From:

To:

Cc:

Date:

Subject:

Ro

Bob,

"DeBuhr, Donna" <DDeBuhr@cessna.textron.com>

Robert HettmanlANWFAA@FM

Tina Milier/ACElFM@FAA

04/15/201007:49 AM

RE: exemption request

since TAD relayed the inability to approve an exemption to

25.841(b} (6)without going through the entire proces~, the plan is to go

back to the original exemption submittal (25.1447 (cj (1) only).

CFR 25.841(b) (6) will be addressed in the ELOS revition.

Again, thank you for your support on this item.

If you need anything else please let me know.

Donna DeBuhr

Engineering Specialist

Model 680, Sovereign

Cessna Aircraft Company

Phone: 316-517-0689

FAX: 316-206-4073

-----Original Message-----

From: Robert.Hettman@faa.gov [mailto:Robert.Hettman@faa.gov]

Sent: wednesday, April 14, 2010 2:51 PM

To: DeBuhr, Donna

Subject: RE: exemption request

Donna

The exemption request "as is" was for BOTH 25.841(b (6) and

25.1447 (c) (1). I

If Cessna did not actually lntend to request an exemption to

25.841(b) (6) I

then I need confirmation from Cessna to that effect. W1th an e-mail, I

can put a summary in the docket and move along as if the original

exemption

request was only for 25.1447(c) (1). The other options are for Cessna to

re-suomit the request and remove the portion requesting an exemption to

25.841, or for us to also evaluate the request for 25.841.

Just so I'm clear

Is Cessna requesting an exemption to 25.841 (b) (6) in addition to 25 _1447

(c) (1) ?

Thanks,

Bob Hettman
FAA_ - Transport Airplane Directorate

propulsion and Mechanical Systems

Phone: 425-227-2683

Fax: 425-227-1149

From:

To:

Date:

Subject:

"DeBuhr, Donna" <DDeBuhr@cessna.textron.com>

Robert Hettman/ANM/FAA@FAA

04/14/2010 11:58 AM

RE: exemption request

Thank you Bob. Cessna will revise the ELOS and leave the exemption as

is.

I

Thanks for your help. If you need anything please let me know.

Donna DeBuhr

-----Original Message-----

From: Robert.Hettman@faa.gov [mailto:Robert.Hettman@faa.gov]

Sent: Wednesday, April 14, 2010 1:37 PM

To: DeBuhr, Donna

Cc: Tina.Miller@faa.gov

Subject: P£: exemption request

Donna

I can't really suggest which way to go since we would evaluate it either

way.

Without doing more research, I don't see that we have granted an

exemption

to 25.841 (b) (6) before for high altitude operations. Typically this is

accomplished with an equivalent safety finding, such as what was
accomplished in memo TC2548WI-T-SG-I. On the other hand, exemptions to

the

mask drop altitude portion of 25.1447(cl (1) for high altitude operations

have been considered much more readily and often do not go out for

public

comment anymore because there have been multiple exemptions granted for

the

same subject.

Thanks,

Bob Hettman

FAA - Transport Airplane Directorate

Propulsion and Mechanical Systems

Phone: 425-227-2683

Fax: 425-227-1149

From:

To:

Cc:

Date:

Subject:

Dear Bob,

"DeBuhr, Donna" <DDeBuhr@cessna.textron.com:>

Robert Hettman/ANM/FAA@FAA

Tina Miller/ACE/FAA@FAA

04/14/2010 10:36 AM

RE: exemption request

Cessna needs your guidance. I believe we have two options.

1. Revise the exemption request to the information attached (In Bold).

2. Revise the ELOS.
Because of time constraints, Cessna would like to propose a revision to

the exemption request and send back to you.

Do you agree with our proposal or is there another route we should cake.

Looking forward to your response.

Thanks,

Donna DeBuhr

Engineering Specialist

Model 680, sovereign

Cessna Aircraft Company

Phone· 316-517-0689

FAX: 316-206-4073

-----Original Message-----

From: Robert.Hettman@faa.gov [mailto:Robert.Hettman@faa.govl

Sent: Wednesday, April 07, 2010 5:16 PM

To: DeBuhr, Donna

Cc: Tina.Miller@faa.gov

Subject: RE: exemption request

Thank you for the address.

After looking at this a little closer, I do have a question.

In the exemption request, at the top of page 2 of 3, it is stated that

an

exempcion is requested to allow use of a ";:.14K"switch to shift the

cabin

altitude warning to 15,750 feet.

The remainder of the exemption request implies that an exemption for

only

• I • ,

the mask deployment altitude requirement In 25.1447(c) (1) lS belng

requested, but the cabin warning statement was a little confusing

because I

the change in cabin warning for high elevation operations is typically ,

addressed with an equivalent safety finding to 25.841 (b) (6) .

Is Cessna actually requesting an exemption for the cabin warning

requirements in 25.841 (b) (6) as well as the mask deployment requirements

in

25.1447(c) (I)?

Thanks,

Bob Hettman

FAA - Transport Airplane Directorate

propulsion and Mechanical Systems

Phone: 425-227-2683

Fax: 425-227-1149
From: "DeBuhr, Donna II <DDeBuhr@cessna. textron. com>

To: Robert Hettman/ANM/FAA@FAA

Cc: Tina Miller/ACE/FAA@FAA

Date: 04/07/2010 01:58 PM

Subj ect: RE: mailing address

Dear Bob,

Below is the requested Cessna Address.

Cessna Aircraft Company

One Cessna Boulevard,

P.O. Box 7704,

Wichita, Kansas 67277-7704

If you need anything else please let me know.

Donna DeBuhr

Engineering specialist

Model 680, Sovereign

Cessna Aircraft Company

Phone: 316-517-0689

FAX: 316-206-4073

-----Original Message-----

From: Robert.Hettman@faa.gov [mailto:Robert.Hettman@faa.gov]

Sent: Wednesday, April 07, 2010 10:38 AM

To: DeBuhr, Donna

Subject: mailing address

Donna

We received a petition for exemption, letter

I

L390-10-0656, but it did
not

have a return mailing address.

I don't have any questions about your request, but could you please

provide

a return mailing address.

Thanks,

Bob Hettman

FAA - Transport Airplane Directorate

Propulsion and Mechanical Systems

Phone: 425-227-2683

Fax: 425-227-1149

[attachment "25.841 Exemption Update.doc" deleted by Robert

Hettman/ANM/FAA]