<< >> NASA ASRS Report 535383, January 2002

B737-300 crew had an egpws 'terrain, terrain' warning at 4500 ft while being vectored for the runway 21 ILS at geg.

Attributes
ACN	535383
Time
Date	200201
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : geg.airport
State Reference	WA
Altitude	msl bound lower : 4300 msl bound upper : 4500
Environment
Flight Conditions	IMC
Aircraft 1
Controlling Facilities	tower : geg.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 21
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	535383
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	other anomaly other
Independent Detector	aircraft equipment : gpws other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance none taken : detected after the fact other
Consequence	other
Supplementary
Problem Areas	Aircraft FAA
Primary Problem	FAA

Narrative:

While being vectored for the geg ILS runway 21, we were at 4500 ft approximately .4 NM northeast of phort, heading 295 degrees. Approach control gave us a descent to 4000 ft MSL then a heading of 230 degrees with clearance to intercept the localizer at 4000 ft, cleared the ILS 21. Passing 4300 ft, the egpws gave a 'terrain, terrain' warning, followed shortly by 'pull up, pull up.' we executed the escape maneuver and climbed back to 4500 ft MSL before the warnings ceased. Approach later said that terrain in that location was 2700 ft MSL, but posed no terrain hazard. We had used level change to descend from 4500 ft.

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Original NASA ASRS Text

Title: B737-300 CREW HAD AN EGPWS 'TERRAIN, TERRAIN' WARNING AT 4500 FT WHILE BEING VECTORED FOR THE RWY 21 ILS AT GEG.

Narrative: WHILE BEING VECTORED FOR THE GEG ILS RWY 21, WE WERE AT 4500 FT APPROX .4 NM NE OF PHORT, HDG 295 DEGS. APCH CTL GAVE US A DSCNT TO 4000 FT MSL THEN A HDG OF 230 DEGS WITH CLRNC TO INTERCEPT THE LOC AT 4000 FT, CLRED THE ILS 21. PASSING 4300 FT, THE EGPWS GAVE A 'TERRAIN, TERRAIN' WARNING, FOLLOWED SHORTLY BY 'PULL UP, PULL UP.' WE EXECUTED THE ESCAPE MANEUVER AND CLBED BACK TO 4500 FT MSL BEFORE THE WARNINGS CEASED. APCH LATER SAID THAT TERRAIN IN THAT LOCATION WAS 2700 FT MSL, BUT POSED NO TERRAIN HAZARD. WE HAD USED LEVEL CHANGE TO DSND FROM 4500 FT.

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.