Flight crew flies below assigned crossing altitude on approach into lax.

Attributes
ACN	343880
Time
Date	199608
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lax
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
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
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 220 flight time total : 5000 flight time type : 700
ASRS Report	343880
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : overshoot non adherence : published procedure
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : detected after the fact none taken : insufficient time
Consequence	faa : investigated
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
Airport	procedure or policy : unspecified

Narrative:

After uncommanded roll of aircraft at arnes intersection, autoplt was disconnected and manually flown for remainder of approach. GS was intercepted at fuelr intersection and flown to the runway. Altitude approaching hunda intersection was below the 3500 ft stepdown. Cause for altitude violation: interception of GS too early on approach. Manual flown approach (glass cockpit) from 30 mi out may also have contributed. Callback conversation with reporter revealed the following information: during callback, the reporter stated that he disconnected the autoplt because of slight wake turbulence from proceeding aircraft. As he took manual control of the aircraft, he started to fly the GS of the ILS, this would put him low over fuelr. This pilot felt that by flying the GS, it would always keep the aircraft clear of any restr altitudes. He stated he was not familiar with the fuelr restr when flying the GS regarding how critical the crossing altitude is. Reporter also stated that an advisory from the controller who issues the ILS clearance regarding, 'comply with all crossing altitudes,' would have increased his awareness regarding the importance of observing crossing altitudes.

Original NASA ASRS Text

Title: FLC FLIES BELOW ASSIGNED XING ALT ON APCH INTO LAX.

Narrative: AFTER UNCOMMANDED ROLL OF ACFT AT ARNES INTXN, AUTOPLT WAS DISCONNECTED AND MANUALLY FLOWN FOR REMAINDER OF APCH. GS WAS INTERCEPTED AT FUELR INTXN AND FLOWN TO THE RWY. ALT APCHING HUNDA INTXN WAS BELOW THE 3500 FT STEPDOWN. CAUSE FOR ALT VIOLATION: INTERCEPTION OF GS TOO EARLY ON APCH. MANUAL FLOWN APCH (GLASS COCKPIT) FROM 30 MI OUT MAY ALSO HAVE CONTRIBUTED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: DURING CALLBACK, THE RPTR STATED THAT HE DISCONNECTED THE AUTOPLT BECAUSE OF SLIGHT WAKE TURB FROM PROCEEDING ACFT. AS HE TOOK MANUAL CTL OF THE ACFT, HE STARTED TO FLY THE GS OF THE ILS, THIS WOULD PUT HIM LOW OVER FUELR. THIS PLT FELT THAT BY FLYING THE GS, IT WOULD ALWAYS KEEP THE ACFT CLR OF ANY RESTR ALTS. HE STATED HE WAS NOT FAMILIAR WITH THE FUELR RESTR WHEN FLYING THE GS REGARDING HOW CRITICAL THE XING ALT IS. RPTR ALSO STATED THAT AN ADVISORY FROM THE CTLR WHO ISSUES THE ILS CLRNC REGARDING, 'COMPLY WITH ALL XING ALTS,' WOULD HAVE INCREASED HIS AWARENESS REGARDING THE IMPORTANCE OF OBSERVING XING ALTS.

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.