From:

To: Cc: Date: Subject:

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

RobertHettmanlANWFAA@FM TinaMilier/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 foryour support on this item. Ifyou need anything else please letme 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 IfCessna did not actually lntend to request an exemption to 25.841(b) (6) I then Ineed confirmation from Cessna to that effect. W1th ane-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 anexemption to 25.841, or for us to also evaluate the request for 25.841. Just so I'm clear IsCessna requesting an exemption to 25.841 (b)(6) inaddition to 25_1447 (c) (1)? Thanks, Bob HettmanFAA_-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 11:58AM

RE: exemption request

Thank you Bob. Cessna will revise the ELOS and leave the exemption as is. I Thanks for your help. Ifyou 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 wewould evaluate it either way. Without doing more research, Idon't see that we have granted an exemption to 25.841 (b)(6)before for high altitude operations. Typically this 

### is accomplished with anequivalent safety finding, such as what wasaccomplished inmemo 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, BobHettman FAA -Transport Airplane Directorate Propulsion andMechanical 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 10:36AM

RE: exemption request

Cessna needs your guidance. Ibelieve we have two options. 1. Revise the exemption request to the information attached (InBold). 2. Revise the ELOS.Because of time constraints, Cessna would like topropose a revision to

the exemption request and send back toyou. Doyou agree with our proposal or is there another route we should cake. Looking forward toyour 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, Ido have aquestion. Inthe exemption request, at the top of page 2of 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) lSbelng requested, but the cabin warning statement was a little confusing because I the change incabin warning for high elevation operations is typically , addressed with anequivalent safety finding to 25.841 (b)(6). IsCessna actually requesting an exemption for the cabin warning requirements in 25.841 (b)(6)aswell as the mask deployment requirements in 25.1447(c) (I)? Thanks, Bob Hettman FAA -Transport Airplane Directorate propulsion andMechanical Systems Phone: 425-227-2683 Fax: 425-227-1149From: "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 Subject: 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 letme 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 apetition for exemption, letter I L390-10-0656, but it didnot

have areturn mailing address. Idon't have anyquestions about your request, but could you please provide a return mailing address. Thanks, Bob Hettman FAA -Transport Airplane Directorate Propulsion andMechanical Systems Phone: 425-227-2683 Fax: 425-227-1149

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