ASRS Text

Title: TRACK DEV.

Narrative: AFTER DEPARTING IAD, DULLES DEP HANDED US OFF TO BWI APCH. BWI ASSIGNED US A HDG OF 040 DEGS TO INTERCEPT V- 244 W OF WOOLEY INTXN. CAPT'S VOR WAS SET TO THE 101 DEG RADIAL OFF MARTINSBURG VOR. FO'S VOR WAS SET TO THE 308 DEG RADIAL OFF THE BWI VOR. THE CAPT'S CDI CTRED ON THE 101 DEG RADIAL OFF MRB AND THE ACFT WAS TURNED TO JOIN THE AIRWAY. SOON AFTER TURNING, BWI CALLED AND GAVE US A HDG OF 050 DEGS TO JOIN V-214. APCH ADVISED US WE WERE ABOUT 10 MI S OF THE AIRWAY. THE ACFT WAS TURNED TO A HDG OF 050 DEGS. THE CAPT'S CDI INDICATED WE WERE ON THE MRB 101 DEG RADIAL AND THEN IT INDICATED WE HAD FLOWN N OF THE COURSE. THE CDI THEN GAVE AN INDICATION THAT WE WERE S OF THE AIRWAY AS BWI APCH SAID WE WERE. NAV FREQS WERE CHKED AND DOUBLECHKED. MRB 112.1 WAS IN THE CAPT'S NAV AND 115.1 WAS IN THE FO'S NAV. BOTH NAVAIDS HAD BEEN PROPERLY TUNED AND IDENTED. THE VOR ACCURACY CHK HAD NOT BEEN PERFORMED YET. BOTH VORS COINCIDED PRIOR TO THIS PROB. BOTH COINCIDED AFTER THIS PROB.

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.