The captain of a DC9 reports that the flight crew received GPWS GS and terrain warnings while on the ILS approach into isp. There was no potential conflict with terrain so the first officer continued the approach to landing.

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Attributes
ACN	331200
Time
Date	199603
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : isp
State Reference	NH
Altitude	agl bound lower : 0 agl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : isp
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 8910 flight time type : 1500
ASRS Report	331200
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : anomaly accepted other
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other

Narrative:

Cleared for visual approach. When we first tuned up the localizer for backup, it was not on. It came up while we were on final. We were aligned with runway and on VASI, but got GS warning followed by terrain warning. As we could see that there was no conflict with terrain we continued and landed without incident. The first officer, flying, was a little fast and therefore may have dipped below 1000 FPM descent rate for a second -- either that or spurious GS signal must have caused the warning.

Original NASA ASRS Text

Title: THE CAPT OF A DC9 RPTS THAT THE FLC RECEIVED GPWS GS AND TERRAIN WARNINGS WHILE ON THE ILS APCH INTO ISP. THERE WAS NO POTENTIAL CONFLICT WITH TERRAIN SO THE FO CONTINUED THE APCH TO LNDG.

Narrative: CLRED FOR VISUAL APCH. WHEN WE FIRST TUNED UP THE LOC FOR BACKUP, IT WAS NOT ON. IT CAME UP WHILE WE WERE ON FINAL. WE WERE ALIGNED WITH RWY AND ON VASI, BUT GOT GS WARNING FOLLOWED BY TERRAIN WARNING. AS WE COULD SEE THAT THERE WAS NO CONFLICT WITH TERRAIN WE CONTINUED AND LANDED WITHOUT INCIDENT. THE FO, FLYING, WAS A LITTLE FAST AND THEREFORE MAY HAVE DIPPED BELOW 1000 FPM DSCNT RATE FOR A SECOND -- EITHER THAT OR SPURIOUS GS SIGNAL MUST HAVE CAUSED THE WARNING.

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.