Originally Posted by
PerfInit
The 737-800s have had a lot of trim air faults in the early days. There is a Boeing FCOM Bulletin titled Nuisance Zone Temp Light Illuminations on 737-800 Airplanes. The procedure is as follows:
After landing, prior to first power transfer:
Trim Air Switch
.. OFF
Air Conditioning System
____Pack(s), BLEEDS ON
Prior to takeoff, after last power transfer:
Trim Air Switch
.. ON
Thanks. Sounds like a legacy procedure that is not valid today. I've never had a zone temp light in an -800 or -900. I remember, maybe 2 in the -400 when we first got them. Still, if the cabin temp was somehow more stable or easier to control, I'd like to try it.
Procedures that have no basis in reality or are unnecessary annoy me.