<< >> NASA ASRS Report 399700, April 1998

On localizer approach descends below published altitude prior to reaching an intersection. They are 1300 ft low.

Attributes
ACN	399700
Time
Date	199804
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : msy
State Reference	LA
Altitude	msl bound lower : 700 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : msy
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	arrival : profile descent arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 15000 flight time type : 750
ASRS Report	399700
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On msy localizer runway 19 approach, descended to 700 ft MSL before jaspo inbound. Was not using VNAV. Did not have 2000 ft in altitude window. Had 700 ft in window before 2000 ft leveloff and aircraft descended to 700 ft. Solution: do not change altitude window until aircraft has captured the correct altitude. We were too far ahead of the aircraft.

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Original NASA ASRS Text

Title: ON LOC APCH DSNDS BELOW PUBLISHED ALT PRIOR TO REACHING AN INTXN. THEY ARE 1300 FT LOW.

Narrative: ON MSY LOC RWY 19 APCH, DSNDED TO 700 FT MSL BEFORE JASPO INBOUND. WAS NOT USING VNAV. DID NOT HAVE 2000 FT IN ALT WINDOW. HAD 700 FT IN WINDOW BEFORE 2000 FT LEVELOFF AND ACFT DSNDED TO 700 FT. SOLUTION: DO NOT CHANGE ALT WINDOW UNTIL ACFT HAS CAPTURED THE CORRECT ALT. WE WERE TOO FAR AHEAD OF THE ACFT.

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.