This question was asked on 20th October 2010
(Look about page 5 of this forum)
737 NN LDG Config
Hi,
why performing the "Runaway Stabilizer NNC" the QRH ask for a "normal" Flaps and Vref for landing, while performing the "Stabilizer Trim Inoperative NNC" the QRH asks for a Flaps 15 LDG ?
In both situations both the cut-out trim switches (autopilot & Main elec) are OFf, so the flight conditions should be the same......
thanks in advance
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Our Ops Dept asked this very question of Boeing (2008) and the reply was as follows;
"In the RUNAWAY STABILIZER non normal condition, manual trim is always readily available, there is no need to limit the landing flap to flaps 15.
The STABILIZER TRIM INOPERATIVE checklist may be addressing a condition in which the crew must continuously break out the disconnect clutch or in which the stabilizer is physically jammed; it is therefore more appropriate to limit the flight crew to flaps 15 to avoid large trim requirements."
Hope this helps