Light transport on practice ILS approach to lgb descends below assigned altitude and has near midair collision with an small aircraft that was cutting through the approach course.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	179574
Time
Date	199105
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lgb
State Reference	CA
Altitude	msl bound lower : 1150 msl bound upper : 1600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lgb tower : okc
Operator	general aviation : corporate
Make Model Name	Light Transport
Navigation In Use	Other Other
Flight Phase	descent : approach landing : go around
Aircraft 2
Make Model Name	Small Aircraft
Flight Phase	cruise other
Person 1
Affiliation	Other
Function	flight crew : first officer instruction : instructor oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 150 flight time total : 17500 flight time type : 600
ASRS Report	179574
Person 2
Affiliation	Other
Function	flight crew : captain instruction : trainee
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : crossing restriction not met conflict : nmac other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 0 vertical : 150
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was the training captain, giving instruction from the right seat, shooting an ILS runway 30 lgb. The PF started descending prior to the OM. We crossed the OM 400' (approximately) low. At the same time, the tower called traffic 2 O'clock, 1 mi, westbound. I replied negative contact. About 15 seconds later the tower issued us a low altitude alert and requested an immediate climb. We complied, and as the small transport passed approximately 150' below us, the captain reported it looked awfully close. The PF began a descent too soon because of a misinterp of a new EFIS presentation.

Original NASA ASRS Text

Title: LTT ON PRACTICE ILS APCH TO LGB DESCENDS BELOW ASSIGNED ALT AND HAS NMAC WITH AN SMA THAT WAS CUTTING THROUGH THE APCH COURSE.

Narrative: I WAS THE TRNING CAPT, GIVING INSTRUCTION FROM THE RIGHT SEAT, SHOOTING AN ILS RWY 30 LGB. THE PF STARTED DSNDING PRIOR TO THE OM. WE CROSSED THE OM 400' (APPROX) LOW. AT THE SAME TIME, THE TWR CALLED TFC 2 O'CLOCK, 1 MI, WBND. I REPLIED NEGATIVE CONTACT. ABOUT 15 SECS LATER THE TWR ISSUED US A LOW ALT ALERT AND REQUESTED AN IMMEDIATE CLB. WE COMPLIED, AND AS THE SMT PASSED APPROX 150' BELOW US, THE CAPT RPTED IT LOOKED AWFULLY CLOSE. THE PF BEGAN A DSNT TOO SOON BECAUSE OF A MISINTERP OF A NEW EFIS PRESENTATION.

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.