B757 multiple gars because of jetblast at low altitudes causing ctlability problems at lax.

Attributes
ACN	432908
Time
Date	199904
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	agl single value : 50
Environment
Flight Conditions	Marginal
Weather Elements	Rain
Light	Daylight
Aircraft 1
Controlling Facilities	tower : lax.tower
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 : 24r
Flight Phase	descent : approach landing : go around
Route In Use	approach : traffic pattern arrival star : mudd 1
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : lax.tower
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	ground : position and hold ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 17000 flight time type : 2000
ASRS Report	432908
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	inflight encounter : wake turbulence inflight encounter other other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : took precautionary avoidance action flight crew : executed go around
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Environmental Factor Airport Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

In sum: B757 crew arriving lax making approach and landing to runway 25R. At about 1500 ft AGL, an aircraft on taxiway F was cleared into position on runway 25L. At 50 ft AGL, reporter aircraft experienced uncontrollable roll from jetblast and initiated go around. The scenario was repeated for a second go around before the lax tower stopped clearing aircraft into position in front of traffic on short final. The reporter contact the tower operator at the time and discussed the severity of the situation that was created and expressed about the safety of other aircraft landing under similar conditions.

Original NASA ASRS Text

Title: B757 MULTIPLE GARS BECAUSE OF JETBLAST AT LOW ALTS CAUSING CTLABILITY PROBS AT LAX.

Narrative: IN SUM: B757 CREW ARRIVING LAX MAKING APCH AND LNDG TO RWY 25R. AT ABOUT 1500 FT AGL, AN ACFT ON TXWY F WAS CLRED INTO POS ON RWY 25L. AT 50 FT AGL, RPTR ACFT EXPERIENCED UNCTLABLE ROLL FROM JETBLAST AND INITIATED GAR. THE SCENARIO WAS REPEATED FOR A SECOND GAR BEFORE THE LAX TWR STOPPED CLRING ACFT INTO POS IN FRONT OF TFC ON SHORT FINAL. THE RPTR CONTACT THE TWR OPERATOR AT THE TIME AND DISCUSSED THE SEVERITY OF THE SIT THAT WAS CREATED AND EXPRESSED ABOUT THE SAFETY OF OTHER ACFT LNDG UNDER SIMILAR CONDITIONS.

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.