<< >> NASA ASRS Report 531760, November 2001

Fokker 100 first officer took evasive escape maneuver after the GPWS sounded, warning of approaching terrain. After receiving an all clear, and informing ATC of reason for their altitude excursion from assigned, they determined that it was a false alarm and wrote up the system for maintenance action.

Attributes
ACN	531760
Time
Date	200111
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	intersection : valry
State Reference	NY
Altitude	msl bound lower : 7000 msl bound upper : 10000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw.artcc tower : lns.tower
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 16 other
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 4900 flight time type : 700
ASRS Report	531760
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment : gpws other flight crewa
Resolutory Action	flight crew : exited adverse environment flight crew : took evasive action
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Approximately wnw of valry intersection at 7000 ft MSL, got a 'too low terrain' GPWS warning. We responded in accordance with the 'red box' procedures, and climbed to 10000 ft MSL where the warning stopped. Advised ZBW during the escape what we were doing. Leveled at 10000 ft MSL, then proceeded to ign VOR and let down for an ILS runway 16 approach/landing to hpn. It was IMC throughout warning and recovery. MSA in the area is 3000 ft MSL. Egpws was not on. Wrote the problem up in the logbook. Maintenance placarded the system inoperative.

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Original NASA ASRS Text

Title: FOKKER 100 FO TOOK EVASIVE ESCAPE MANEUVER AFTER THE GPWS SOUNDED, WARNING OF APCHING TERRAIN. AFTER RECEIVING AN ALL CLR, AND INFORMING ATC OF REASON FOR THEIR ALT EXCURSION FROM ASSIGNED, THEY DETERMINED THAT IT WAS A FALSE ALARM AND WROTE UP THE SYS FOR MAINT ACTION.

Narrative: APPROX WNW OF VALRY INTXN AT 7000 FT MSL, GOT A 'TOO LOW TERRAIN' GPWS WARNING. WE RESPONDED IN ACCORDANCE WITH THE 'RED BOX' PROCS, AND CLBED TO 10000 FT MSL WHERE THE WARNING STOPPED. ADVISED ZBW DURING THE ESCAPE WHAT WE WERE DOING. LEVELED AT 10000 FT MSL, THEN PROCEEDED TO IGN VOR AND LET DOWN FOR AN ILS RWY 16 APCH/LNDG TO HPN. IT WAS IMC THROUGHOUT WARNING AND RECOVERY. MSA IN THE AREA IS 3000 FT MSL. EGPWS WAS NOT ON. WROTE THE PROB UP IN THE LOGBOOK. MAINT PLACARDED THE SYS INOP.

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.