B757 aircraft on approach descended below restr crossing altitude while following ILS GS.

Attributes
ACN	376325
Time
Date	199708
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 7500 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax tower : mke
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 300 flight time total : 12000 flight time type : 1000
ASRS Report	376325
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 6500 flight time type : 50
ASRS Report	375928
Events
Anomaly	altitude deviation : overshoot altitude deviation : crossing restriction not met non adherence : published procedure non adherence : clearance
Independent Detector	other controllera 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 approach to runway 25R lax while transitioning from the mudde arrival, bonez to flung requires non precision approach altitude xings before coupling the aircraft to the ILS. Apparently while following the GS instead of adhering to the altitudes exactly, I went below the altitude of 8000 ft required at squirt. The workload on final tempts one to fly the GS or at least somewhat above it, and I accepted what I thought was 'only' 100-200 ft low instead of being exact. For one, I shall be more exacting and less tempted towards 'close enough for government work....' I do recommend, however, that the crossing altitude at squirt be lowered to a GS equivalent altitude and the area requiring the 8000 ft altitude be lowered also. From my understanding, this crossing restr is 'busted' quite often -- certainly not on purpose, and approach control keeps a special eye out just for it. We do not need any built in traps -- there are enough as it is.

Original NASA ASRS Text

Title: B757 ACFT ON APCH DSNDED BELOW RESTR XING ALT WHILE FOLLOWING ILS GS.

Narrative: ON APCH TO RWY 25R LAX WHILE TRANSITIONING FROM THE MUDDE ARR, BONEZ TO FLUNG REQUIRES NON PRECISION APCH ALT XINGS BEFORE COUPLING THE ACFT TO THE ILS. APPARENTLY WHILE FOLLOWING THE GS INSTEAD OF ADHERING TO THE ALTS EXACTLY, I WENT BELOW THE ALT OF 8000 FT REQUIRED AT SQUIRT. THE WORKLOAD ON FINAL TEMPTS ONE TO FLY THE GS OR AT LEAST SOMEWHAT ABOVE IT, AND I ACCEPTED WHAT I THOUGHT WAS 'ONLY' 100-200 FT LOW INSTEAD OF BEING EXACT. FOR ONE, I SHALL BE MORE EXACTING AND LESS TEMPTED TOWARDS 'CLOSE ENOUGH FOR GOV WORK....' I DO RECOMMEND, HOWEVER, THAT THE XING ALT AT SQUIRT BE LOWERED TO A GS EQUIVALENT ALT AND THE AREA REQUIRING THE 8000 FT ALT BE LOWERED ALSO. FROM MY UNDERSTANDING, THIS XING RESTR IS 'BUSTED' QUITE OFTEN -- CERTAINLY NOT ON PURPOSE, AND APCH CTL KEEPS A SPECIAL EYE OUT JUST FOR IT. WE DO NOT NEED ANY BUILT IN TRAPS -- THERE ARE ENOUGH AS IT IS.

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.