Flight crew of an embraer EMB120 questioned new altimeter setting due to the wide variation of old to the new one when starting an ILS approach and was subsequently given a corrected one after the ARTCC controller reverified for correct setting.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	459081
Time
Date	199912
Day	Fri
Local Time Of Day	1801 To 2400
Place
State Reference	CA
Altitude	msl single value : 5100
Environment
Flight Conditions	IMC
Aircraft 1
Controlling Facilities	artcc : zse.artcc
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 119
Navigation In Use	ils localizer & glide slope : 32
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar controller : approach
Qualification	controller : radar
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : altimeter setting other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Problem Areas	ATC Human Performance Weather
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure

Narrative:

Wrong altimeter entered into WX database. Actual altimeter was 30.09, database was 30.29. This situation was not caught by data specialist, but by controller and pilot. WX was enough of a factor to dictate ILS approachs, and if this same situation had happened 2 days earlier and not caught, WX was at minimums. Pilot was asked if newest WX was needed, and advised they already had it. Lower altitude and approach clearance were issued with altimeter 30.29 give. There was question in the pilot's voice inflection, which caused controller to more closely inspect and question altimeters. Further investigation showed that someone had a chance to catch and correct problem, but apparently failed to.

Original NASA ASRS Text

Title: FLC OF AN EMBRAER EMB120 QUESTIONED NEW ALTIMETER SETTING DUE TO THE WIDE VARIATION OF OLD TO THE NEW ONE WHEN STARTING AN ILS APCH AND WAS SUBSEQUENTLY GIVEN A CORRECTED ONE AFTER THE ARTCC CTLR REVERIFIED FOR CORRECT SETTING.

Narrative: WRONG ALTIMETER ENTERED INTO WX DATABASE. ACTUAL ALTIMETER WAS 30.09, DATABASE WAS 30.29. THIS SIT WAS NOT CAUGHT BY DATA SPECIALIST, BUT BY CTLR AND PLT. WX WAS ENOUGH OF A FACTOR TO DICTATE ILS APCHS, AND IF THIS SAME SIT HAD HAPPENED 2 DAYS EARLIER AND NOT CAUGHT, WX WAS AT MINIMUMS. PLT WAS ASKED IF NEWEST WX WAS NEEDED, AND ADVISED THEY ALREADY HAD IT. LOWER ALT AND APCH CLRNC WERE ISSUED WITH ALTIMETER 30.29 GIVE. THERE WAS QUESTION IN THE PLT'S VOICE INFLECTION, WHICH CAUSED CTLR TO MORE CLOSELY INSPECT AND QUESTION ALTIMETERS. FURTHER INVESTIGATION SHOWED THAT SOMEONE HAD A CHANCE TO CATCH AND CORRECT PROB, BUT APPARENTLY FAILED TO.

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.