Olendirk,
AOM and QRH's will vary, some will provide the factored landing distance, and some will not. It's up to you to check this, it should be clearly indicated in the content of the AOM/QRH.
What is important in the in-flight phase, is that if a new abnormality indicates a factor or additive over the NORMAL landing distance, then you should apply the correction to the normal landing distance to find the 'new' landing distance. This is then compared to the LDA. In-flight, you do not have to apply the 1.67 or 1.92 multiple, this should have been considered pre-flight.
An example - You depart with no abnormal configuration, and for your planned landing weight and environmental conditions the Landing Distance is 1000 M for a dry runway. You must ensure that the LDA at your destination is at least 1670 M. Let's assume that the LDA is exactly 1670 M, so you depart with just enough LDA available for arrival. En-route, Anti-Skid becomes Inop, and your QRH indicates that the landing distance required is 1.3 times that of normal, i.e. you now require 1300 M. As you have 1670 M available, you may continue and land, there is no need to add any further factor to the new 1300 M landing distance required.
Regards,
Old Smokey