While vectoring to final bgr runway 33 final approach course in IMC, SF34 executes GPWS maneuver.

Attributes
ACN	499726
Time
Date	200102
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bgr.airport
State Reference	ME
Altitude	msl single value : 4000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bgr.tracon
Operator	common carrier : air carrier
Make Model Name	SF 340B
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 33 other ndb
Flight Phase	descent : approach
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 8 controller non radar : 8 controller radar : 19
ASRS Report	499726
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	other spatial deviation
Independent Detector	aircraft equipment : gpws other flight crewa
Resolutory Action	controller : issued advisory flight crew : took evasive action flight crew : returned to original clearance flight crew : exited adverse environment
Consequence	faa : investigated
Supplementary
Problem Areas	Aircraft ATC Human Performance Airport
Primary Problem	Aircraft
Air Traffic Incident	Operational Error

Narrative:

An SF34 got a GPWS at 4000 ft descending. Aircraft climbed back up to 4000 ft, called a 'pan, pan, pan.' advised aircraft of valid altitude of 3000 ft and altimeter. We have had numerous GPWS's at bangor over the yrs. Aircraft was not in conflict with other aircraft, but potential was there due to holding pattern at totte is same area. Callback conversation with reporter revealed the following information: facility specialist advised that 'kings mountain' was the most likely GPWS alert factor. Kings mountain is located on base to final for runway 33, and has been a known GPWS problem for over 10 yrs. The specialist stated that most of the alerts are from collins installed equipment and programming. The condition becomes more prominent in the winter when the ground is frozen, and the pilot descends at a higher than normal rate, thus activating the alert.

Original NASA ASRS Text

Title: WHILE VECTORING TO FINAL BGR RWY 33 FINAL APCH COURSE IN IMC, SF34 EXECUTES GPWS MANEUVER.

Narrative: AN SF34 GOT A GPWS AT 4000 FT DSNDING. ACFT CLBED BACK UP TO 4000 FT, CALLED A 'PAN, PAN, PAN.' ADVISED ACFT OF VALID ALT OF 3000 FT AND ALTIMETER. WE HAVE HAD NUMEROUS GPWS'S AT BANGOR OVER THE YRS. ACFT WAS NOT IN CONFLICT WITH OTHER ACFT, BUT POTENTIAL WAS THERE DUE TO HOLDING PATTERN AT TOTTE IS SAME AREA. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: FACILITY SPECIALIST ADVISED THAT 'KINGS MOUNTAIN' WAS THE MOST LIKELY GPWS ALERT FACTOR. KINGS MOUNTAIN IS LOCATED ON BASE TO FINAL FOR RWY 33, AND HAS BEEN A KNOWN GPWS PROB FOR OVER 10 YRS. THE SPECIALIST STATED THAT MOST OF THE ALERTS ARE FROM COLLINS INSTALLED EQUIP AND PROGRAMMING. THE CONDITION BECOMES MORE PROMINENT IN THE WINTER WHEN THE GND IS FROZEN, AND THE PLT DSNDS AT A HIGHER THAN NORMAL RATE, THUS ACTIVATING THE ALERT.

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.