TCAS TA only.
It is a recommendation that anytime the a/c has a significant performance degradation the TCAS should be TA only. There are a variety of scenarios which would require this. Not all are mentioned in QRH and require airmanship. In some scenarios this selection appears quite early in the QRH list of actions, good idea.
However, in Engine failure case it is No.8 and takes quite a while to reach it. In the sim I timed it at nearly 2 minutes with some slow cadets. ANC is good. QRH comers under C and thus the start of the QRH can be after some time.
In Eng Fire/SEV DAM/SEP it is No. 12. It takes an absolute age to select TA Only, all the while you have lost 50% thrust and can not follow an RA.
Worse; in Volcanic Ash = close both T.L’s and no mention of TA Only. High Oil Temp, Low Oil Pressure – no mention of TA only but 1 engine is at reduced thrust.
This is very inconsistent on the one hand, and when mentioned it is far too late. Just imagine what is happening in the cockpit during a high level engine failure. High work activity with procedures and ATC. (perhaps non radar), then in the middle you get a level off or even climb RA. What are you going to do? No choice, but can you comply. Surely you need to broadcast to all a/c ASAP that you are a wounded bird and tell them to get put of the way. TA only should almost be first action. It could save your neck and many others.
How can it be that some QRH’s involving lost of thrust include “TA Only” and other do not?