Aircraft holding short, #1 for takeoff. Last min computer entries by first officer while captain off frequency to give PA for flight attendants. When captain back on frequency, first officer said 'position and hold.' aircraft on runway and tower informs them they were supposed to hold short.

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Attributes
ACN	323955
Time
Date	199512
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : stl
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground : holding ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 170 flight time total : 18000 flight time type : 900
ASRS Report	323955
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	incursion : runway non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Short taxi time, delayed weight and balance, no traffic delay resulted in time squeeze at runway. Captain left tower frequency for approximately 15 seconds to make PA seating flight attendants prior to takeoff. At that time, we were #1 holding short. The aircraft on the runway commenced his takeoff roll. When the captain finished the PA and returned to the frequency, the first officer said 'position and hold.' he was very busy inputting the weight and balance numbers and setting up takeoff speeds so he might have been 'overloaded.' we cleared the approach zone and taxied into position and set the parking brake. The tower controller then informed us that we were supposed to be holding short. Although there was no inbound traffic to this runway and we could remain there. Thereafter we were cleared for takeoff following traffic from the other side of the airport. This incident is clearly a result of the system riding on one person alone. If he makes a mistake, the system fails. That's why 2 people (both pilots) should be on frequency as much as possible.

Original NASA ASRS Text

Title: ACFT HOLDING SHORT, #1 FOR TKOF. LAST MIN COMPUTER ENTRIES BY FO WHILE CAPT OFF FREQ TO GIVE PA FOR FLT ATTENDANTS. WHEN CAPT BACK ON FREQ, FO SAID 'POS AND HOLD.' ACFT ON RWY AND TWR INFORMS THEM THEY WERE SUPPOSED TO HOLD SHORT.

Narrative: SHORT TAXI TIME, DELAYED WT AND BAL, NO TFC DELAY RESULTED IN TIME SQUEEZE AT RWY. CAPT LEFT TWR FREQ FOR APPROX 15 SECONDS TO MAKE PA SEATING FLT ATTENDANTS PRIOR TO TKOF. AT THAT TIME, WE WERE #1 HOLDING SHORT. THE ACFT ON THE RWY COMMENCED HIS TKOF ROLL. WHEN THE CAPT FINISHED THE PA AND RETURNED TO THE FREQ, THE FO SAID 'POS AND HOLD.' HE WAS VERY BUSY INPUTTING THE WT AND BAL NUMBERS AND SETTING UP TKOF SPDS SO HE MIGHT HAVE BEEN 'OVERLOADED.' WE CLRED THE APCH ZONE AND TAXIED INTO POS AND SET THE PARKING BRAKE. THE TWR CTLR THEN INFORMED US THAT WE WERE SUPPOSED TO BE HOLDING SHORT. ALTHOUGH THERE WAS NO INBOUND TFC TO THIS RWY AND WE COULD REMAIN THERE. THEREAFTER WE WERE CLRED FOR TKOF FOLLOWING TFC FROM THE OTHER SIDE OF THE ARPT. THIS INCIDENT IS CLRLY A RESULT OF THE SYS RIDING ON ONE PERSON ALONE. IF HE MAKES A MISTAKE, THE SYS FAILS. THAT'S WHY 2 PEOPLE (BOTH PLTS) SHOULD BE ON FREQ AS MUCH AS POSSIBLE.

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.