A B737-700 captain taxied to very end of sjc runway 30L on taxiway A1 at which point both pilots not...

Attributes
ACN	1281125
Time
Date	201507
Local Time Of Day	1201-1800
Place
Locale Reference	SJC.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Component
Aircraft Component	Aero Charts
Person 1
Function	First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 158
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Published Material / Policy Ground Event / Encounter Other / Unknown

Narrative:

Captain taxied into position for takeoff at the very end of the approach end of 30L. As he turned to line up on centerline; he was positioned significantly southeast of the yellow line leading from A1 taxiway to the centerline 30L. This position seemed close to the blast fence for the approach end of 30L. Too close for my comfort; and I stated my preference was to be on the yellow line; not as close as we were to the blast fence.I have seen this technique in the past which I have assumed is used to maximize the amount of runway in front of the aircraft when takeoff power is applied. The captain stated to me later that he does use this technique to give him more available runway and he thought that our performance data is always calculated from '90 feet from the end of the runway.' based on visual factors; I thought we got too close to the blast fence on the approach end of 30L just prior to takeoff.my safety suggestion would be to survey the distance of that fence from the end of 30L and examine the use of the technique of taxiing very close to the end of a runway before takeoff.

Original NASA ASRS Text

Title: A B737-700 Captain taxied to very end of SJC Runway 30L on Taxiway A1 at which point both pilots noted how close the wingtip passed by the blast fence. Runway 30R was closed for construction.

Narrative: Captain taxied into position for takeoff at the very end of the approach end of 30L. As he turned to line up on centerline; he was positioned significantly southeast of the yellow line leading from A1 Taxiway to the centerline 30L. This position seemed close to the blast fence for the approach end of 30L. Too close for my comfort; and I stated my preference was to be on the yellow line; not as close as we were to the blast fence.I have seen this technique in the past which I have assumed is used to maximize the amount of runway in front of the aircraft when takeoff power is applied. The Captain stated to me later that he does use this technique to give him more available runway and he thought that our performance data is always calculated from '90 feet from the end of the runway.' Based on visual factors; I thought we got too close to the blast fence on the approach end of 30L just prior to takeoff.My safety suggestion would be to survey the distance of that fence from the end of 30L and examine the use of the technique of taxiing very close to the end of a runway before takeoff.

Data retrieved from NASA's ASRS site 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 B737-700 captain taxied to very end of sjc runway 30L on taxiway A1 at which point both pilots noted how close the wingtip passed by the blast fence. Runway 30R was closed for construction.