AFS-15-094-E

December 31, 2014

 Exemption No. 11137

 Regulatory Docket No. FAA-2014-0883

Mr. Timothy F. Rounds

Assistant Director of Maintenance

Ace Aviation Services, Corporation

5525 NW 15th Ave., Suite 150

Fort Lauderdale Executive Airport

Fort Lauderdale, FL 33309

Dear Mr. Rounds:

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 September 11, 2014, you petitioned the Federal Aviation Administration 

(FAA) on behalf of Ace Aviation Services Corporation (Ace Aviation Services), for an 

exemption from § 135.152, Appendix F, parameter No. 5 (Normal Acceleration, Vertical) of 

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

CL-600-2B16 (CL-604 Variant), N601GT, S/N 5524 and N203, S/N 5374 airplanes to 

continue to operate without complying with the required flight recorder data sampling rates of 

14 CFR § 135.152, Appendix F. While the petition requests relief from Appendix F 

requirements, relief is actually required from 14 CFR § 135.152, which requires compliance 

with Appendix F. The FAA has considered the petition as requesting relief from the 14 CFR 

§ 135.152 requirements.

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 Ace Aviation Services.

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. 11052 (copy enclosed), the FAA 
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found that good cause exists to allow time for the airplane manufacturer to complete 

development of a modification to retrofit the subject aircraft with a redesigned data 

concentrator unit (DCU) capable of providing the normal acceleration parameter information 

to the Digital Flight Data Recorder (DFDR) system to meet Appendix F requirements, and for 

the operators to modify their aircraft accordingly. The FAA does not agree with any assertion 

that flight recorder systems are not safety equipment simply because they do not affect the 

operation of a given flight. Flight recorder data are often the only evidence of airplane

problems available to investigators following aircraft accidents and incidents. However, 

because the subject airplanes will still be recording flight data and the limitations are known, 

the FAA agrees that a limited time to complete the upgrades is appropriate.

The FAA finds that since the problem identified in this petition is a system design issue over 

which CL604 operators have no control or ability to fix, and that since the deficiency would 

be known to accident investigators and can be compensated for in any necessary analysis, it is 

in the public interest to allow continued operation of a limited number of airplanes until the 

modifications can be incorporated.

The FAA has analyzed the petitioner’s request to operate outside the United States using this 

exemption to examine any effect on U.S. obligations under international agreements. The 

FAA finds that even with the exemption, the DFDR system installation on the subject 

airplanes meets or exceeds the recorder requirements of both Annex 6 of the International 

Civil Aviation Organization and the regulations of the European Aviation Safety Agency. 

Accordingly, the petitioner is permitted to operate the listed airplanes outside of the United 

States under the conditions and limitations listed in this exemption.

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. 11052;

 the reasons stated by the FAA for granting the enclosed Grant of Exemption No. 11052

also apply to the situation you present; and

 for the reasons stated in Grant of Exemption No. 11052, a grant of exemption is in the 

public interest.

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 Ace Aviation Services an exemption from 

14 CFR § 135.152 to the extent necessary to allow the listed airplanes to operate without 

complying with the Normal Acceleration (Vertical) data recording rate requirement listed in 

Appendix F to Part 135, subject to the conditions and limitations listed herein.
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Conditions and Limitations 

1. This exemption applies only to the following airplanes while it remains on the part 135 

operations specifications of Ace Aviation Services: CL-600-2B16, N601GT, S/N 5524 

and N203, S/N 5374.

2. This exemption allows for the continued operation of the affected airplanes with a DFDR 

that receives data from the source sensor for the Normal Acceleration (Vertical) parameter 

at a rate of 0.2 rather than the 0.125 as required by 14 CFR Appendix F to part 135. No 

other relief from any other parameter requirement or other flight data recorder provision 

of 14 CFR part 135 is granted by this exemption.

3. Ace Aviation Services must establish a firm schedule for accomplishment of the 

modifications required to bring the subject airplanes into compliance and submit the 

schedule to its oversight office. The schedule must include the following milestones:

a. Bombardier service bulletin issued no later than September 30, 2015;

b. Ace Aviation Services plan for incorporation of the service bulletin on the subject 

airplanes, to be submitted to its Principal Avionics Inspector or other cognizant 

oversight office no later than December 1, 2015. The plan must include a 

modification date within the term of this exemption for the airplanes listed in 

condition 1 above;

c. Starting December 1, 2015, Ace Aviation Services must provide monthly status 

reports to its oversight office outlining the completion of the aircraft modifications 

necessary to bring its aircraft into compliance with the requirements of 14 CFR 

§ 135.152.

4. Noncompliance with any term of these conditions and limitations terminates this 

exemption without further action by the FAA. 

5. Use of this exemption is limited to Ace Aviation Services while the subject airplanes

remain on its Part 135 operations specifications. This exemption may not be transferred to 

any subsequent operator of the affected airplanes. Subsequent operators of the affected 

airplanes must apply for and be granted an exemption in writing before such airplanes

may be operated if the airplanes have not been modified to comply with 14 CFR 

§ 135.152. 

6. A copy of this exemption must be retained with the operator's DFDR correlation 

documentation as specified in the applicable provisions of 14 CFR § 135.152 until the

airplanes identified in this exemption have been modified. 
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7. In the event of an accident or incident after which the DFDR recording media must be 

removed and retained subject to 14 CFR § 135.152(e), the operator must provide a copy of 

this exemption together with the recording media when submitted. 

8. This exemption may be used for operations outside the United States.

This exemption terminates on the sooner of the completion of the modification described in 

this exemption that brings the airplanes into compliance with 14 CFR § 135.152, or on 

January 31, 2017, unless sooner superseded, rescinded, or terminated.

Sincerely,

/s/

John S. Duncan

Director, Flight Standard Service 

Enclosure 

Exemption No. 11052