GPWS call-outs

Phil747 · May 10, 2023 at 10:55 AM

Which aircraft have ‘approaching minimums’ callouts and which ones are replaced by ‘decision height’? I might be going crazy but I swear there was one Boeing aircraft that has the GPWS call it minimums over decision height but I’ve just landed 3 Boeing aircraft (777, 747, 787) and none of them have the callout as minimums, all ‘decision height’. Since the airbuses all call ‘Minumums’ before landing I definitely know it’s a Boeing that does it correctly where the others don’t. Is this also how it is IRL? I’ll check some landing videos but I’m pretty sure most of the real airliners are geared for ‘minimums’ and that ‘decision height’ is just an Aerofly thing.

Cheers

Jet-Pack (IPACS) · May 10, 2023 at 10:58 AM Official Post

If I remember correctly we currently have it programmed that "approaching decision height" and "decision height" is called out when it's a radar minimum and "approaching minimums" and "minimums" when it is a barometric minimum. I'm not sure if this is how the real Boeing aircraft do that. I think it is an airline option which callout is used.

Phil747 · May 10, 2023 at 11:43 AM

Quote from Jet-Pack (IPACS)

If I remember correctly we currently have it programmed that "approaching decision height" and "decision height" is called out when it's a radar minimum and "approaching minimums" and "minimums" when it is a barometric minimum. I'm not sure if this is how the real Boeing aircraft do that. I think it is an airline option which callout is used.

So this changes depending on airport used?

I was going to check last night but I’ll go on YouTube and find some 747 or 777 approaches and see what the call-outs are like

Thanks

Jet-Pack (IPACS) · May 10, 2023 at 12:28 PM Official Post

Quote from Phil747

So this changes depending on airport used?
I was going to check last night but I’ll go on YouTube and find some 747 or 777 approaches and see what the call-outs are like
Thanks

No, it depends on how you enter the minimums. Currently the route or airport does not affect the minimum selection.

Phil747 · May 10, 2023 at 6:41 PM

Quote from Jet-Pack (IPACS)

No, it depends on how you enter the minimums. Currently the route or airport does not affect the minimum selection.

Oh. So down to FMC planning?

Jet-Pack (IPACS) · May 10, 2023 at 6:43 PM Official Post

In Boeing aircraft the minimum selection is done in the EFIS control panel, so independent of the FMC.

Overloaded · May 11, 2023 at 5:54 AM

Look at the glareshield selector knob for setting the minimums, pick RADIO for height above the runway (the only one available with the 737-500) Or BARO for the altitude above mean sea level to be the alert. For Livermore ILS see the 600 and 200 mimimums in the table at the bottom of the approach plate, use RADIO and 200 feet or BARO and 600 feet.

Baro is good if there is irregular high ground before reaching the runway. It would have the radio altimeter returns fluctuating and meaningless.

Ethan's Aviation · August 11, 2023 at 4:53 PM

How do you turn off Decision height? Even when I haven't set it it still calls it out. Also, when I have set a higher Decision height it will replay again near the runway

Jet-Pack (IPACS) · August 12, 2023 at 8:19 AM Official Post

Quote from Ethan's Aviation

How do you turn off Decision height? Even when I haven't set it it still calls it out. Also, when I have set a higher Decision height it will replay again near the runway

Enter decisipn heiht NO into the MCDU APPR page

Ethan's Aviation · August 12, 2023 at 3:22 PM

Quote from Jet-Pack (IPACS)

Enter decisipn heiht NO into the MCDU APPR page

On boeing?

FrankLFRS · August 12, 2023 at 3:40 PM

“Decision Height” is on Boeing. MCDU on Airbus.

But the explanation of Jet-Pack (IPACS) seems to be about Boeing because it does not ring a bell to me!

Jet-Pack (IPACS) · August 13, 2023 at 7:39 AM Official Post

On Boeing aircraft you can set the decision height or minimum descent altitude in the EFIS control panel. Push the black button at the tip of the control know to reset them and to remove them from view.

Ethan's Aviation · August 13, 2023 at 3:26 PM

Quote from Jet-Pack (IPACS)

On Boeing aircraft you can set the decision height or minimum descent altitude in the EFIS control panel. Push the black button at the tip of the control know to reset them and to remove them from view.

I think my is bugged, it plays decison height no matter what I do. I reset it and it still played 'decision height' even with no alt set

Joao_Gabriel · August 13, 2023 at 4:30 PM

Quote from Ethan's Aviation

I think my is bugged, it plays decison height no matter what I do. I reset it and it still played 'decision height' even with no alt set

Perhaps you are not setting the minimums on the copilot's EFIS and only setting the minimums on the commander's EFIS.

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