A320 FLT CREW DEVIATES FROM THE SID WHILE ADDRESSING A 'GREEN SYS' HYD ECAM.

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FLT WAS A TYPE 2 FERRY (SPECIAL FLT PERMIT) WITH A TEMPORARY REPAIR FOR A HYD (BLUE SYS) LEAK. JUST AFTER TKOF; AN ECAM CAUTION BELL ALERTED TO A 'GREEN ENG #1 PUMP LOW PRESSURE' HYD FAILURE. ECAM IRREGULAR PROCS WERE COMPLETED. DURING RESOLUTION OF THE ECAM; THE ACFT CONTINUED ON THE INITIAL 255 DEG MAGNETIC HDG BEYOND THE INBOUND RADIAL TO POM AS DEPICTED ON THE SID. ONT APCH CTL ALERTED US TO THE DEV AND VECTORED US N TO RECAPTURE THE SID GND TRACK. THERE WERE NO TCAS EVENTS; AND WE WERE NOT AWARE OF ANY LOSS OF SEPARATION WITH OTHER IFR TFC; ALTHOUGH THE CTLR MADE IT CLR THAT DEV FROM THE SID WAS NOT ACCEPTABLE. A MAJOR FACTOR IN THIS EVENT WAS THE UNTIMELY DISTR CAUSED BY THE HYD PUMP FAILURE; WHICH WAS PARTICULARLY DISCONCERTING TO THE CREW SINCE THERE WAS A KNOWN ISSUE WITH ANOTHER HYD SYS. THE POTENTIAL FOR A SERIOUS EMER DUE TO POSSIBLE MULTIPLE HYD SYS FAILURES WAS IMMEDIATELY APPARENT; AND THE CREW MOMENTARILY ALLOWED THE ACFT TO DEVIATE FROM THE SID WHILE ASSESSING THE CONDITION OF THE ACFT. ADDITIONAL HUMAN FACTORS CONSIDERATIONS: 1) AIRBUS CRT DISPLAYS ARE CHARACTERISTICALLY DIM AND DIFFICULT TO READ IN BRIGHT SUNLIGHT. THE LOW SUN WAS DIRECTLY IN FRONT OF THE ACFT; MAKING THE NAV DISPLAYS EVEN MORE DIFFICULT TO SEE THAN USUAL. 2) ALTHOUGH NOT AN EXCEPTIONALLY LONG DUTY DAY OR LONG TIME SINCE WAKING; CREW HAD BEEN WAITING FOR THE ACFT FOR 6 HRS AT ONT WHILE MAINT CTL AND LINE MAINT RESOLVED ISSUES WITH THE CONFIGN OF THE ACFT FOR THE FERRY. THE CREW HAD FLOWN AN EARLY LCL TEST FLT; THEN DEADHEADED TO ONT VIA BUR. FATIGUE MAY HAVE BEEN A FACTOR. 3) DESPITE THE LONG WAIT; FINAL PREPARATIONS FOR THE FLT WERE SOMEWHAT RUSHED. THE STATION WAS PREPARING TO SVC A LINE TRIP WHICH LED TO A BIT OF A HURRIED DEP. ALTHOUGH THE SID WAS BRIEFED AND XCHKED IN THE FMC; THE INITIAL TURN WAS DELAYED WHEN THE CREW WAS DISTR BY THE ECAM.