A B747-400 departing syd is advised after the fact that during a xbleed start enough debris was move...

Attributes
ACN	632317
Time
Date	200409
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : yssy.airport
State Reference	FO
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 150 flight time total : 14000 flight time type : 1400
ASRS Report	632317
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa other other : 4
Resolutory Action	none taken : anomaly accepted
Consequence	faa : investigated Other
Supplementary
Problem Areas	Aircraft Airport Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

#4 high pressure bleed valve closed, deferred. Normal departure from gate at 520000 pounds. Planned 2 engine taxi, normal for this leg, with long taxi to runway 34L. APU turned off. Away from the ramp area and clear of aircraft behind, on taxiway a past A2 to runway 34L, accomplished xbleed start of other engines. Ran up #1 outboard to increase duct pressure. Heard caller to ground/tower complain about jet blast from outboard engine. Reduced thrust immediately. Later syd operations received an incident report. Closed taxiway a for (2 hours?) grass/dirt/debris on taxiway and rerouted aircraft with alternate taxi instructions. Away from the ramp and in the open with no aircraft behind, I felt I was exercising caution with minimum thrust on #1 outboard. Did not advise tower of run-up. In a review of the charts, there is no requirement to advise ground/tower of run-up or engine start. There is no notice of unstable off taxiway ground conditions and the avoidance of high thrust away from the apron. Also, there is no advice in handbook for taxi out, APU on or off. MEL item (bleed) placard has no advice for engine start 'complications.' in retrospect, an APU left 'on' is a better option.

Original NASA ASRS Text

Title: A B747-400 DEPARTING SYD IS ADVISED AFTER THE FACT THAT DURING A XBLEED START ENOUGH DEBRIS WAS MOVED TO CLOSE TXWY A, EVEN THOUGH PWR WAS REDUCED AS SOON AS A COMPLAINT WAS HEARD ON THE RADIO.

Narrative: #4 HIGH PRESSURE BLEED VALVE CLOSED, DEFERRED. NORMAL DEP FROM GATE AT 520000 LBS. PLANNED 2 ENG TAXI, NORMAL FOR THIS LEG, WITH LONG TAXI TO RWY 34L. APU TURNED OFF. AWAY FROM THE RAMP AREA AND CLR OF ACFT BEHIND, ON TXWY A PAST A2 TO RWY 34L, ACCOMPLISHED XBLEED START OF OTHER ENGS. RAN UP #1 OUTBOARD TO INCREASE DUCT PRESSURE. HEARD CALLER TO GND/TWR COMPLAIN ABOUT JET BLAST FROM OUTBOARD ENG. REDUCED THRUST IMMEDIATELY. LATER SYD OPS RECEIVED AN INCIDENT RPT. CLOSED TXWY A FOR (2 HRS?) GRASS/DIRT/DEBRIS ON TXWY AND REROUTED ACFT WITH ALTERNATE TAXI INSTRUCTIONS. AWAY FROM THE RAMP AND IN THE OPEN WITH NO ACFT BEHIND, I FELT I WAS EXERCISING CAUTION WITH MINIMUM THRUST ON #1 OUTBOARD. DID NOT ADVISE TWR OF RUN-UP. IN A REVIEW OF THE CHARTS, THERE IS NO REQUIREMENT TO ADVISE GND/TWR OF RUN-UP OR ENG START. THERE IS NO NOTICE OF UNSTABLE OFF TXWY GND CONDITIONS AND THE AVOIDANCE OF HIGH THRUST AWAY FROM THE APRON. ALSO, THERE IS NO ADVICE IN HANDBOOK FOR TAXI OUT, APU ON OR OFF. MEL ITEM (BLEED) PLACARD HAS NO ADVICE FOR ENG START 'COMPLICATIONS.' IN RETROSPECT, AN APU LEFT 'ON' IS A BETTER OPTION.

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.

A B747-400 departing syd is advised after the fact that during a xbleed start enough debris was moved to close taxiway a, even though power was reduced as soon as a complaint was heard on the radio.