Erratic ILS indications caused by aircraft taxi rtes.

Attributes
ACN	293579
Time
Date	199501
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : jfk
State Reference	NY
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tower : jfk
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : jfk Other
Flight Phase	descent : approach landing other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar controller : non radar
Experience	controller non radar : 12 controller radar : 6
ASRS Report	293579
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other

Narrative:

When landing runway 4L and runway 4R all runway 4R arrs must cross runway 4L to get to the terminals. While on final for runway 4L an aircraft was crossing from runway 4R to terminal causing a wild swing in the localizer signal. If the aircraft on final had not heard the controller clear the other aircraft to cross the runway and 'followed' the localizer signal to the right it would have put him in confliction with the aircraft on final for runway 4R.

Original NASA ASRS Text

Title: ERRATIC ILS INDICATIONS CAUSED BY ACFT TAXI RTES.

Narrative: WHEN LNDG RWY 4L AND RWY 4R ALL RWY 4R ARRS MUST CROSS RWY 4L TO GET TO THE TERMINALS. WHILE ON FINAL FOR RWY 4L AN ACFT WAS XING FROM RWY 4R TO TERMINAL CAUSING A WILD SWING IN THE LOC SIGNAL. IF THE ACFT ON FINAL HAD NOT HEARD THE CTLR CLR THE OTHER ACFT TO CROSS THE RWY AND 'FOLLOWED' THE LOC SIGNAL TO THE R IT WOULD HAVE PUT HIM IN CONFLICTION WITH THE ACFT ON FINAL FOR RWY 4R.

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.