AFS-16-0001-E

December 18, 2015

 Exemption No. 14019

 Regulatory Docket No. FAA-2000-8498

Mr. Steve Boser

Engineering Manager

Sensenich Wood Propeller Co., Inc.

2008 Wood Court

Plant City, FL 33563

Dear Mr. Boser:

This letter is to inform you that we have granted your request for exemption. It transmits our 

decision, explains its basis, and gives you the conditions and limitations of the exemption, 

including the date it ends.

The Basis for Our Decision

By letter dated July 30, 2015, you petitioned the Federal Aviation Administration (FAA) on 

behalf of Sensenich Wood Propeller Co., Inc., (Sensenich) for an exemption from § 45.11(c)

of Title 14, Code of Federal Regulations (14 CFR). That exemption, if granted, would allow

Sensenich to stamp a marking on the hub of wooden propellers instead of attaching a metal 

plate to the propeller blade.

The FAA has determined that good cause exists for not publishing a summary of the petition 

in the Federal Register because the requested exemption would not set a precedent, and any 

delay in acting on this petition would be detrimental to Pacific Prowler.

Although you requested an extension of Exemption No.9800A (copy enclosed), that 

exemption expired on October 31, 2015. Therefore, we are issuing Sensenich a new 

exemption.
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The FAA has issued a grant of exemption in circumstances similar in all material respects to 

those presented in your petition. In Grant of Exemption No. 7559 (copy enclosed), we noted

that because of the flammability properties of a solid wooden propeller, mounting a metal tag

may be the only way to provide a fireproof identification that will not be likely to be lost or

destroyed in an accident. However, attaching a metal tag presents possible safety risks for

these propellers. We agreed with the petitioner that, in accidents involving damage to wooden

propellers, the propeller hub usually remains intact, thus preserving the stamped identification.

We found that stamping the hub of the propeller with the identification marks will achieve an

equivalent level of safety to that of the rule.

Having reviewed your reasons for requesting an exemption, I find that—

 they are similar in all material respects to relief previously requested in the 

enclosed Grant of Exemption No. 7559; 

 the reasons stated by the FAA for granting the enclosed Grant of Exemption 

No. 7559 also apply to the situation you present; and 

 a grant of exemption is in the public interest. 

Additionally, on October 1, 2015, the FAA published an amendment to § 45.11(c) (80 FR 

59032) with an effective date of March 29, 2016. That amendment revised § 45.11(c) 

introductory text to read as follows: 

§ 45.11 Marking of products.

(c) Propellers and propeller blades and hubs. Each person who produces a propeller, 

propeller blade, or propeller hub under a type certificate or production certificate must 

mark each product or part. Except for a fixed-pitch wooden propeller, the marking 

must be accomplished using an approved fireproof method. 

On March 29, 2016, Sensenich will no longer need the exemption sought based on the new 

language of § 45.11(c).

Our Decision

Under the authority contained in 49 U.S.C. § 106(f), 40113, and 44701, which the FAA 

Administrator has delegated to me, I hereby grant Sensenich Wood Propeller Co., Inc., an 

exemption from § 45.11(c) to the extent necessary to allow Sensenich to stamp the hub of a 

wooden propeller with the identification mark instead of attaching a metal plate to the 

propeller blade. This exemption applies to all Sensenich wooden propellers produced under 

TCDS P–170, TC P00001NY, and TCP27NE. 
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Therefore, this exemption terminates on March 29, 2016 unless sooner superseded or 

rescinded.

Sincerely,

/s/

Dorenda D. Baker

Director, Aircraft Certification Service

Enclosure:

Exemption No. 9800A

Exemption No.7559