<< >> NASA ASRS Report 456063, November 1999

A DHC8 on a missed approach procedure at 5000 ft had GPWS warning and executed an escape procedure causing an altitude excursion.

Attributes
ACN	456063
Time
Date	199911
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : eat.airport
State Reference	WA
Altitude	msl single value : 5000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zse.artcc
Operator	common carrier : air carrier
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	landing : missed approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 140 flight time total : 1550 flight time type : 500
ASRS Report	456063
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude
Independent Detector	aircraft equipment other aircraft equipment : gpws
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	other
Supplementary
Problem Areas	Weather Aircraft Chart Or Publication Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

After attempting the VOR-a approach to eat, wa, we followed the published missed approach procedure. Once established in the hold, the captain contacted dispatch for instructions and I called ATC to report turning outbound and that we were awaiting further instructions from company. At this time, we got a 'terrain, terrain, pull up' indication from the GPWS. I immediately set climb power and turned toward the airport. Out of 5600 ft MSL, the captain called ATC to inform them of the GPWS warning and that we were climbing, and asked for a delay vector. We were assigned heading 090 degrees and 6000 ft. Dispatch rereleased us to sea, and we were cleared wbound, direct eat V120 on course. En route to sea, the captain verified to me our position at the time of the terrain alert to be 3.5 mi north of eat VOR, and upon landing in seattle, wrote up the GPWS in the maintenance log for giving an erroneous warning. We had no other problems with the GPWS en route.

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Original NASA ASRS Text

Title: A DHC8 ON A MISSED APCH PROC AT 5000 FT HAD GPWS WARNING AND EXECUTED AN ESCAPE PROC CAUSING AN ALT EXCURSION.

Narrative: AFTER ATTEMPTING THE VOR-A APCH TO EAT, WA, WE FOLLOWED THE PUBLISHED MISSED APCH PROC. ONCE ESTABLISHED IN THE HOLD, THE CAPT CONTACTED DISPATCH FOR INSTRUCTIONS AND I CALLED ATC TO RPT TURNING OUTBOUND AND THAT WE WERE AWAITING FURTHER INSTRUCTIONS FROM COMPANY. AT THIS TIME, WE GOT A 'TERRAIN, TERRAIN, PULL UP' INDICATION FROM THE GPWS. I IMMEDIATELY SET CLB PWR AND TURNED TOWARD THE ARPT. OUT OF 5600 FT MSL, THE CAPT CALLED ATC TO INFORM THEM OF THE GPWS WARNING AND THAT WE WERE CLBING, AND ASKED FOR A DELAY VECTOR. WE WERE ASSIGNED HDG 090 DEGS AND 6000 FT. DISPATCH RERELEASED US TO SEA, AND WE WERE CLRED WBOUND, DIRECT EAT V120 ON COURSE. ENRTE TO SEA, THE CAPT VERIFIED TO ME OUR POS AT THE TIME OF THE TERRAIN ALERT TO BE 3.5 MI N OF EAT VOR, AND UPON LNDG IN SEATTLE, WROTE UP THE GPWS IN THE MAINT LOG FOR GIVING AN ERRONEOUS WARNING. WE HAD NO OTHER PROBS WITH THE GPWS ENRTE.

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.