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No. of STCs: 4

STC Holder: Northwest Propeller Inc Boeing Field Box 28 (FAA Building), Seattle, WA 98101, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SPW-2	Status: Historical	App Date:	Rev Date:
Description: Modification of Hamilton Standard4A2-V5 propeller governor to NWP-D18 on aircraft with Pratt & Whitney R-985 engines.
TC Nos.: P-891
Models: Hartzell Propeller Inc.HC-93Z
ACO: Seattle ACO Branch, Tel: +1 (206) 231-3500

STC Holder: Northwest Propeller Inc Boeing Field Box 28 (FAA Building), Seattle, WA 98101, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SPW-2	Status: Current	App Date:	Rev Date: 01/01/1960
Description: Modification of Hamilton Standard4A2-V5 propeller governor to NWP-D18 on aircraft with Pratt & Whitney R-985 engines.
TC Nos.: P-891
Models: Hartzell Propeller Inc.HC-93Z
ACO: AIR-770: West Certification Branch SEA

STC Holder: Northwest Propeller Inc Boeing Field Box 28 (FAA Building), Seattle, WA 98101, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SPW-3	Status: Historical	App Date:	Rev Date:
Description: Modification of Hamilton Standard4A2-V5 propeller governor to NWP-D18 on aircraft with Pratt & Whitney R-985 engines.
TC Nos.: P-907
Models: Hartzell Propeller Inc.HC-B3Z
ACO: Seattle ACO Branch, Tel: +1 (206) 231-3500

STC Holder: Northwest Propeller Inc Boeing Field Box 28 (FAA Building), Seattle, WA 98101, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SPW-3	Status: Current	App Date:	Rev Date: 01/01/1960
Description: Modification of Hamilton Standard4A2-V5 propeller governor to NWP-D18 on aircraft with Pratt & Whitney R-985 engines.
TC Nos.: P-907
Models: Hartzell Propeller Inc.HC-B3Z
ACO: AIR-770: West Certification Branch SEA