<< >> NASA ASRS Report 200896, January 1992

Flight crew of medium large transport at published intercept altitude plus 100 ft on 33 ILS approach to bgr had GPWS -- climbed from 2300 to 2700 to clear the GPWS.

Attributes
ACN	200896
Time
Date	199201
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bgr
State Reference	ME
Altitude	msl bound lower : 2300 msl bound upper : 2700
Environment
Flight Conditions	IMC
Aircraft 1
Controlling Facilities	tracon : bgr
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 100 flight time total : 10000 flight time type : 800
ASRS Report	200896
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : commercial
Events
Anomaly	other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited adverse environment flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

On approach to bangor, mn, ILS runway 33, on the localizer, at 2300 ft MSL, assigned, 4 mi from totte OM, we received a GPWS warning 'terrain, terrain.' knowing GS intercept was 2200 ft we still started a climb to a higher altitude when warning ceased at 2700 ft. We reported incident to approach control and tower and although 2300 ft is an approved altitude they have had numerous reports from other aircraft. Suggest approach be flown at a higher altitude or at least warn flcs of possible GPWS warning! Callback conversation with reporter revealed the following information. While we were sitting at the gate waiting for departure another flight on approach at 2200 MSL had a GPWS. Appears that ours was not an isolated incident. Even if approach warned us we might get a GPWS it is hard to ignore and contrary to company policy not to comply with GPWS.

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Original NASA ASRS Text

Title: FLC OF MLG AT PUBLISHED INTERCEPT ALT PLUS 100 FT ON 33 ILS APCH TO BGR HAD GPWS -- CLBED FROM 2300 TO 2700 TO CLR THE GPWS.

Narrative: ON APCH TO BANGOR, MN, ILS RWY 33, ON THE LOC, AT 2300 FT MSL, ASSIGNED, 4 MI FROM TOTTE OM, WE RECEIVED A GPWS WARNING 'TERRAIN, TERRAIN.' KNOWING GS INTERCEPT WAS 2200 FT WE STILL STARTED A CLB TO A HIGHER ALT WHEN WARNING CEASED AT 2700 FT. WE RPTED INCIDENT TO APCH CTL AND TWR AND ALTHOUGH 2300 FT IS AN APPROVED ALT THEY HAVE HAD NUMEROUS RPTS FROM OTHER ACFT. SUGGEST APCH BE FLOWN AT A HIGHER ALT OR AT LEAST WARN FLCS OF POSSIBLE GPWS WARNING! CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. WHILE WE WERE SITTING AT THE GATE WAITING FOR DEP ANOTHER FLT ON APCH AT 2200 MSL HAD A GPWS. APPEARS THAT OURS WAS NOT AN ISOLATED INCIDENT. EVEN IF APCH WARNED US WE MIGHT GET A GPWS IT IS HARD TO IGNORE AND CONTRARY TO COMPANY POLICY NOT TO COMPLY WITH GPWS.

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.