<![CDATA[ISA]]>The manual only provides ISA -30 to ISA +30. But I regurlarly get -50. Seems odd, can anyone shed a light on that?

]]>https://community.justflight.com/topic/8586/isaRSS for NodeWed, 19 Aug 2026 13:55:32 GMTSun, 06 Jul 2025 14:12:37 GMT60<![CDATA[Reply to ISA on Fri, 05 Jun 2026 05:19:02 GMT]]>It's simply the difference between ISA and OAT. You will come up with either a + or a - difference from ISA. With that you enter the tables. Say you're at FL370. Either the POH (ISA Power setting table) or the aircraft will tell you that ISA is -57°C. Now check you're OAT (IOAT). If your OAT is -47°C, then you're at ISA+10 (10°C warmer).

Caution against comparing IOAT value on the instrument against the table value. This value changes with speed, and as your power setting is not set yet, the difference in values might differ as you try to set the power setting.

]]>https://community.justflight.com/post/50834https://community.justflight.com/post/50834Fri, 05 Jun 2026 05:19:02 GMT<![CDATA[Reply to ISA on Thu, 28 May 2026 00:26:20 GMT]]>@Kaaplink Is that the order? (ISA - OAT), or does it not matter?

Tks!

]]>https://community.justflight.com/post/50729https://community.justflight.com/post/50729Thu, 28 May 2026 00:26:20 GMT<![CDATA[Reply to ISA on Mon, 07 Jul 2025 19:28:05 GMT]]>@Sunake Yes, I found this odd. But more power to Black Square to properly replicate this "quirk" then

]]>https://community.justflight.com/post/39293https://community.justflight.com/post/39293Mon, 07 Jul 2025 19:28:05 GMT<![CDATA[Reply to ISA on Mon, 07 Jul 2025 13:05:33 GMT]]>Yeah ISA on this plane isn't displayed in this plane like on most. Airbus for example will take the difference between ISA and OAT and display THAT, as ISA. In this plane it seems to display what ISA should be and you have to take the OAT (not the IOAT, which to me seems more like TAT) and that ISA value to find the correct performance table to use

]]>https://community.justflight.com/post/39269https://community.justflight.com/post/39269Mon, 07 Jul 2025 13:05:33 GMT<![CDATA[Reply to ISA on Mon, 07 Jul 2025 08:06:27 GMT]]>@ADFGVX said in ISA:

@jmarkows Yes, ISA temp is -50

So what that's saying is that the ISA standard temperature is -50C. You want the difference between OAT and ISA (if ISA shows -50C and OAT is -40C, you want the ISA+10 table for example). The tables will give you OAT and IOAT also that you can use to double check, the values should line up.

]]>https://community.justflight.com/post/39248https://community.justflight.com/post/39248Mon, 07 Jul 2025 08:06:27 GMT<![CDATA[Reply to ISA on Mon, 07 Jul 2025 06:43:46 GMT]]>@jmarkows Yes, ISA temp is -50

]]>https://community.justflight.com/post/39243https://community.justflight.com/post/39243Mon, 07 Jul 2025 06:43:46 GMT<![CDATA[Reply to ISA on Sun, 06 Jul 2025 19:17:07 GMT]]>Search for the Starship POH online. It has all the power settings in there.

]]>https://community.justflight.com/post/39194https://community.justflight.com/post/39194Sun, 06 Jul 2025 19:17:07 GMT<![CDATA[Reply to ISA on Sun, 06 Jul 2025 16:54:37 GMT]]>You mean the displayed ISA temp is -50, or your OAT is 50 below the ISA temp?

]]>https://community.justflight.com/post/39187https://community.justflight.com/post/39187Sun, 06 Jul 2025 16:54:37 GMT