A B767 on the lax civet prior to rustt intersection was changed from expect 25L to 24R. Aircraft descended low on profile as FMS updated. Runway changed back to 25L after skoll.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	763434
Time
Date	200711
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : skoll
State Reference	CA
Altitude	msl single value : 9000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 25l other
Route In Use	arrival star : civet
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	763434
Events
Anomaly	altitude deviation : overshoot altitude deviation : crossing restriction not met non adherence : clearance non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance

Narrative:

Inbound to lax via civet 5 for runway 25L (expected). Late handoff to socal (busy). They changed us to descend via civet 5 for runway 24R. Updated FMC (preloaded in route 2). Using autoplt for descent. After change to runway 24R executed; aircraft automation was not keeping up; so I manually intervened to get back on profile (VNAV/LNAV still engaged). In trying to get the aircraft caught up; and retuning ILS; rebriefing; and resetting; we inadvertently descended to approximately 9000 ft prior to skoll (10000A) caught error and climbed; crossing skoll at about 9850 ft. Were told to descend to 7000 ft for runway 25L (runway change). Again updated only ILS; left FMC's alone for the moment. Flew manually. Landing was uneventful. Attention to navigation is the priority; while monitoring automation. Automation may have let us down on VNAV/LNAV; but we should have caught it quicker.

Original NASA ASRS Text

Title: A B767 ON THE LAX CIVET PRIOR TO RUSTT INTXN WAS CHANGED FROM EXPECT 25L TO 24R. ACFT DSNDED LOW ON PROFILE AS FMS UPDATED. RWY CHANGED BACK TO 25L AFTER SKOLL.

Narrative: INBOUND TO LAX VIA CIVET 5 FOR RWY 25L (EXPECTED). LATE HDOF TO SOCAL (BUSY). THEY CHANGED US TO DSND VIA CIVET 5 FOR RWY 24R. UPDATED FMC (PRELOADED IN RTE 2). USING AUTOPLT FOR DSCNT. AFTER CHANGE TO RWY 24R EXECUTED; ACFT AUTOMATION WAS NOT KEEPING UP; SO I MANUALLY INTERVENED TO GET BACK ON PROFILE (VNAV/LNAV STILL ENGAGED). IN TRYING TO GET THE ACFT CAUGHT UP; AND RETUNING ILS; REBRIEFING; AND RESETTING; WE INADVERTENTLY DSNDED TO APPROX 9000 FT PRIOR TO SKOLL (10000A) CAUGHT ERROR AND CLBED; XING SKOLL AT ABOUT 9850 FT. WERE TOLD TO DSND TO 7000 FT FOR RWY 25L (RWY CHANGE). AGAIN UPDATED ONLY ILS; LEFT FMC'S ALONE FOR THE MOMENT. FLEW MANUALLY. LNDG WAS UNEVENTFUL. ATTN TO NAV IS THE PRIORITY; WHILE MONITORING AUTOMATION. AUTOMATION MAY HAVE LET US DOWN ON VNAV/LNAV; BUT WE SHOULD HAVE CAUGHT IT QUICKER.

Data retrieved from NASA's ASRS site as of January 2009 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.