FF Trent 700
Hi There,
the FF parameter discussion interested me so I thought I would observe what happened on a take off. Tha parameters were:
EDDM 08R,
OAT 22C
W/V LV
PA 1500'
Q1021
TOW 197T
Flex 47
Conf 1+F
FF at EPR reaching target started at 8300 Kg/h per engine and steadily climbed throughout the take-off run to 8900 Kg/h. At no time did the FF stabilise at a particular figure. This may be a function of the MAESTO on the Trent, but I doubt it since the fan instability is below the EPR target. With that first (brief) look I am inclined to consider a FF target as being unhelpful in establishing whether the engine has achieved the correct thrust. Maybe the GE and Pratts are more stable on their FF during the T/O run.
Regards
TOD