U.S. Department 

of Transportation 

Federal Aviation 

Administration 

MAR 2 8 2016 

FEDERAL EXPRESS 

Mr. Glenn Baxter 

Manager, C Series Airworthiness 

Bombardier Aerospace 

400 Cote-V ertu Road West 

Dorval, Quebec, H4S 1 Y9 

CANADA 

Dear Mr. Baxter: 

Transport Airplane Directorate 

1601 Lind Avenue, S.W. 

Renton, Washington 98057-3356 

We have received your petition letter dated February 18,2016, in which Bombardier 

requested a time-limited exemption from the requirements of§ 25.981(a)(3) of Title 14, 

Code of Federal Regulations (14 CFR). The exemption, if granted, would allow Bombardier 

3 years after type validation to incorporate necessary design changes to the fuel boost pump 

on Model BD-500-1A10 (CS100) and Model BD-500-1A11 (CS300) airplanes to fully 

comply with 14 CFR 25.981(a)(3). Bombardier's request was posted to the Department of 

Transportation's Federal Docket Management System (at Regulations.gov) on 

February 24,2016, and was assigned Docket No. FAA-2016-4198. 

The petition states that full compliance with§ 25.981(a)(3) will require the introduction of a 

ground fault interrupter (GFI) or a fast-acting arc fault circuit protection device. It further 

states that Bombardier is assessing and evaluating potential design solutions to incorporate 

either a GFI or a fast-acting arc fault circuit protection.device into the AC boost pump 

external electrical wiring in order to fully comply with§ 25.981(a)(3). 

We have reviewed your petition, and have determined that more information is needed 

before we can process it. In the petition, it is not clear how Bombardier plans to fully 

comply with the requirements of§ 25.981(a)(3) as it applies to the fuel pump installation; 

and it is also unclear why Bombardier needs relief from§ 25.981(a)(3) for a 3-year time 

period after FAA type validation. Therefore, Bombardier's petition should be supplemented 

to provide more substantial assurance that they will design and develop a certifiable GFI or 

fast-acting arc fault circuit protection in accordance with the requirements defined in Issue 

Paper P-32. Additionally, in order to substantiate the necessity of Bombardier's 3-year 

requirement to fully comply with§ 25.981(a)(3), the FAA requires a detailed schedule that 

includes completion dates for the design and certification of the GFI or fast-acting arc fault 

circuit protection. Furthermore, Bombardier must also provide a schedule for production 

implementation and retrofit of the existing fleet. 
Please provide the requested information within 30 days of the date of this letter, by 

submitting it to the established docket (F AA-20 16-4198). If the additional information is 

not submitted within that timeframe, we will cease work on the project with no further 

correspondence to you. Please note that our work will only resume when we receive your 

additional information, addressed to the established docket. 

2 

Bombardier requested that the action on this petition not be delayed by publication and 

comment procedures. However, Bombardier's requested relief is not identical to 

exemptions granted previously and would set a precedent. Therefore, once we have the 

additional information from Bombardier that we need, we will publish a summary of your 

petition in the Federal Register, for a 20-day comment period, in accordance with the 

requirements of§ 11.89. Please note that according to§ 11.63(d), petitioners must submit 

an exemption request 120 days before the exemption is needed to take effect. However, you 

will be advised of the agency's decision on your petition as soon as possible after the 

comment period closes. 

If you have any questions or concerns regarding your petition or the petition process, please 

contact Margaret Langsted at (425) 227-2677, or by e-mail at Margaret.Langsted@faa.gov. 

Sincerely, 

Jfl?-VJon Regimbal 

Acting Manager, Propulsion/Mechanical Systems Branch 

Transport Standards Staff 

Transport Airplane Directorate 

Aircraft Certification Service