January 5, 2011 

 Exemption No. 10189 

 Regulatory Docket No. FAA-2010-1120 

Mr. Jim F. Buehring 

Chelton Avionics, Inc., 

 dba Wulfsberg Electronics Division 

6400 Wilkinson Drive 

Prescott, AZ 86301 

CORRECTED COPY 

The FAA is reissuing Exemption No. 10189 to correct an error. The name “Wolfsburg” 

has been corrected to read “Wulfsberg” and “Wulfsberg Elections Division” corrected to 

read “Wulfsberg Electronics Division”. Please file this with the original signed 

Exemption. 

Dear Mr. Buehring: 

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 October 5, 2010, you petitioned the Federal Aviation Administration 

(FAA) on behalf of Chelton Avionics, Inc., doing business as Wulfsberg Electronics 

Division (Wulfsberg), for an exemption from § 21.621 of Title 14, Code of Federal 

Regulations (14 CFR) to the extent necessary to allow Wulfsberg to continue production 

and support of Technical Standard Order (TSO) approved articles made by Northern 

Airborne Technology Ltd. located in Kelowna, Canada. Wulfsberg has acquired all 

assets of Northern Airborne Technology Ltd. Northern Airborne Technology Ltd., will 

be closed and will cease to exist as a legal entity. 

A previous exemption (Exemption No. 10081) transferred the approval of some of the 

articles produced under a letter of TSO design approval by Northern Airborne 

Technology Ltd. to Wulfsberg. The current exemption requests the transfer of the 

remaining articles produced by Northern Airborne Technology Ltd. to Wulfsberg. 

AIR-11-035-E 
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 Wulfsberg. 

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. 10081, the FAA found 

that regulation from which Wulfsberg seeks relief was intended to prevent the sale or 

purchase of production approvals by preventing the legal transfer of certificate 

ownership. The rule does not intend to prevent one company from buying another, or 

from one company assuming majority ownership of another. Under these circumstances, 

safeguards have been established outlining the requirements for acquiring and 

maintaining production approval. 

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

 they don’t differ materially from those presented by the petitioner in the enclosed 

grant of exemption; 

 the reasons stated by the FAA for granting the enclosed exemption also apply to the 

situation you present; and 

 a grant of exemption is in the public interest. 

Our Decision 

Under the authority contained in 49 U.S.C. 40113 and 44701, which the FAA 

Administrator has delegated to me, I hereby grant Chelton Avionics, Inc., doing business 

as Wulfsberg Electronics Division, an exemption from 14 CFR § 21.621 to the extent 

necessary to allow Wulfsberg to continue production and support of TSO products 

currently produced by Northern Airborne Technology Ltd., located in Kelowna, Canada, 

subject to the conditions and limitations described below. 

Conditions and Limitations 

Wulfsberg is fully responsible for continued airworthiness responsibilities, including 

compliance with 14 CFR § 21.3, for all articles previously manufactured by Northern 

Airborne Technology Ltd. that are transferred to Wulfsberg under this exemption. 

Once TSO authorizations are issued to Wulfsberg under 14 CFR § 21.605, Northern 

Airborne Technology Ltd. may no longer produce the following models under the TSO 

letter of design approval issued under 14 CFR § 21.617. 

NAT Kelowna Model Description Applicable TSO(s) 

903-5223-901 RVR-223, NVIS A, CVR Controller C123a 

903-5223-902 RVR-223, NVIS B, CVR Controller C123a 

907-1102-122 RGT-102 EGPWS Control Panel, 

OVRD/INOP 

C92c 

907-1102-X22 RGT-102 EGPWS Control Panel, 

OVRD/INOP 

C92c 

AA20-431 Cabin PA System C50c

AA21-4XX PA/Siren Controller C50c
AA30-3XX Custom Switch Panel C139

AA38-3XX Local ICS Loop, 8 place C50c

AMS43 TSO Single Channel Audio Controller 

TSO 

C50c 

AA85-001 InterVOX II intercom system, 4/6 

Place, Mono 

C50c

AA95-XXX TSO Single Channel Audio Controller C50c

Once TSO authorizations are issued to Wulfsberg under 14 CFR § 21.605, Northern 

Airborne Technology Ltd. must formally inform Transport Canada the corresponding 

letters of TSO design approval are withdrawn by the FAA.

Prior to commencing production of the transferred articles, Wulfsberg's production and 

quality system must be re-inspected and approved by the applicable FAA Manufacturing 

Inspection District Office (MIDO). 

Sincerely, 

/s/ 

Frank P. Paskiewicz 

Acting Director, Aircraft Certification Service 

Enclosure