MD11 crew had a false capture of the localizer on runway 7R at vhhh.

Attributes
ACN	544696
Time
Date	200204
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : vhhh.airport
State Reference	FO
Altitude	msl single value : 1700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : vhhh.tracon
Operator	common carrier : air carrier
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 07r other
Flight Phase	descent : approach
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : flight engineer pilot : multi engine pilot : cfi pilot : atp pilot : instrument
Experience	flight time last 90 days : 50 flight time total : 6500 flight time type : 400
ASRS Report	544696
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure other anomaly other anomaly other other spatial deviation
Independent Detector	other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : issued alert flight crew : overrode automation flight crew : regained aircraft control flight crew : returned to intended or assigned course none taken : detected after the fact other
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Navigational Facility
Primary Problem	Navigational Facility
Air Traffic Incident	Pilot Deviation
Situations
Navigational Aid	ISR.ILS

Narrative:

The aircraft was configured with flaps 28 degrees, gear up, slowing to 160 KTS and level at 1700 ft MSL with autoplt engaged on approach to the hong kong international runway 7R. We were given a heading of 040 degrees to intercept the localizer, cleared ILS runway 7R approach vhhh. I, first officer, armed approach/land. Captain (PNF) called out 'localizer alive' and 'localizer capture' as the aircraft began a turn towards the 073 degrees inbound course. Suddenly the aircraft turned left away from the localizer and towards the approach corridor of parallel runway 7L, an active runway. I disconnected the autoplt and turned back toward course. ATC said we'd gone through the localizer and to turn back right to a heading of 110 degrees to re-intercept the localizer. They then asked if we were established. We replied yes. I hand flew the approach. The flight director was divergent with the ILS so we used raw data. No traffic was noted on approach to parallel runway 7L. No faults were noted. Perhaps an errant ground signal caused aircraft to deviate. Rapid reaction from PF kept aircraft from straying far from course. A flight safety report was also filed with the company.

Original NASA ASRS Text

Title: MD11 CREW HAD A FALSE CAPTURE OF THE LOC ON RWY 7R AT VHHH.

Narrative: THE ACFT WAS CONFIGURED WITH FLAPS 28 DEGS, GEAR UP, SLOWING TO 160 KTS AND LEVEL AT 1700 FT MSL WITH AUTOPLT ENGAGED ON APCH TO THE HONG KONG INTL RWY 7R. WE WERE GIVEN A HEADING OF 040 DEGS TO INTERCEPT THE LOC, CLRED ILS RWY 7R APCH VHHH. I, FO, ARMED APCH/LAND. CAPT (PNF) CALLED OUT 'LOC ALIVE' AND 'LOC CAPTURE' AS THE ACFT BEGAN A TURN TOWARDS THE 073 DEGS INBOUND COURSE. SUDDENLY THE ACFT TURNED L AWAY FROM THE LOC AND TOWARDS THE APCH CORRIDOR OF PARALLEL RWY 7L, AN ACTIVE RWY. I DISCONNECTED THE AUTOPLT AND TURNED BACK TOWARD COURSE. ATC SAID WE'D GONE THROUGH THE LOC AND TO TURN BACK R TO A HEADING OF 110 DEGS TO RE-INTERCEPT THE LOC. THEY THEN ASKED IF WE WERE ESTABLISHED. WE REPLIED YES. I HAND FLEW THE APCH. THE FLT DIRECTOR WAS DIVERGENT WITH THE ILS SO WE USED RAW DATA. NO TFC WAS NOTED ON APCH TO PARALLEL RWY 7L. NO FAULTS WERE NOTED. PERHAPS AN ERRANT GND SIGNAL CAUSED ACFT TO DEVIATE. RAPID REACTION FROM PF KEPT ACFT FROM STRAYING FAR FROM COURSE. A FLT SAFETY RPT WAS ALSO FILED WITH THE COMPANY.

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.