AD 20060606 was intended to be an interim action. Cessna has since published revisions to the AFM Supplement S1 ``Known Icing Equipment,'' which incorporates climb performance data in icing conditions. This data is to be used for preflight planning and as an inflight limitation. AD 20060606 included a limitation on autopilot use as an interim action until the development of an acceptable low speed awareness system. Cessna has issued service information introducing this system. Cessna has also developed specific training for operation of the Models 208 and 208B airplanes in icing conditions. This training is available online at: http://www.cessnaelearning.com or as part of the Cessna Winter Awareness Seminars.

If the pilot does not have enough information in the AFM or the necessary equipment to conduct safe flight into icing conditions, then loss of control could occur.

Relevant Service Information

We have reviewed Cessna Caravan Service Bulletin (SB) CAB068, dated September 18, 2006; Cessna Caravan SB CAB0611, dated October 9, 2006; and Cessna Caravan Service Kit (SK) 208171, dated October 9, 2006.

The service information includes the following:

In addition, Cessna has developed revisions to the AFM Supplement S1 ``Known Icing Equipment'' as follows:
Document Affects Revision 9 of the Model 208 (675 SHP) Cessna Model 208 airplanes with FAAapproved Flight Manual Supplement a Pratt & Whitney of Canada S1 ``Known Icing Equipment,'' Cessna Ltd., PT6A114A turboprop document D1352S109, dated August 24, engine installed (675 SHP) or 2006. FAAapproved engine of equivalent or higher horsepower installed, equipped with airframe deicing pneumatic boots, that are not currently prohibited from flight in known or forecast icing.
Revision 8 of the Model 208 (600 SHP) Cessna Model 208 airplanes with FAAapproved Flight Manual Supplement a Pratt & Whitney of Canada S1 ``Known Icing Equipment,'' Cessna Ltd., PT6A114 turboprop document D1307S108, dated August 24, engine installed (600 SHP) or 2006. FAAapproved engine of equivalent horsepower installed, equipped with airframe deicing pneumatic boots, that are not currently prohibited from flight in known or forecast icing. Revision 9 of the 208B (675 SHP) FAA Cessna Model 208B airplanes approved Flight Manual Supplement S1 with a Pratt & Whitney of ``Known Icing Equipment,'' Cessna Canada Ltd., PT6A114A document D1329S109, dated August 24, turboprop engine installed 2006. (675 SHP) or FAAapproved engine of equivalent or higher horsepower installed, equipped with airframe deicing pneumatic boots, that are not currently prohibited from flight in known or forecast icing.
Revision 9 of the 208B (600 SHP) FAA Cessna Model 208B airplanes approved Flight Manual Supplement S1 with a Pratt & Whitney of ``Known Icing Equipment,'' Cessna Canada Ltd., PT6A114 document D1309S109, dated August 24, turboprop engine installed 2006. (600 SHP) or FAAapproved engine of equivalent horsepower installed, equipped with airframe deicing pneumatic boots, that are not currently prohibited from flight in known or forecast icing.

FAA's Determination and Requirements of the Proposed AD

We are proposing this AD because we evaluated all information and determined the unsafe condition described previously is likely to exist or develop on other products of the same type design. This proposed AD would supersede AD 20060606 with a new AD that would:

Costs of Compliance

We estimate that this proposed AD would affect 765 airplanes in the U.S. registry.

We estimate the following costs to do the proposed actions: [[Page 4665]]
Total cost per Total cost on Labor cost Parts cost airplane U.S. operators 22 workhours x $80 per hour = $1,760........................ $6,440 $8,200 $6,273,000 Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency's authority.

We are issuing this rulemaking under the authority described in subtitle VII, part A, subpart III, section 44701, ``General requirements.'' Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.

Regulatory Findings

We have determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would not have a substantial direct effect on the States, on the relationship between the national Government and the States, or on the distribution of power and responsibilities among the various levels of government.

For the reasons discussed above, I certify that the proposed regulation:

1. Is not a ``significant regulatory action'' under Executive Order 12866;

2. Is not a ``significant rule'' under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and

3. Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

We prepared a regulatory evaluation of the estimated costs to comply with this proposed AD and placed it in the AD docket. Examining the AD Docket

You may examine the AD docket that contains the proposed AD, the regulatory evaluation, any comments received, and other information on the Internet at http://dms.dot.gov; or in person at the Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Office (telephone (800) 6475227) is located at the street address stated in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Safety. The Proposed Amendment

Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows: PART 39AIRWORTHINESS DIRECTIVES

1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

Sec. 39.13 [Amended]

2. The FAA amends Sec. 39.13 by removing Airworthiness Directive (AD) 20060606, Amendment 3914514, (71 FR 13533, March 16, 2006), and adding the following new AD:
Cessna Aircraft Company: Docket No. FAA200626498; Directorate Identifier 2006CE83AD.
Comments Due Date
(a) We must receive comments on this airworthiness directive (AD) action by March 5, 2007.
Affected ADs
(b) This AD supersedes AD 20060606, Amendment 3914514.
Applicability
(c) This AD applies to Models 208 and 208B, all serial numbers that are certificated in any category.
Unsafe Condition
(d) This AD results from our determination that further revisions to the Airplane Flight Manual (AFM) Supplement S1 ``Known Icing Equipment'' are necessary, and the installation of a low airspeed awareness system is required. We are issuing this AD to assure that the pilot has enough information and the necessary equipment to prevent loss of control of the airplane while inflight during icing conditions.
New Actions Required by This AD
(e) Within the next 30 days after the effective date of this AD, do the following, unless already done:
(1) For all Model 208 and 208B aircraft not currently restricted from flight into known or forecast icing: Install a low airspeed awareness system following the instructions in Cessna Service Bulletin CAB0611 and Service Kit SK 208171, both dated October 9, 2006.
(2) Incorporate the following revisions to the AFM Supplement S1 ``Known Icing Equipment'' as applicable:
Document Affects (i) Revision 9 of the Model 208 (675 Cessna Model 208 airplanes with SHP) FAAapproved Flight Manual a Pratt & Whitney of Canada Supplement S1 ``Known Icing Ltd., PT6A114A turboprop Equipment,'' Cessna document D1352S1 engine installed (675 SHP) or 09, dated August 24, 2006. FAAapproved engine of equivalent or higher horsepower installed, equipped with airframe deicing pneumatic boots, that are not currently prohibited from flight in known or forecast icing.
(ii) Revision 8 of the Model 208 (600 Cessna Model 208 airplanes with SHP) FAAapproved Flight Manual a Pratt & Whitney of Canada Supplement S1 ``Known Icing Ltd., PT6A114 turboprop Equipment,'' Cessna document D1307S1 engine installed (600 SHP) or 08, dated August 24, 2006. FAAapproved engine of equivalent horsepower installed, equipped with airframe deicing pneumatic boots, that are not currently prohibited from flight in known or forecast icing. (iii) Revision 9 of the Model 208B (675 Cessna Model 208B airplanes SHP) FAAapproved Flight Manual with a Pratt & Whitney of Supplement S1 ``Known Icing Canada Ltd., PT6A114A Equipment,'' Cessna document D1329S1 turboprop engine installed 09, dated August 24, 2006. (675 SHP) or FAAapproved engine of equivalent or higher horsepower installed, equipped with airframe deicing pneumatic boots, that are not currently prohibited from flight in known or forecast icing.
[[Page 4666]]
(iv) Revision 9 of the Model 208B (600 Cessna Model 208B airplanes SHP) FAAapproved Flight Manual with a Pratt & Whitney of Supplement S1 ``Known Icing Canada Ltd., PT6A114 Equipment,'' Cessna document D1309S1 turboprop engine installed 09, dated August 24, 2006. (600 SHP) or FAAapproved engine of equivalent horsepower installed, equipped with airframe deicing pneumatic boots, that are not currently prohibited from flight in known or forecast icing.
(3) For all Model 208 and 208B aircraft equipped with pneumatic deicing boots, and not currently restricted from flight into known or forecast icing: incorporate the following information in the Limitations Section of the Airplane Flight Manual (AFM) Supplement S1 ``Known Icing Equipment'' to require pilot training before further flight into known or forecast icing conditions. The owner/ operator holding at least a private pilot certificate as authorized by section 43.7 of the Federal Aviation Regulations (14 CFR 43.7) may insert the information into the POH specified in paragraphs (e)(3)(i) and (e)(3)(ii) of this AD. You may insert a copy of this AD into the appropriate sections of the POH to comply with this action. Make an entry into the aircraft records showing compliance with this portion of the AD in accordance with section 43.9 of the Federal Aviation Regulations (14 CFR 43.9):
(i) ``The pilotincommand must successfully complete specific training for flight into icing conditions provided by Cessna Aircraft Company within the 12 calendar months preceding any flight into known or forecast icing conditions.

Completion of either of the following courses will meet this training requirement:
Caravan Cold Wx Ops OnsiteC14694(CAC 14694)
Caravan Cold Wx Ops OnlineC14695(CAC 14695)''
(ii) ``Note: The threehour, online training course became available on October 2, 2006, at: http://www.cessnaelearning.com. The threehour onsite training courses are scheduled annually in October at various locations and provided by Cessna Aircraft Company at no cost as part of the Cessna Winter Awareness Seminars. Confirmation of pilot training completion will be maintained by Cessna Aircraft Company. Please note that all operators of the affected airplanes must initiate action to notify and ensure that flight crewmembers are aware of this requirement.''
(f) The actions in paragraphs (g) and (h) below are retained in this AD from AD 20060606. The new actions required by this AD in paragraph (e) above terminates the requirement for the actions in paragraphs (g) and (h).
(g) No later than March 27, 2006 (3 days after March 24, 2006, which is the effective date of AD 20060606), incorporate the following revisions into the Airplane Flight Manual (AFM), unless already accomplished:
Incorporate the following AFM Affected airplanes revision document (1) Cessna Model 208 airplanes and Section 2: Limitations and Model 208B airplanes, all serial Section 4: Normal Procedures: numbers. Temporary Revision 208PHTR05, dated June 27, 2005, to the POH and FAAapproved AFM. (2) Cessna Model 208 airplanes with a Section 9: Optional Systems Pratt & Whitney of Canada Ltd., PT6A Description and Operating 114A turboprop engine installed (675 Procedures: Revision 6 of the SHP) or FAAapproved engine of 208 (675 SHP) POH/FAAapproved equivalent horsepower installed, AFM Supplement S1 ``Known equipped with airframe deicing Icing Equipment,'' Cessna pneumatic boots, that are not document D1352S106, dated currently prohibited from flight in June 27, 2005.
known or forecast icing.
(3) Cessna Model 208 airplanes with a Section 9: Optional Systems Pratt & Whitney of Canada Ltd., PT6A Description and Operating 114 turboprop engine installed (600 Procedures: Revision 6 of the SHP) or FAAapproved engine of Cessna Model 208 (600 SHP) POH/ equivalent horsepower installed, FAAapproved AFM Supplement S1 equipped with airframe deicing ``Known Icing Equipment,'' pneumatic boots, that are not Cessna document D1307S106, currently prohibited from flight in dated June 27, 2005. known or forecast icing.
(4) Cessna Model 208B airplanes with a Section 9: Optional Systems Pratt & Whitney of Canada Ltd., PT6A Description and Operating 114A turboprop engine installed (675 Procedures: Revision 7 of the SHP) or FAAapproved engine of 208B (675 SHP) POH/FAA equivalent horsepower installed, approved AFM Supplement S1 equipped with airframe deicing ``Known Icing Equipment,'' pneumatic boots, that are not Cessna document D1329S107, currently prohibited from flight in dated June 27, 2005. known or forecast icing.
(5) Cessna Model 208B airplanes with a Section 9: Optional Systems Pratt & Whitney of Canada Ltd., PT6A Description and Operating 114 turboprop engine installed (600 Procedures: Revision 6 of the SHP) or FAAapproved engine of 208B (600 SHP) POH/FAA equivalent horsepower installed, approved AFM Supplement S1 equipped with airframe deicing ``Known Icing Equipment,'' pneumatic boots, that are not Cessna document D1309S106, currently prohibited from flight in dated June 27, 2005. known or forecast icing.
(h) You must do the following actions, unless already done. These changes are to the POH and FAAapproved AFM and to the POH/ FAAapproved AFM Supplement S1 ``Known Icing Equipment'' mandated in paragraph (g) of this AD:
Actions Compliance Procedures (1) For Cessna Model 208 No later than Not Applicable. airplanes and Model 208B March 27, 2006 (3
airplanes, all serial numbers, days after March
equipped with airframe deicing 24, 2006, which
pneumatic boots, that are not is the effective
currently prohibited from date of AD 2006
flight in known or forecast 0606).
icing: You are prohibited from
continued flight after
encountering moderate or
greater icing conditions. The
airplane can dispatch into
forecast areas of icing but
must exit moderate or greater
icing conditions if encountered.
[[Page 4667]]
(2) For Cessna Model 208 No later than The owner/operator airplanes and Model 208B March 27, 2006 (3 holding at least airplanes, all serial numbers, days after March a private pilot equipped with airframe deicing 24, 2006, which certificate as pneumatic boots, that are not is the effective authorized by currently prohibited from date of AD 2006 section 43.7 of flight in known or forecast 0606). the Federal icing: Aviation (i) Insert the text in Appendix Regulations (14 1 of this AD preceding the CFR 43.7) may KINDS OF OPERATION LIMITS insert the paragraph in the LIMITATIONS information into section of the Cessna Models the POH/AFM as 208 or 208B POH and FAA specified in approved AFM.. paragraph (h)(2) (ii) Insert the text in Appendix of this AD. You 2 of this AD in the LIMITATIONS may insert a copy section of the Cessna Models of this AD into 208 or 208B POH and FAA the appropriate approved AFM KNOWN ICING sections of the EQUIPMENT SUPPLEMENT S1 at the POH/AFM to comply beginning of the paragraph with this action. ``REQUIRED EQUIPMENT.''. Make an entry into the aircraft records showing compliance with portion of the AD in accordance with section 43.9 of the Federal Aviation Regulations (14 CFR 43.9). (3) For Cessna Model 208 No later than The owner/operator airplanes and Model 208B March 27, 2006 (3 holding at least airplanes, all serial numbers, days after March a private pilot equipped with airframe deicing 24, 2006, which certificate as pneumatic boots, that are not is the effective authorized by currently prohibited from date of AD 2006 section 43.7 of flight in known or forecast 0606). the Federal icing: Install 3 placards with Aviation black letters on a white Regulations (14 background. The placards shall CFR 43.7) may be located on the instrument install the panel in one of the following placards as areas: under the radio stack, specified in immediately above the pilot's paragraph (h)(3) flight instruments, or below of this AD. Make the pilot's vertical speed an entry into the indicator. Lettering on the aircraft records placard shall be a minimum showing height of \1/8\inch. compliance with (i) Placard 1 shall include the portion of the AD text of Appendix 3 of this AD.. in accordance (ii) Placard 2 shall include the with section 43.9 following text: ``120 KIAS of the Federal Minimum in Icing Flaps Up Aviation except 110 KIAS if Climbing to Regulations (14 Exit Icing.''. CFR 43.9). (iii) Placard 3 shall include
the following text:
``Disconnect autopilot at first
indication of ice accretion.''.
(4) For Cessna Model 208 No later than The owner/operator airplanes and Model 208B March 27, 2006 (3 holding at least airplanes, all serial numbers, days after March a private pilot equipped with airframe deicing 24, 2006, which certificate as pneumatic boots, that are not is the effective authorized by currently prohibited from date of AD 2006 section 43.7 of flight in known or forecast 0606). the Federal icing: Aviation (i) Insert the text in Appendix Regulations (14 4 of this AD under the CFR 43.7) may ``AIRSPEED LIMITATIONS'' insert the paragraph in the LIMITATIONS information into section of the Cessna Models the POH/AFM as 208 or 208B POH and FAA specified in approved AFM.. paragraph (h)(4) (ii) Replace the text in the of this AD. You KNOWN ICING EQUIPMENT may insert a copy SUPPLEMENT S1 under the of this AD into ``MINIMUM SPEED IN ICING the appropriate CONDITIONS'' paragraph with the sections of the text in Appendix 4.. POH/AFM to comply (iii) Insert the following text with this action. in the LIMITATIONS section of Make an entry the POH/AFM under the ``OTHER into the aircraft LIMITATIONS'' paragraph and in records showing the LIMITATIONS section of the compliance with KNOWN ICING EQUIPMENT portion of the AD SUPPLEMENT S1 under the in accordance ``AUTOPILOT OPERATION IN ICING with section 43.9 CONDITIONS'' paragraph: of the Federal ``Disconnect autopilot at first Aviation indication of ice accretion.''. Regulations (14 CFR 43.9). [[Page 4668]]
(5) For Cessna Model 208 No later than The owner/operator airplanes and Model 208B March 27, 2006 (3 holding at least airplanes, all serial numbers, days after March a private pilot equipped with airframe deicing 24, 2006, which certificate as pneumatic boots, that are not is the effective authorized by currently prohibited from date of AD 2006 section 43.7 of flight in known or forecast 0606). the Federal icing: Aviation (i) Replace the text in the Regulations (14 PERFORMANCE section of the CFR 43.7) may Cessna Models 208 or 208B POH insert the and FAAapproved AFM KNOWN information into ICING EQUIPMENT SUPPLEMENT S1 the POH/AFM as under the ``STALL SPEEDS'' specified in paragraph with the text in paragraph (h)(5) Appendix 5.. of this AD. You (ii) Replace the ``WARNING'' may insert a copy text in the LIMITATIONS section of this AD into of the Cessna Models 208 or the appropriate 208B POH and FAAapproved AFM sections of the KNOWN ICING EQUIPMENT POH/AFM to comply SUPPLEMENT S1 under with this action. ``ENVIRONMENTAL CONDITIONS'' Make an entry with: ``FLIGHT IN THESE into the aircraft CONDITIONS ARE PROHIBITED.''. records showing (iii) Replace the last two compliance with sentences in the LIMITATIONS portion of the AD section of the Cessna Models in accordance 208 or 208B POH and FAA with section 43.9 approved AFM KNOWN ICING of the Federal EQUIPMENT SUPPLEMENT S1 under Aviation ``ENVIRONMENTAL CONDITIONS'' Regulations (14 with the following text: ``Exit CFR 43.9). strategies should be determined
during preflight planning.''.
Alternative Methods of Compliance (AMOCs)
(i) The Manager Wichita Aircraft Certification Office (ACO), FAA, ATTN: Robert P. Busto, Aerospace Engineer, Wichita Aircraft Certification Office, FAA, 1801 Airport Road, Wichita, Kansas 67209; telephone: (316) 9464157; fax: (316) 9464107, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19.
Related Information
(j) To get copies of the service information referenced in this AD, contact: The Cessna Aircraft Company, Product Support, P.O. Box 7706, Wichita, Kansas 67277. To view the AD docket, go to the Docket Management Facility; U.S. Department of Transportation, 400 Seventh Street, SW., Nassif Building, Room PL401, Washington, DC, or on the Internet at http://dms.dot.gov. The docket number is Docket No. FAA 200626498; Directorate Identifier 2006CE83AD.
Appendix 1 Retained From AD 20060606
Changes to the Cessna Models 208 or 208B Pilot's Operating Handbook (POH) and FAAApproved Airplane Flight Manual (AFM)

Affected Cessna Models 208 or 208B POH and FAAApproved AFM

Insert the following text at the beginning of the KINDS OF OPERATION LIMITS paragraph in the LIMITATIONS section of the Cessna Models 208 or 208B POH and FAAapproved AFM. This may be done by inserting a copy of this AD into the POH/AFM:
``Continued flight after encountering moderate or greater icing conditions is prohibited. One or more of the following defines moderate icing conditions for this airplane:

Indicated airspeed in level cruise flight at constant power decreases by 20 knots. Engine torque required to maintain airspeed increases by 400 ft. lbs. Airspeed of 120 KIAS cannot be maintained in level flight. An accretion of \1/4\inch of ice is observed on the wing strut.

Disregard any mention of approval for flight in icing conditions within the POH/AFM.''
Appendix 2 Retained From AD 20060606
Changes to the Cessna Models 208 or 208B Pilot's Operating Handbook (POH) and FAAApproved Airplane Flight Manual (AFM)

Affected Cessna Models 208 or 208B POH and FAAApproved AFM

Insert the following text in the LIMITATIONS section of the POH and FAAapproved AFM KNOWN ICING EQUIPMENT SUPPLEMENT S1, at the beginning of the paragraph ``REQUIRED EQUIPMENT.'' This may be done by inserting a copy of this AD into the POH/AFM:
``Continued flight after encountering moderate or greater icing conditions is prohibited. One or more of the following defines moderate icing conditions for this airplane:

Indicated airspeed in level flight at constant power decreases by 20 knots. Engine torque required to maintain airspeed increases by 400 ft. lbs. Airspeed of 120 KIAS cannot be maintained in level flight. An accretion of \1/4\inch of ice is observed on the wing strut.

Disregard any mention of approval for flight in icing conditions within the POH/AFM.''
Appendix 3 Retained From AD 20060606
Cessna Model 208 Airplanes and Model 208B Airplanes, Equipped With Airframe Deicing Pneumatic Boots, That Are Not Currently Prohibited From Flight in Known or Forecast Icing

Install a placard with black letters on a white background. The placard shall be located on the instrument panel in one of the following areas: Under the radio stack, immediately above the pilot's flight instruments, or below the pilot's vertical speed indicator. Lettering on the placard shall be a minimum \1/8\inch tall and state the following:
``Continued flight after encountering moderate or greater icing conditions is prohibited. One or more of the following defines moderate icing conditions for this airplane:

Airspeed in level flight at constant power decreases by 20 KIAS. Engine torque required to maintain airspeed increases by 400 ft. lbs. 120 KIAS cannot be maintained in level flight.

Ice accretion of \1/4\ inch observed on the wing strut.'' Appendix 4 Retained From AD 20060606
Changes to the Cessna Models 208 or 208B Pilot's Operating Handbook (POH) and FAAApproved Airplane Flight Manual (AFM) Supplement S1 Affected Cessna Models 208 or 208B POH and FAAApproved AFM and FAAApproved Supplement S1

Insert the following text into the LIMITATIONS section under the ``AIRSPEED LIMITATIONS'' paragraph of the Cessna
[[Page 4669]]
Models 208 or 208B POH and FAAapproved AFM, and replace the text in the KNOWN ICING EQUIPMENT SUPPLEMENT S1 under the ``MINIMUM SPEED IN ICING CONDITIONS'' paragraph with the following text. This may be done by inserting a copy of this AD into the POH/AFM:
``Minimum airspeed in icing conditions, for all flight phases including approach, except takeoff and landing:
Flaps up: 120 KIAS
Flaps 10[deg]: 105 KIAS

Flaps 20[deg]: 95 KIAS

Exception for flaps up: when climbing to exit icing conditions airspeed can be reduced to 110 KIAS minimum.

Flaps must be extended during all phases (takeoff and landing included) at airspeeds below 110 KIAS, except adhere to published AFM procedures when operating with ground deicing/antiicing fluid applied.

WARNING

The aural stall warning system does not function properly in all icing conditions and should not be relied upon to provide adequate stall warning when in icing conditions.''

Note: These are minimum speeds for operations in icing conditions. Disregard any reference to the original speeds within the POH/AFM.
Appendix 5 Retained From AD 20060606
Changes to the Cessna Models 208 or 208B Pilot's Operating Handbook (POH) and FAAApproved Airplane Flight Manual (AFM) Supplement S1

Replace the text in the PERFORMANCE section of the POH/AFM KNOWN ICING EQUIPMENT SUPPLEMENT S1 under the ``STALL SPEEDS'' paragraph with the following text:
``Ice accumulation on the airframe may result in a 20 KIAS increase in stall speed. Either buffet or aural stall warning should be treated as an imminent stall.''
``WARNINGThe aural stall warning system does not function properly in all icing conditions and should not be relied upon to provide adequate stall warning when in icing conditions.''

Issued in Kansas City, Missouri, on January 25, 2007. Kim Smith,
Manager, Small Airplane Directorate, Aircraft Certification Service. [FR Doc. E71604 Filed 13107; 8:45 am]
BILLING CODE 491013P

FOR FURTHER INFORMATION CONTACT Robert P. Busto, Aerospace Engineer, Wichita Aircraft Certification Office, FAA, 1801 Airport Road, Wichita, Kansas 67209; telephone: (316) 9464157; fax: (316) 9464107.