If you are VNAVing down to a DDA, you will have to set it on the go and treat the DDA like a DH. Think of the altitude select window as a stop sign. If you are descending in a vertical mode and you hit any altitude set it the window, the system will go into alt hold unless you are on a precision vertical mode. The OP gave us a MDA of 353. I would have 400 in the window, and would set the missed app altitude after I I'm in ALT hold at 400. Since you are in VNAV, you should technically be using a DDA of 403(MDA + 50ft). You would have to set the missed app alt on the go after reaching your mins of 403.

In the NG, you can still set the missed app alt once you are 300 below that alt on the approach. You don't have to wait to go missed. It varies from operator to operator, but it's not required.

out of curiosity, what would happen if I did it sooner? Would airplane revert to ALT ACQ?

out of curiosity, what would happen if I did it sooner? Would airplane revert to ALT ACQ?

Depends on your mode. If you were in VNAV, I think it would go to VNAV ALT and if you weren't, like you said, it'd go to ALT ACQ/HOLD.

I've been wondering the same thing. Thanks for bringing up the topic for discussion.So what happens when you're not given a MDA? Instead, all that you are given is a DA(h). Refer to the public chart below. I also have company charts, and they don't specify an MDA either.http://www.aip.net.n...N_45.3_45.4.pdfThe chart is for an RNAV(RNP) approach into Queenstown, New Zealand.The approach procedure I use is in the FCTM section 5.67 - Inst App - RNAV(RNP) SAAAR/AR.Ashley Frew.

RNPs have a DA, but that doesn't really change the procedure. You can still reset the missed at the same time as on any other non-precision approach.My company actually sets field elevation in the MCP once inside an IAF, but that's our own procedure.

In the NG, you can still set the missed app alt once you are 300 below that alt on the approach. You don't have to wait to go missed. It varies from operator to operator, but it's not required.

thats true, but seems a little late for my taste with a DDA of 403. In this case, i would set it as i went below the DDA with the intentions of landing. If i go missed at the DDA, im setting on the go.

thats true, but seems a little late for my taste with a DDA of 403. In this case, i would set it as i went below the DDA with the intentions of landing. If i go missed at the DDA, im setting on the go.

Late? If the FAF is, let's say 3300' and you set the missed alt when below 3000', that seems a lot earlier than at 403'. That close to the ground, I don't want to be monkeying with the MCP if I don't have to.

RNPs have a DA, but that doesn't really change the procedure. You can still reset the missed at the same time as on any other non-precision approach.

Noted. Thank you.Ashley Frew.

thats true, but seems a little late for my taste with a DDA of 403. In this case, i would set it as i went below the DDA with the intentions of landing. If i go missed at the DDA, im setting on the go.

Whoops, disregard. I have gulfstream procedures on the brain. Habbits are hard to break. We have a couple of NGs but i don't fly them lol. Darn Gulfstream pilots in a NG forum.