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Engine and powerplant

STC SA5491NM

FAA DRS lists SA5491NM as Current · Reissued, held by Horizon Instruments Inc, for Raytheon Aircraft 35-33, Raytheon Aircraft 35-A33, and Raytheon Aircraft 35-B33, and 23 more aircraft configurations. Recorded change: Installation of engine electronic digital tachometer. Snapshot dated June 30, 2026.

FAA-listed holder
Horizon Instruments Inc
Aircraft configurations
26
FAA revision date
FAA status
Current · Reissued

Recorded modification

What the FAA record covers

Installation of engine electronic digital tachometer.

SA5491NM 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: Raytheon Aircraft 35-33, Raytheon Aircraft 35-A33, and Raytheon Aircraft 35-B33, and 23 more aircraft configurations. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Raytheon Aircraft 35-333A15Raytheon Aircraft 35-A333A15Raytheon Aircraft 35-B333A15Raytheon Aircraft 35-C333A15Raytheon Aircraft 35-C33A3A15Raytheon Aircraft 363A15Raytheon Aircraft A363A15Raytheon Aircraft A36TC3A15Raytheon Aircraft B36TC3A15Raytheon Aircraft E333A15Raytheon Aircraft E33A3A15Raytheon Aircraft E33C3A15Raytheon Aircraft F333A15Raytheon Aircraft F33A3A15Raytheon Aircraft F33C3A15Raytheon Aircraft G333A15Raytheon Aircraft H353A15Raytheon Aircraft J353A15Raytheon Aircraft K353A15Raytheon Aircraft M353A15Raytheon Aircraft N353A15Raytheon Aircraft P353A15Raytheon Aircraft S353A15Raytheon Aircraft V353A15Raytheon Aircraft V35A3A15Raytheon Aircraft V35B3A15

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Raytheon Aircraft 35-33 and Raytheon Aircraft 35-A33, and 24 more aircraft configurations model, serial range, and configuration?
  2. 02Which powerplant configuration, limits, instruments, and maintenance data apply?
  3. 03Who can legally supply the design data, kit, instructions, and ICAs?
  4. 04What parts, labor, conformity, and return-to-service work are excluded?

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