Small transport pilot had altitude excursion on approach at rdm.

Attributes
ACN	513633
Time
Date	200106
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zse.artcc
State Reference	WA
Altitude	msl single value : 7000
Environment
Flight Conditions	IMC
Weather Elements	Rain
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zse.artcc
Operator	common carrier : air taxi
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Operating Under FAR Part	Part 135
Navigation In Use	ils localizer & glide slope : 22
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 90 flight time total : 3300 flight time type : 60
ASRS Report	513633
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : clearance other anomaly other other spatial deviation
Independent Detector	atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : issued alert controller : issued new clearance flight crew : returned to assigned altitude other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

From approximately 14 mi north of dsd VOR, cleared by ZSE 'direct bodey, maintain 7000 ft till established, cleared ILS runway 22 at redmond.' I proceeded toward bodey OM at 7000 ft, ADF indicated station passage and ILS runway 22 localizer was 'off the peg.' started turn outbound and began descent to 6500 ft as indicated on the redmond, or, ILS runway 22 approach profile. ZSE then queried me as to position, then corrected me by saying I was still 6 mi north of bodey. At that point I was at approximately 6700 ft. ZSE instructed me to climb to 7700 ft (MVA) and provided vectors for the straight in on ILS runway 22. No other incident. I suspect the following: ADF was wrong in indicating station passage 6 mi north. (Precipitation static?) localizer 'off peg' was probably a false localizer side lobe signal.

Original NASA ASRS Text

Title: SMT PLT HAD ALT EXCURSION ON APCH AT RDM.

Narrative: FROM APPROX 14 MI N OF DSD VOR, CLRED BY ZSE 'DIRECT BODEY, MAINTAIN 7000 FT TILL ESTABLISHED, CLRED ILS RWY 22 AT REDMOND.' I PROCEEDED TOWARD BODEY OM AT 7000 FT, ADF INDICATED STATION PASSAGE AND ILS RWY 22 LOC WAS 'OFF THE PEG.' STARTED TURN OUTBOUND AND BEGAN DSCNT TO 6500 FT AS INDICATED ON THE REDMOND, OR, ILS RWY 22 APCH PROFILE. ZSE THEN QUERIED ME AS TO POS, THEN CORRECTED ME BY SAYING I WAS STILL 6 MI N OF BODEY. AT THAT POINT I WAS AT APPROX 6700 FT. ZSE INSTRUCTED ME TO CLB TO 7700 FT (MVA) AND PROVIDED VECTORS FOR THE STRAIGHT IN ON ILS RWY 22. NO OTHER INCIDENT. I SUSPECT THE FOLLOWING: ADF WAS WRONG IN INDICATING STATION PASSAGE 6 MI N. (PRECIPITATION STATIC?) LOC 'OFF PEG' WAS PROBABLY A FALSE LOC SIDE LOBE SIGNAL.

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.