Flight crew of BA4101 has first officer GS fail on visual approach. It is deferred by maintenance after write-up and they fly one more trip before realizing that the GS is not deferrable.

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Attributes
ACN	409023
Time
Date	199807
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Jetstream 41
Navigation In Use	Other
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : instrument
Experience	flight time last 90 days : 400 flight time total : 3300 flight time type : 1200
ASRS Report	409023
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

First officer's GS failed during a visual approach into stl. We wrote it up and our maintenance department deferred the GS. After doing one more out and back (round-trip), we realized that the GS is not deferrable and they used an inappropriate deferral. We had flown the aircraft since writing it up and getting the incorrect deferral. This was an oversight on our behalf. Callback conversation with reporter revealed the following information: reporter states that the error was found by the captain of the next crew who took the aircraft. It was a problem of wrong item numbers for the deferral. Maintenance had written it up under the ground proximity number which referenced GS. The flying captain had glanced at that number and saw GS referenced but did not notice it was under ground proximity instead of navigation. Under the correct number for navigation equipment it indicates two installed, two required. The aircraft has an MEL book aboard for ready reference.

Original NASA ASRS Text

Title: FLC OF BA4101 HAS FO GS FAIL ON VISUAL APCH. IT IS DEFERRED BY MAINT AFTER WRITE-UP AND THEY FLY ONE MORE TRIP BEFORE REALIZING THAT THE GS IS NOT DEFERRABLE.

Narrative: FO'S GS FAILED DURING A VISUAL APCH INTO STL. WE WROTE IT UP AND OUR MAINT DEPT DEFERRED THE GS. AFTER DOING ONE MORE OUT AND BACK (ROUND-TRIP), WE REALIZED THAT THE GS IS NOT DEFERRABLE AND THEY USED AN INAPPROPRIATE DEFERRAL. WE HAD FLOWN THE ACFT SINCE WRITING IT UP AND GETTING THE INCORRECT DEFERRAL. THIS WAS AN OVERSIGHT ON OUR BEHALF. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT THE ERROR WAS FOUND BY THE CAPT OF THE NEXT CREW WHO TOOK THE ACFT. IT WAS A PROB OF WRONG ITEM NUMBERS FOR THE DEFERRAL. MAINT HAD WRITTEN IT UP UNDER THE GND PROX NUMBER WHICH REFED GS. THE FLYING CAPT HAD GLANCED AT THAT NUMBER AND SAW GS REFED BUT DID NOT NOTICE IT WAS UNDER GND PROX INSTEAD OF NAV. UNDER THE CORRECT NUMBER FOR NAV EQUIP IT INDICATES TWO INSTALLED, TWO REQUIRED. THE ACFT HAS AN MEL BOOK ABOARD FOR READY REF.

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.