Originally Posted by
DaveReidUK
Boeing's Emergency AD says nothing of the sort.
It's not up to Boeing what an airline does or doesn't put in its FOM - the AD refers instead to the Airplane Flight Manual (AFM), where Boeing does have the ability to require changes as the AFM forms part of the aircraft certification.
One might have hoped that Avherald would understand the difference between the two publications.
In any case it does seem the pilots were not as informed as they should have been.
It turned out, that only very cursory knowledge about the stab trim runaway procedure exists amongst the flight crew of Ethiopian Airlines even 5 months after the EAD was distributed. In particular, none of the conditions suggesting an MCAS related stab trim runaway was known with any degree of certainty. In that context the recommendation by the accident flight's first officer to use the TRIM CUTOUT switches suggests, that he was partially aware of the contents of the EAD and reproduced some but not all of the provisions and not all of the procedure, which may or may not explain some of the obvious omissions in following the procedure in full
The entire article is well worth reading also has thoughts on ability to manual trim etc
Crash: Ethiopian B38M near Bishoftu on Mar 10th 2019, impacted terrain after departure