<< >> NASA ASRS Report 432693, March 1999

A B757 was given a heading and altitude change with on approach due to an overshoot on parallel runway. Aircraft descended below assigned altitude.

Attributes
ACN	432693
Time
Date	199903
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl bound lower : 4650 msl bound upper : 5000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 25r
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : sct.tracon
Operator	Other
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Navigation In Use	ils localizer & glide slope : 24
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Experience	flight time last 90 days : 160 flight time total : 11000 flight time type : 1500
ASRS Report	432693
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Cleared for ILS runway 25R at approximately 200 KIAS assigned and descending at approximately 1000 FPM. At 5100 ft MSL, controller issued turn left to 180 degrees and maintain 5000 ft. Coupled approach with multiple autoplts on, aircraft descended to approximately 4650 ft MSL during turn and returned to leveloff at 5000 ft. It is unrealistic to expect a leveloff at 5000 ft with those instructions and speed assignment. Maybe the controller expected a descent below assigned altitude and then a return to 5000 ft. We were then given a turn back to intercept final and another approach clearance prior to completing our turn to 180 degrees. The reason the controller issued the turn to 180 degrees and leveloff at 5000 ft was rptedly due to an overshoot by an aircraft on approach to runway 24 (north complex).

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Original NASA ASRS Text

Title: A B757 WAS GIVEN A HDG AND ALT CHANGE WITH ON APCH DUE TO AN OVERSHOOT ON PARALLEL RWY. ACFT DSNDED BELOW ASSIGNED ALT.

Narrative: CLRED FOR ILS RWY 25R AT APPROX 200 KIAS ASSIGNED AND DSNDING AT APPROX 1000 FPM. AT 5100 FT MSL, CTLR ISSUED TURN L TO 180 DEGS AND MAINTAIN 5000 FT. COUPLED APCH WITH MULTIPLE AUTOPLTS ON, ACFT DSNDED TO APPROX 4650 FT MSL DURING TURN AND RETURNED TO LEVELOFF AT 5000 FT. IT IS UNREALISTIC TO EXPECT A LEVELOFF AT 5000 FT WITH THOSE INSTRUCTIONS AND SPD ASSIGNMENT. MAYBE THE CTLR EXPECTED A DSCNT BELOW ASSIGNED ALT AND THEN A RETURN TO 5000 FT. WE WERE THEN GIVEN A TURN BACK TO INTERCEPT FINAL AND ANOTHER APCH CLRNC PRIOR TO COMPLETING OUR TURN TO 180 DEGS. THE REASON THE CTLR ISSUED THE TURN TO 180 DEGS AND LEVELOFF AT 5000 FT WAS RPTEDLY DUE TO AN OVERSHOOT BY AN ACFT ON APCH TO RWY 24 (N COMPLEX).

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.