Dual Hydraulic G+B Failure, the QRH reference is IFP-PER-29 page 1/6.
Our aircraft are pretty old, all the MSNs are in the 200s and 300s, engines are PW4168.
Dry runway, landing weight 225 tons, Slats <1, ISA, sea level, no thrust reverser allowance, Overweight landing procedure applied. Ignoring ALT, WIND, TEMP, SLOPE corrections for purpose of example.
Ref distance for 190 ton is 2460.
WGT correction is +310 for every 10 tons over 190.
OVW correction is +570.
Landing distance required therefore is 2460 + (3.5 x 310) + 570 = 4115.
In that table I'm referring to, the new factor for OVW landing is on the far right just next to REV. Do you not have it in yours?
And furthermore as a direct quote from the FCTM, section SI-090 page 16/28, "Inflight landing distance with failure"
Note: In the case of an overweight landing both the WGT and OVW should be applied.
- WGT correction to reflect the actual aircraft landing weight
- OVW correction to reflect the use of the Overweight Landing Procedure