Flight crew of a cpr C550 on an NDB approach had tower inform them they were north of course. At about the same time the needles swung 20 degrees left indicating north of course.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	422214
Time
Date	199812
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : osu airport : osu
State Reference	OH
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : osu
Operator	general aviation : corporate
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Navigation In Use	other ndb
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 7600 flight time type : 3000
ASRS Report	422214
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other
Situations
Navigational Aid	Unspecified

Narrative:

Cmh approach cleared us for the NDB runway 27L to osu. Both pilot and copilot ADF needles confirmed we were tracking the inbound approach course of 276 degrees until we were approximately 2.5 mi from the missed approach point. Both needles suddenly swung left about 20 degrees, indicating we were north of course. The osu tower then stated that we appeared to be about 1 mi north of course. We corrected our heading to reintercept the final approach course and landed without incident. The tower asked if we were receiving the NDB adequately as we were the second aircraft that morning to track inbound north of course. We responded that the morse code signal was continuously monitored. The tower suggested there was probably a problem with the approach and that they would research it. Callback conversation with reporter revealed the following information: reporter states that the approach seemed fine until they got in close and the needle swung. Controller contacted them once on the ground to get more information since this had happened to a previous flight as well. They have been into the airport since that time but used a different runway and different approach. The controller indicated they would follow up on the problem.

Original NASA ASRS Text

Title: FLC OF A CPR C550 ON AN NDB APCH HAD TWR INFORM THEM THEY WERE N OF COURSE. AT ABOUT THE SAME TIME THE NEEDLES SWUNG 20 DEGS L INDICATING N OF COURSE.

Narrative: CMH APCH CLRED US FOR THE NDB RWY 27L TO OSU. BOTH PLT AND COPLT ADF NEEDLES CONFIRMED WE WERE TRACKING THE INBOUND APCH COURSE OF 276 DEGS UNTIL WE WERE APPROX 2.5 MI FROM THE MISSED APCH POINT. BOTH NEEDLES SUDDENLY SWUNG L ABOUT 20 DEGS, INDICATING WE WERE N OF COURSE. THE OSU TWR THEN STATED THAT WE APPEARED TO BE ABOUT 1 MI N OF COURSE. WE CORRECTED OUR HDG TO REINTERCEPT THE FINAL APCH COURSE AND LANDED WITHOUT INCIDENT. THE TWR ASKED IF WE WERE RECEIVING THE NDB ADEQUATELY AS WE WERE THE SECOND ACFT THAT MORNING TO TRACK INBOUND N OF COURSE. WE RESPONDED THAT THE MORSE CODE SIGNAL WAS CONTINUOUSLY MONITORED. THE TWR SUGGESTED THERE WAS PROBABLY A PROB WITH THE APCH AND THAT THEY WOULD RESEARCH IT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT THE APCH SEEMED FINE UNTIL THEY GOT IN CLOSE AND THE NEEDLE SWUNG. CTLR CONTACTED THEM ONCE ON THE GND TO GET MORE INFO SINCE THIS HAD HAPPENED TO A PREVIOUS FLT AS WELL. THEY HAVE BEEN INTO THE ARPT SINCE THAT TIME BUT USED A DIFFERENT RWY AND DIFFERENT APCH. THE CTLR INDICATED THEY WOULD FOLLOW UP ON THE 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.