>My point was that in some cases reversers aren't needed, and I>expect that there's a document somewhere in the emergency>procedures about runway length limitations when reversers are>INOP.>>Reversers aren't factored into runway distance calculations due to their unpredictable nature. IRL, during certification for landing distances, TR's are not used. Direct quote from the AOM:No credit is taken for use of thrust reversers. All landing performance data is without TR's.Cheers,JohnBoeing 727/737 & Lockheed C-130/L-100 Mechanichttp://www.precisionmanuals.com/images/forum/ng_driver.jpg

Tim Indeed there is, Landing performance is always clauclated based upon the reversers being locked out bu there is a portion of the QRH that tells us what factors to apply to the landing distance performance depending on the given failures.RegardsKris