Non adherence to ATC procedure during IAP NDB approach.

Attributes
ACN	220374
Time
Date	199208
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iso
State Reference	NC
Altitude	msl bound lower : 1900 msl bound upper : 2100
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : iso tower : iso
Operator	common carrier : air taxi
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Flight Phase	descent : approach
Route In Use	approach : straight in enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 2000 flight time type : 300
ASRS Report	220374
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance non adherence : published procedure other anomaly other other spatial deviation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On a deadhead (fry) leg returning to home base I had received the final assigned heading to intercept the final approach for a straight-in NDB approach. Upon turning final the controller told me to switch to tower frequency. At that moment the ADF needle quickly began to fall and I reported my position to the tower as being over the final approach fix. The tower then cleared me to land and I started my descent to MDA. I had descended 200 ft when I noticed my ADF needle was now pointing toward the nose of the airplane. I immediately leveled off and the tower advised me to contact seymour johnson approach. The approach controller advised me I was left of course and that the min altitude was 2100 ft. He gave me a heading to reestablish me on final. I climbed from 1900 to 2100 and was switched back to tower control. This time I had true station passage and started my descent to MDA and completed the approach with no further problems. Contributing factors: ILS OTS. VOR and DME were OTS. Static (WX-induced) interference on ADF needle. Many thanks to the heads-up effort of seymour johnson controllers. Nice to know they keep an eye on those in the sky.

Original NASA ASRS Text

Title: NON ADHERENCE TO ATC PROC DURING IAP NDB APCH.

Narrative: ON A DEADHEAD (FRY) LEG RETURNING TO HOME BASE I HAD RECEIVED THE FINAL ASSIGNED HDG TO INTERCEPT THE FINAL APCH FOR A STRAIGHT-IN NDB APCH. UPON TURNING FINAL THE CTLR TOLD ME TO SWITCH TO TWR FREQ. AT THAT MOMENT THE ADF NEEDLE QUICKLY BEGAN TO FALL AND I RPTED MY POS TO THE TWR AS BEING OVER THE FINAL APCH FIX. THE TWR THEN CLRED ME TO LAND AND I STARTED MY DSCNT TO MDA. I HAD DSNDED 200 FT WHEN I NOTICED MY ADF NEEDLE WAS NOW POINTING TOWARD THE NOSE OF THE AIRPLANE. I IMMEDIATELY LEVELED OFF AND THE TWR ADVISED ME TO CONTACT SEYMOUR JOHNSON APCH. THE APCH CTLR ADVISED ME I WAS L OF COURSE AND THAT THE MIN ALT WAS 2100 FT. HE GAVE ME A HDG TO REESTABLISH ME ON FINAL. I CLBED FROM 1900 TO 2100 AND WAS SWITCHED BACK TO TWR CTL. THIS TIME I HAD TRUE STATION PASSAGE AND STARTED MY DSCNT TO MDA AND COMPLETED THE APCH WITH NO FURTHER PROBLEMS. CONTRIBUTING FACTORS: ILS OTS. VOR AND DME WERE OTS. STATIC (WX-INDUCED) INTERFERENCE ON ADF NEEDLE. MANY THANKS TO THE HEADS-UP EFFORT OF SEYMOUR JOHNSON CTLRS. NICE TO KNOW THEY KEEP AN EYE ON THOSE IN THE SKY.

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.