B757 flies low during ILS runway 25L approach into lax. B757 (148 pt 60).

Attributes
ACN	347497
Time
Date	199609
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	msl bound lower : 8000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 200 flight time total : 22000 flight time type : 1800
ASRS Report	347497
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : unspecified 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
Situations
Airport	procedure or policy : unspecified

Narrative:

For yrs pilots have used runway 25L GS for descent as a transition between civet profile and runway 25L ILS and it always appeared to meet all altitude restr. It now appears to be about 100 ft below all altitude restr. The word needs to be put out to pilots via note on approach charts GS unusable for descent purpose until a specific point. Callback conversation with reporter revealed the following information: during callback the reporter was explained how a new ILS for runway 25L would affect all the crossing altitudes during the approach into lax. He was also inquired of as to the helpfulness of different terminology for the approach clearance. He felt strongly that if the approach clearance also stated that aircraft should comply with all altitude restr, it would alert the flight crew as if a red flag were waving in front of them, reminding them to keep the altitudes as depicted on the arrival chart. This flight crew had no dealings with the FAA.

Original NASA ASRS Text

Title: B757 FLIES LOW DURING ILS RWY 25L APCH INTO LAX. B757 (148 PT 60).

Narrative: FOR YRS PLTS HAVE USED RWY 25L GS FOR DSCNT AS A TRANSITION BTWN CIVET PROFILE AND RWY 25L ILS AND IT ALWAYS APPEARED TO MEET ALL ALT RESTR. IT NOW APPEARS TO BE ABOUT 100 FT BELOW ALL ALT RESTR. THE WORD NEEDS TO BE PUT OUT TO PLTS VIA NOTE ON APCH CHARTS GS UNUSABLE FOR DSCNT PURPOSE UNTIL A SPECIFIC POINT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: DURING CALLBACK THE RPTR WAS EXPLAINED HOW A NEW ILS FOR RWY 25L WOULD AFFECT ALL THE XING ALTS DURING THE APCH INTO LAX. HE WAS ALSO INQUIRED OF AS TO THE HELPFULNESS OF DIFFERENT TERMINOLOGY FOR THE APCH CLRNC. HE FELT STRONGLY THAT IF THE APCH CLRNC ALSO STATED THAT ACFT SHOULD COMPLY WITH ALL ALT RESTR, IT WOULD ALERT THE FLC AS IF A RED FLAG WERE WAVING IN FRONT OF THEM, REMINDING THEM TO KEEP THE ALTS AS DEPICTED ON THE ARR CHART. THIS FLC HAD NO DEALINGS WITH THE FAA.

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.