<< >> NASA ASRS Report 539204, February 2002

Regional jet 200 flight crew made a missed approach after their GS indication had them climb at 1000 ft above the intercept altitude approaching the FAF.

Attributes
ACN	539204
Time
Date	200202
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : buf.airport
State Reference	NY
Altitude	msl bound lower : 2500 msl bound upper : 3500
Environment
Flight Conditions	IMC
Weather Elements	Snow
Aircraft 1
Controlling Facilities	tracon : buf.tracon
Operator	common carrier : air carrier
Make Model Name	Regional Jet 200 ER&LR
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 23 other
Flight Phase	descent : approach landing : missed approach
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial
Experience	flight time last 90 days : 210 flight time total : 2400 flight time type : 1100
ASRS Report	539204
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : glide slope indicator other flight crewa other flight crewb
Resolutory Action	flight crew : became reoriented flight crew : executed missed approach flight crew : overrode automation flight crew : regained aircraft control
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

We were on vectors at 2500 ft for the ILS runway 23 approach into buffalo and were cleared for the approach. The flight director was armed for the approach and the autoplt was on. The flight director captured the localizer, but the GS indicated that we were high, which did not make sense. We were still 5 mi from the FAF. The GS indicator then began to approach our altitude, as if we were descending towards the localizer. As we continued, the flight director captured the GS and then commanded a climb. We were soon climbing at 2500 FPM. We disconnected the autoplt and executed the missed approach. The plane climbed to 3500 ft, 1000 ft above our intercept altitude. We returned for a second approach, which was normal. We believe that the spurious GS signal may have been caused by ground equipment or the airplane on the same approach in front of us.

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Original NASA ASRS Text

Title: REGIONAL JET 200 FLC MADE A MISSED APCH AFTER THEIR GS INDICATION HAD THEM CLB AT 1000 FT ABOVE THE INTERCEPT ALT APCHING THE FAF.

Narrative: WE WERE ON VECTORS AT 2500 FT FOR THE ILS RWY 23 APCH INTO BUFFALO AND WERE CLRED FOR THE APCH. THE FLT DIRECTOR WAS ARMED FOR THE APCH AND THE AUTOPLT WAS ON. THE FLT DIRECTOR CAPTURED THE LOC, BUT THE GS INDICATED THAT WE WERE HIGH, WHICH DID NOT MAKE SENSE. WE WERE STILL 5 MI FROM THE FAF. THE GS INDICATOR THEN BEGAN TO APCH OUR ALT, AS IF WE WERE DSNDING TOWARDS THE LOC. AS WE CONTINUED, THE FLT DIRECTOR CAPTURED THE GS AND THEN COMMANDED A CLB. WE WERE SOON CLBING AT 2500 FPM. WE DISCONNECTED THE AUTOPLT AND EXECUTED THE MISSED APCH. THE PLANE CLBED TO 3500 FT, 1000 FT ABOVE OUR INTERCEPT ALT. WE RETURNED FOR A SECOND APCH, WHICH WAS NORMAL. WE BELIEVE THAT THE SPURIOUS GS SIGNAL MAY HAVE BEEN CAUSED BY GND EQUIP OR THE AIRPLANE ON THE SAME APCH IN FRONT OF US.

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.