As you're aware, it was many years (decades
!) ago that we performed these flights!
Based upon the following information from the SAFAIR website
(http://www.safair.co.za/)
Weight
Maximum certified take-off weight 70 307kg (155 000lbs)
Maximum certified landing weight 61 235kg (135 000lbs)
Maximum certified zero fuel weight 57 727kg (127 000lbs)
Basic empty weight 34 545kg ( 76 000lbs)
Average APS weight 35 000kg ( 77 000lbs)
I'd say it was the MXLWT!
That would leave you with approx 4tons of fuel at destination. Not too much if you have to divert to CYYR, a distance of 779mls!
!
G/C distance is 1373 per
http://gc.kls2.com/
Cheers
thetexpat