737 CatIII landing mass limits in icing

[BOAC]

Does anyone have a link to the figures for reduction of MLM for Classics and NGs in icing conditions on a CatIII approach? I seem to recall BA used around 3600kg for the 3/4/500 but cannot find a reference.

[CaptainSandL]

I think you mean the "Landing Climb Limit Weight" graph which is not just for an autoland. The exact figures depend upon series & engine rating but for a 20K 737-300 the wording is:

"If operating in icing conditions during any part of the flight when the forecast landing temperature is 8C reduce the flap 40 climb limit weight by 4670kg or the flap 30 climb limit weight by 4360kg or the flap 15 climb limit weight by 4170kg."

Ref FPPM 1.3.7

S&L

[BOAC]

Thanks Cpt S - yes, brain fade as usual - it was the F40 figures I was after. Where is the graph located and do you have the figures for a 700?

[CaptainSandL]

For a 737-700/CFM56-7B20

"When operating in icing conditions during any part of the flight with the forecast landing temperature below 10°C, decrease the landing climb limit by 5150 kg."

Ref FPPM, TAKEOFF AND LANDING - Landing, Page 1.5.5

[Granite City Flyer]

From our low vis checklist for 737-700W with CFM56-7B24 engines

With A/C ‘OFF’ the climb gradient will be achieved at 1800 kgs HIGHER weight. With Engine Anti icing ‘ON’ the climb gradient limit will be achieved at 200 kgs LOWER weight. With Wing and Engine Anti icing ‘ON’ the climb gradient limit will be achieved at 600 kgs LOWER weight.
If operating in icing conditions during any part of the flight when the forecast landing temperature is below 10 C, decrease the landing climb limit by 4800 kgs

[BOAC]

Thank you all - Cpt S has provided me with info via PM and I have sufficient at the moment.