In plain English
FAR 52.211-11, Liquidated Damages-Supplies, Services, or Research and Development, is a contract clause prescribed at FAR 11.503(a), most recently dated Sept 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
We scanned the full clause text and found no sentence directing the contractor to insert this clause into subcontracts. That is a statement about the text, not legal advice: a prime contractor may still flow terms down contractually, an agency supplement (DFARS, VAAR, …) may add requirements, and clauses listed below (if any) may order this clause into subcontracts from the outside.
Where it's prescribed
As prescribed in 11.503(a), insert the following clause in solicitations and contracts:
Prescribing reference: FAR 11.503(a).
The official text, verbatim
As prescribed in 11.503(a), insert the following clause in solicitations and contracts:
Liquidated Damages-Supplies, Services, or Research and Development (Sept 2000)
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(a) If the Contractor fails to deliver the supplies or perform the services within the time specified in this contract, the Contractor shall, in place of actual damages, pay to the Government liquidated damages of $__________ per calendar day of delay [Contracting Officer insert amount].
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(b) If the Government terminates this contract in whole or in part under the Default-Fixed-Price Supply and Service clause, the Contractor is liable for liquidated damages accruing until the Government reasonably obtains delivery or performance of similar supplies or services. These liquidated damages are in addition to excess costs of repurchase under the Termination clause.
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(c) The Contractor will not be charged with liquidated damages when the delay in delivery or performance is beyond the control and without the fault or negligence of the Contractor as defined in the Default-Fixed-Price Supply and Service clause in this contract.
(End of clause)