<< >> NASA ASRS Report 202795, February 1992

Evasive action missed approach executed as GPWS alerts crew to a potential gear problem during a low visibility approach at night.

Attributes
ACN	202795
Time
Date	199202
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : orf airport : ord
State Reference	VA
Altitude	agl bound lower : 400 agl bound upper : 400
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tower : orf
Operator	common carrier : air carrier
Make Model Name	Medium Transport
Flight Phase	descent : approach landing : missed approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 225 flight time total : 12200 flight time type : 4125
ASRS Report	202795
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On ILS approach to runway 05 at norfolk, va we received a GPWS warning for 'gear' at about 4000 ft AGL. The gear indicator panel showed '3 green' down and locked. We went missed approach. Returned for a second approach, confirmed '3 green' on gear indicator panel as we had before. Got another gear warning from GPWS at 400 ft AGL. Missed approach again. Went out on extended vectors, put the gear down, got '3 green' on gear position indicator and visually confirmed that gear was down and locked. (Mdt is high wing airplane, you can see mains from the cabin and flight deck has a sight glass for the nose gear). Returned to norfolk and made a normal approach and landing. I don't know if you are tracking false GPWS warnings, but if you have any statistics, I would like to see them. This system has given me enough false indications over the last 5 yrs, that I am suspect of its value to me or the flight deck.

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Original NASA ASRS Text

Title: EVASIVE ACTION MISSED APCH EXECUTED AS GPWS ALERTS CREW TO A POTENTIAL GEAR PROBLEM DURING A LOW VIS APCH AT NIGHT.

Narrative: ON ILS APCH TO RWY 05 AT NORFOLK, VA WE RECEIVED A GPWS WARNING FOR 'GEAR' AT ABOUT 4000 FT AGL. THE GEAR INDICATOR PANEL SHOWED '3 GREEN' DOWN AND LOCKED. WE WENT MISSED APCH. RETURNED FOR A SECOND APCH, CONFIRMED '3 GREEN' ON GEAR INDICATOR PANEL AS WE HAD BEFORE. GOT ANOTHER GEAR WARNING FROM GPWS AT 400 FT AGL. MISSED APCH AGAIN. WENT OUT ON EXTENDED VECTORS, PUT THE GEAR DOWN, GOT '3 GREEN' ON GEAR POS INDICATOR AND VISUALLY CONFIRMED THAT GEAR WAS DOWN AND LOCKED. (MDT IS HIGH WING AIRPLANE, YOU CAN SEE MAINS FROM THE CABIN AND FLT DECK HAS A SIGHT GLASS FOR THE NOSE GEAR). RETURNED TO NORFOLK AND MADE A NORMAL APCH AND LNDG. I DON'T KNOW IF YOU ARE TRACKING FALSE GPWS WARNINGS, BUT IF YOU HAVE ANY STATISTICS, I WOULD LIKE TO SEE THEM. THIS SYS HAS GIVEN ME ENOUGH FALSE INDICATIONS OVER THE LAST 5 YRS, THAT I AM SUSPECT OF ITS VALUE TO ME OR THE FLT DECK.

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.