In plain English
FAR 52.225-17, Evaluation of Foreign Currency Offers, is a solicitation provision prescribed at FAR 25.110, most recently dated Feb 2000. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
This is a solicitation provision — it applies to offerors when submitting an offer, not to contract performance, so subcontract flowdown is generally not the operative question for it.
Where it's prescribed
As prescribed in 25.1103 (c)(, insert the following provision:
Prescribing reference: FAR 25.110.
The official text, verbatim
As prescribed in 25.1103 (c)(, insert the following provision:
Evaluation of Foreign Currency Offers (Feb 2000)
If the Government receives offers in more than one currency, the Government will evaluate offers by converting the foreign currency to United States currency using [Contracting Officer to insert source of rate] in effect as follows:
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(a) For acquisitions conducted using sealed bidding procedures, on the date of bid opening.
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(b) For acquisitions conducted using negotiation procedures-
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(1) On the date specified for receipt of offers, if award is based on initial offers; otherwise
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(2) On the date specified for receipt of proposal revisions.
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(End of provision)