Hills east of runway 25 cause GPWS alarm resulting in pull-up.

Attributes
ACN	242546
Time
Date	199306
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : geg
State Reference	WA
Altitude	msl bound lower : 4100 msl bound upper : 4100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : geg
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
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 : 210 flight time total : 9000 flight time type : 3000
ASRS Report	242546
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : exited adverse environment
Consequence	Other
Supplementary
Primary Problem	Airport
Air Traffic Incident	other

Narrative:

On visual approach to runway 25 geg, got 'terrain, terrain' alert. Pulled up to silence alert. On 070 degree radial inbound geg at 7000 ft, within 10 mi, descended from 7000 ft to 4100 ft. At altitude capture got pull-up. Ground and runway in sight. Should have passed 1000 ft above tower at 3100 ft and passed about 1 mi north of towers at 4500 ft on final approach to runway 25. Very difficult to fly transport category aircraft on normal approach for straight in runway 25 get. Sea approach should advise aircraft being vectored for visual straight in runway 25 geg of high obstructions. Aircraft without proper charts could hit towers if unaware of these. The towers are only noted on ILS 21 chart. Callback conversation with reporter revealed the following information: they were cleared to 7000 ft on the geg 070 degree radial to report the field in sight. Upon sighting the airport they were cleared for a visual approach. At that time they turned south of the radial and descended to 4100 ft. Unable to find out why 4100 ft. The GPWS caused a mandatory pull-up even though they had the obstruction in sight. Runway 21 was closed.

Original NASA ASRS Text

Title: HILLS E OF RWY 25 CAUSE GPWS ALARM RESULTING IN PULL-UP.

Narrative: ON VISUAL APCH TO RWY 25 GEG, GOT 'TERRAIN, TERRAIN' ALERT. PULLED UP TO SILENCE ALERT. ON 070 DEG RADIAL INBOUND GEG AT 7000 FT, WITHIN 10 MI, DSNDED FROM 7000 FT TO 4100 FT. AT ALT CAPTURE GOT PULL-UP. GND AND RWY IN SIGHT. SHOULD HAVE PASSED 1000 FT ABOVE TWR AT 3100 FT AND PASSED ABOUT 1 MI N OF TWRS AT 4500 FT ON FINAL APCH TO RWY 25. VERY DIFFICULT TO FLY TRANSPORT CATEGORY ACFT ON NORMAL APCH FOR STRAIGHT IN RWY 25 GET. SEA APCH SHOULD ADVISE ACFT BEING VECTORED FOR VISUAL STRAIGHT IN RWY 25 GEG OF HIGH OBSTRUCTIONS. ACFT WITHOUT PROPER CHARTS COULD HIT TWRS IF UNAWARE OF THESE. THE TWRS ARE ONLY NOTED ON ILS 21 CHART. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THEY WERE CLRED TO 7000 FT ON THE GEG 070 DEG RADIAL TO RPT THE FIELD IN SIGHT. UPON SIGHTING THE ARPT THEY WERE CLRED FOR A VISUAL APCH. AT THAT TIME THEY TURNED S OF THE RADIAL AND DSNDED TO 4100 FT. UNABLE TO FIND OUT WHY 4100 FT. THE GPWS CAUSED A MANDATORY PULL-UP EVEN THOUGH THEY HAD THE OBSTRUCTION IN SIGHT. RWY 21 WAS CLOSED.

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.