In plain English
FAR 52.215-5, Facsimile Proposals, is a solicitation provision prescribed at FAR 15.209(e), most recently dated Oct 1997. 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 15.209(e), insert the following provision:
Prescribing reference: FAR 15.209(e).
The official text, verbatim
As prescribed in 15.209(e), insert the following provision:
Facsimile Proposals (Oct 1997)
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(a) Definition. "Facsimile proposal," as used in this provision, means a proposal, revision or modification of a proposal, or withdrawal of a proposal that is transmitted to and received by the Government via facsimile machine.
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(b) Offerors may submit facsimile proposals as responses to this solicitation. Facsimile proposals are subject to the same rules as paper proposals.
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(c) The telephone number of receiving facsimile equipment is:_____________ [insert telephone number].
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(d) If any portion of a facsimile proposal received by the Contracting Officer is unreadable to the degree that conformance to the essential requirements of the solicitation cannot be ascertained from the document-
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(1) The Contracting Officer immediately shall notify the offeror and permit the offeror to resubmit the proposal;
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(2) The method and time for resubmission shall be prescribed by the Contracting Officer after consultation with the offeror; and
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(3) The resubmission shall be considered as if it were received at the date and time of the original unreadable submission for the purpose of determining timeliness, provided the offeror complies with the time and format requirements for resubmission prescribed by the Contracting Officer.
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(e) The Government reserves the right to make award solely on the facsimile proposal. However, if requested to do so by the Contracting Officer, the apparently successful offeror promptly shall submit the complete original signed proposal.
(End of provision)