Flap speeds

[cdeerinck]

Can anyone tell me if recommended Flap Speeds, as they appear in flight manuals, are Indicated (IAS) or true (TAS)?

I would assume indicated, otherwise a speed ring wouldn't be helpful, but I don't like to assume.

[Dave Nadler]

On Tuesday, June 9, 2020 at 8:46:21 PM UTC-4, cdeerinck wrote:
> Can anyone tell me if recommended Flap Speeds, as they appear
> in flight manuals, are Indicated (IAS) or true (TAS)?
>
> I would assume indicated, otherwise a speed ring wouldn't be helpful,
> but I don't like to assume.

Always indicated. As your polar.

[jfitch]

On Tuesday, June 9, 2020 at 5:46:21 PM UTC-7, cdeerinck wrote:
> Can anyone tell me if recommended Flap Speeds, as they appear in flight manuals, are Indicated (IAS) or true (TAS)?
>
> I would assume indicated, otherwise a speed ring wouldn't be helpful, but I don't like to assume.

The airplane only knows IAS. TAS means nothing to it (exception is flutter).

[cdeerinck]

Thank you very much, gentlemen.