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Propellers

STC SP1521SO

FAA DRS lists SP1521SO as Current · Amended, held by Northwest Propeller Services Inc., for Hamilton Standard Division 12D40 and Hamilton Standard Division 2D30. Recorded change: Install Northwest Propeller Service Counterweight Thrust Bearings in place of the Hamilton Standard Counterweight Thrust Bearings. Snapshot dated June 30, 2026.

FAA-listed holder
Northwest Propeller Services Inc.
Aircraft configurations
2
FAA revision date
FAA status
Current · Amended

Recorded modification

What the FAA record covers

SP1521SO identifies the approval, recorded holder, named aircraft, and modification scope. It does not confirm kit availability, serial-number effectivity, data rights, price, or installation authority.

Applicability

Aircraft named in FAA DRS

Named aircraft: Hamilton Standard Division 12D40 and Hamilton Standard Division 2D30. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Hamilton Standard Division 12D40P-257Hamilton Standard Division 2D30P-206

Buyer checks

Confirm before sourcing

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