FR Doc E7-9398

[Federal Register: May 17, 2007 (Volume 72, Number 95)]
[Rules and Regulations]
[Page 27725-27730]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr17my07-3]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2006-26498; Directorate Identifier 2006-CE-83-AD;
Amendment 39-15056; AD 2007-10-15]
RIN 2120-AA64

Airworthiness Directives; Cessna Aircraft Company Models 208 and
208B Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: The FAA is adopting a new airworthiness directive (AD) to
supersede AD 2006-06-06, which applies to certain Cessna Aircraft
Company (Cessna) Models 208 and 208B airplanes. AD 2006-06-06 currently
requires you to incorporate information into the applicable section of
the Airplane Flight Manual (AFM) and Pilot's Operating Handbook (POH)
and requires you to install placards. Since we issued AD 2006-06-06,
Cessna issued new S1 Known Icing Equipment AFM supplements and
developed a low airspeed awareness system. Consequently, this AD
requires you to incorporate the applicable AFM supplement revision and
temporarily retain the requirements of AD 2006-06-06 until the above
revisions are incorporated. One of the AFM requirements is the
installation of a functional low airspeed awareness system to operate
the airplane in known icing conditions. 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 in-flight
during icing conditions.

[[Page 27726]]

DATES: This AD becomes effective on June 21, 2007.

ADDRESSES: To get the service information identified 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 PL-401, Washington, DC 20590-001 or on the Internet at http://dms.dot.gov.
The docket number FAA-2006-26498; Directorate Identifier

2006-CE-83-AD.

FOR FURTHER INFORMATION CONTACT: Robert P. Busto, Aerospace Engineer,
Wichita Aircraft Certification Office, FAA, 1801 Airport Road, Wichita,
Kansas 67209; telephone: (316) 946-4157; fax: (316) 946-4107.

SUPPLEMENTARY INFORMATION:

Discussion

On January 25, 2007, we issued a proposal to amend part 39 of the
Federal Aviation Regulations (14 CFR part 39) to include an AD that
would apply to Cessna Models 208 and 208B airplanes. This proposal was
published in the Federal Register as a notice of proposed rulemaking
(NPRM) on February 1, 2007 (FR 72 4663). The NPRM proposed to supersede
AD 2006-06-06, which currently requires you to incorporate information
into the applicable section of the Airplane Flight Manual (AFM) and
Pilot's Operating Handbook (POH) and requires you to install placards.
The NPRM would require you to incorporate new S1 Known Icing Equipment
AFM supplements and to install a low airspeed awareness system.

Comments

We provided the public the opportunity to participate in developing
this AD. The following presents the comments received on the proposal
and FAA's response to each comment. As policy, we do not address
anonymous comments.

Comment Issue No. 1: Provide More Time for Installation of the Low
Airspeed Awareness System

Corporate Air, the Regional Air Cargo Carriers Association (RACCA),
and Federal Express request an extension to the compliance time for
installing the low airspeed awareness system. The NPRM proposes a
compliance time of 30 days, and the commenters want an extension until
September 2007 in order to prevent unnecessary grounding of their
airplanes. The commenters state that this should not present a safety
problem since the icing season does not start until the end of
September or early October.
The FAA concurs that the compliance time for the low airspeed
awareness system can be extended and will increase it from 30 days to
90 days after the effective date of the AD. Cessna has issued new S1
Known Icing Equipment AFM supplements, dated February 20, 2007. These
supplements incorporate all the actions from the NPRM, including the
requirement for the installation of a functional low airspeed awareness
system when flying into known icing conditions.
We are changing the final rule to require the incorporation of the
applicable S1 Known Icing Equipment AFM supplement, dated February 20,
2007, and to extend the compliance time from 30 days to 90 days after
the effective date of the AD.

Comment Issue No. 2: Do Not Retain the Actions From AD 2006-06-06

RACCA believes that there is no need for the FAA to restate the
actions of AD 2006-06-06 in the AD. The commenter states that as soon
as the new AD becomes effective, the actions of AD 2006-06-06 are
superseded and are no longer necessary.
We concur that, as of the effective date of the new AD, the actions
of AD 2006-06-06 are superseded. However, we are allowing 90 days after
the effective date of this AD before the new actions must be
incorporated. It is essential to address the unsafe condition and
assure that the actions of AD 2006-06-06 remain in effect until the
actions required by the new AD are incorporated.
We have not made changes to the final rule based on this comment.

Comment Issue No. 3: Clarify Whether Alternative Methods of Compliance
(AMOC) Approved per AD 2006-06-06 Are Retained for This AD

Since the FAA is retaining the actions of AD 2006-06-06 until the
new actions are done, RACCA questions whether it is the FAA's intent to
allow the AMOCs approved for AD 2006-06-06.
It is the FAA's intent to retain the AMOCs approved for AD 2006-06-
06 during the 90-day compliance period until the new actions are
required.
We are changing the final rule to state that AMOCs approved for AD
2006-06-06 are approved for this AD until the actions required by
paragraph (e) of this AD are done.

Comment Issue No. 4: Concern About the Reliability and Accuracy of the
Low Airspeed Awareness Alert System

Corporate Air expresses concern about the reliability and accuracy
of the low airspeed awareness alert system. The commenter did not
request a specific change other than the change in compliance time
referenced previously. We infer that the commenter either wants the
requirement taken out of the AD or the AD delayed until further
research can be done.
The FAA and Cessna conducted flight tests of the low airspeed
awareness system during certification where the system passed all
certification tests and was found acceptable. The system was designed
to meet reliability certification requirements. We have determined that
a functional low airspeed awareness system is necessary for the Cessna
Models 208 and 208B to safely operate in known icing conditions.
We have not made changes to the final rule based on this comment.

Comment Issue No. 5: Require Equipment Other Than the Low Airspeed
Awareness System

Stephen McClure believes that there will not be any benefit in
safety from the installation of the low airspeed awareness system,
because the airplane airspeed indicators already fill the need. He
feels that pilots need to be trained to avoid and/or exit icing
conditions once encountered. As an alternative, the commenter believes
a better wing ice detection light system, automatic boot cycling
system, and Goodrich ice detection system would provide a better safety
benefit than the low airspeed awareness system.
We do not agree that the low airspeed awareness system is not
necessary and have determined that it is necessary for flight in known
icing conditions. The accident/incident history of the Model 208
indicates that pilots have not been diligent in the management of the
aircraft when operating in icing conditions, as aircraft performance
can decay very quickly. Additionally, the accident that occurred in
Moscow in 2006 and recent flight tests have shown that the aural stall
warning system does not provide sufficient time before a stall in all
icing conditions. The low airspeed awareness system addresses each of
these concerns by providing an alert with sufficient time to allow
pilots to take the proper corrective action. The commenter is correct
in stating that training pilots to avoid and/or exit icing conditions
is a prudent course of action. Cessna has issued new S1 Known Icing
Equipment AFM supplements, dated

[[Page 27727]]

February 20, 2007. These supplements incorporate all the actions from
the NPRM, including the requirement for the installation of a
functional low airspeed awareness system when flying into known icing
conditions.
We agree with the commenter that the additional systems referenced
would enhance safety. However, the accident/incident history on the
Models 208 and 208B does not justify requiring the installation of such
equipment through AD action. The pilot's failure to detect icing
conditions has not been the problem on the affected airplanes; the
problem has been having the information, training, and/or equipment
necessary to operate safely once icing conditions are encountered.
Additionally, the FAA examined the effectiveness of auto deice boot
cycling during icing tunnel tests in 2005 and discovered that, at
typical speeds associated with the Models 208 and 208B airplanes, the
deice boot clearing effectiveness was not significantly improved over
manually cycling at a certain accretion thickness. Therefore, the
benefit of an automatic deice boot cycling system would be to relieve
pilot workload. Service history on the Models 208 and 208B airplanes
and many other aircraft with manual boot cycling systems does not
justify the need to mandate an automatic system.
We are changing the final rule to require the incorporation of the
applicable S1 Known Icing Equipment AFM supplement, dated February 20,
2007, and the extension of the compliance time from 30 days to 90 days
after the effective date of the AD.

Conclusion

We have carefully reviewed the available data and determined that
air safety and the public interest require adopting the AD as proposed
except for the changes previously discussed and minor editorial
corrections. We have determined that these changes and minor
corrections:
Are consistent with the intent that was proposed in the
NPRM for correcting the unsafe condition; and
Do not add any additional burden upon the public than is
already required.

Costs of Compliance

We estimate that this AD affects 765 airplanes in the U.S.
registry.
The AD requires inserting the applicable new S1 Known Icing
Equipment AFM supplement, dated February 20, 2007, into the AFM/POH,
which includes the installation of a low airspeed awareness alert
system. We estimate the following costs to do the actions of this AD:

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Total cost per Total cost on
Labor cost Parts cost airplane U.S. operators
----------------------------------------------------------------------------------------------------------------
22 work-hours x $80 per hour = $1,760........................ $6,440 $8,200 $6,273,000
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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 AD.

Regulatory Findings

We have determined that this AD will not have federalism
implications under Executive Order 13132. This AD will 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 this AD:
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 summary of the costs to comply with this AD (and
other information as included in the Regulatory Evaluation) and placed
it in the AD Docket. You may get a copy of this summary by sending a
request to us at the address listed under ADDRESSES. Include ``Docket
No. FAA-2006-26498; Directorate Identifier 2006-CE-83-AD'' in your
request.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Safety.

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator,
the Federal Aviation Administration amends part 39 of the Federal
Aviation Regulations (14 CFR part 39) as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
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]

0
2. The FAA amends Sec. 39.13 by removing Airworthiness Directive (AD)
2006-06-06, Amendment 39-14514, (71 FR 13533, March 16, 2006), and
adding the following new AD:

2007-10-15 Cessna Aircraft Company: Amendment 39-15056; Docket No.
FAA-2006-26498; Directorate Identifier 2006-CE-83-AD.

Effective Date

(a) This AD becomes effective on June 21, 2007.

Affected ADs

(b) This AD supersedes AD 2006-06-06, Amendment 39-14514.

Applicability

Unsafe Condition

(d) This AD results from our determination that the revisions
dated February 20, 2007, to the S1 Known Icing Equipment AFM
supplement are necessary and should be incorporated into the
Airplane Flight Manual (AFM)/Pilot's Operating Handbook (POH); and
that a low airspeed awareness system should be required when
operating in known icing conditions. 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 in-flight
during icing conditions.

New Actions Required by this AD

(e) Unless already done, within the next 90 days after the
effective date of this AD,

[[Page 27728]]

incorporate the applicable new S1 Known Icing Equipment AFM
supplement, dated February 20, 2007, into the AFM/POH:

------------------------------------------------------------------------
Document Affects
------------------------------------------------------------------------
(1) Model 208 (675 SHP) FAA-approved Cessna Model 208 airplanes with
Flight Manual Supplement S1 ``Known a Pratt & Whitney of Canada
Icing Equipment,'' Cessna document Ltd., PT6A-114A turboprop
D1352-S1-10, dated February 20, 2007, engine installed (675 SHP) or
or later FAA-approved revision that FAA-approved engine of
incorporates the same information. equivalent or higher
horsepower installed, equipped
with airframe deicing
pneumatic boots, that are not
currently prohibited from
flight in known or forecast
icing
(2) Model 208 (600 SHP) FAA-approved Cessna Model 208 airplanes with
Flight Manual Supplement S1 ``Known a Pratt & Whitney of Canada
Icing Equipment,'' Cessna document Ltd., PT6A-114 turboprop
D1307-S1-09, dated February 20, 2007, engine installed (600 SHP) or
or later FAA-approved revision that FAA-approved engine of
incorporates the same information. equivalent horsepower
installed, equipped with
airframe deicing pneumatic
boots, that are not currently
prohibited from flight in
known or forecast icing.
(3) Model 208B (675 SHP) FAA-approved Cessna Model 208B airplanes
Flight Manual Supplement S1 ``Known with a Pratt & Whitney of
Icing Equipment,'' Cessna document Canada Ltd., PT6A-114A
D1329-S1-10, dated February 20, 2007, turboprop engine installed
or later FAA-approved revision that (675 SHP) or FAA-approved
incorporates the same information. 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.
(4) Model 208B (600 SHP) FAA-approved Cessna Model 208B airplanes
Flight Manual Supplement S1 ``Known with a Pratt & Whitney of
Icing Equipment,'' Cessna document Canada Ltd., PT6A-114
D1309-S1-10, dated February 20, 2007, turboprop engine installed
or later FAA-approved revision that (600 SHP) or FAA-approved
incorporates the same information. engine of equivalent
horsepower installed, equipped
with airframe deicing
pneumatic boots, that are not
currently prohibited from
flight in known or forecast
icing.
------------------------------------------------------------------------

Note: The above supplements require the installation of a
functional low airspeed awareness system. Cessna Service Bulletin
CAB06-11 and Service Kit SK 208-171, both dated October 9, 2006,
provide instructions for such an installation.

(f) 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 all paragraphs (e)(1) through (e)(4) of this AD. 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).

Actions Retained From AD 2006-06-06

(g) The actions in paragraphs (h) and (i) of this AD below are
retained in this AD from AD 2006-06-06. The new actions required by
this AD in paragraph (e) above terminate the requirement for the
actions in paragraphs (h) and (i) of this AD.
(h) No later than March 27, 2006 (3 days after March 24, 2006,
which is the effective date of AD 2006-06-06), incorporate the
following revisions into the Airplane Flight Manual (AFM), unless
already done:

------------------------------------------------------------------------
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 FAA-approved 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 FAA-approved engine of 208 (675 SHP) POH/FAA-approved
equivalent horsepower installed, AFM Supplement S1 ``Known
equipped with airframe deicing Icing Equipment,'' Cessna
pneumatic boots, that are not document D1352-S1-06, 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 FAA-approved engine of Cessna Model 208 (600 SHP) POH/
equivalent horsepower installed, FAA-approved AFM Supplement S1
equipped with airframe deicing ``Known Icing Equipment,''
pneumatic boots, that are not Cessna document D1307-S1-06,
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 FAA-approved 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 D1329-S1-07,
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 FAA-approved 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 D1309-S1-06,
currently prohibited from flight in dated June 27, 2005.
known or forecast icing.
------------------------------------------------------------------------

(i) No later than March 27, 2006 (3 days after March 24, 2006,
which is the effective date of AD 2006-06-06), you must do the
following actions, unless already done. These changes are to the POH
and FAA-approved AFM and to the POH/FAA-approved AFM Supplement S1
``Known Icing Equipment'' mandated in paragraph (h) of this AD. 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 do the placard POH/AFM requirements as specified in
the paragraphs below. 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):
(1) For Cessna Model 208 airplanes and Model 208B airplanes, all
serial numbers, equipped with airframe deicing pneumatic boots, that
are not currently prohibited from flight in known or forecast icing:
You are prohibited from continued flight after

[[Page 27729]]

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.
(2) For Cessna Model 208 airplanes and Model 208B airplanes, all
serial numbers, equipped with airframe deicing pneumatic boots, that
are not currently prohibited from flight in known or forecast icing:
(i) Insert the text in Appendix 1 of this AD preceding the KINDS
OF OPERATION LIMITS paragraph in the LIMITATIONS section of the
Cessna Models 208 or 208B POH and FAA-approved AFM.
(ii) Insert the text in Appendix 2 of this AD in the LIMITATIONS
section of the Cessna Models 208 or 208B POH and FAA-approved AFM
KNOWN ICING EQUIPMENT SUPPLEMENT S1 at the beginning of the
paragraph ``REQUIRED EQUIPMENT.''
(3) For Cessna Models and Models 208B airplanes, all serial
numbers, equipped with airframe deicing pneumatic boots that are not
currently prohibited from flight in known or forecast icing: Install
three placards with black letters on a white background. The
placards must be located on the instrument panel under the radio
stack, immediately above the pilot's flight instruments, or below
the vertical speed indicator. Lettering on the placard must be a
minimum height of 1/8-inch.
(i) Placard 1 must include the text of Appendix 3 of this AD.
(ii) Placard 2 must include the following text: ``120 KIAS
Minimum in Icing Flaps Up except 110 KIA if Climbing to Exit
Icing.''
(iii) Placard 3 must include the following text: ``Disconnect
autopilot at first indication of ice accretion.''
(4) For Cessna Models 208 and 208B airplanes, all serial
numbers, equipped with airframe deicing pneumatic boots that are not
currently prohibited from flight into known or forecast icing:
(i) Insert the text in Appendix 4 of this AD under the
``AIRSPEED LIMITATIONS'' paragraph in the LIMITATIONS section of the
Cessna Models 208 and 208B POH and FAA-approved AFM.
(ii) Replace the text in the KNOWN ICING EQUIPMENT SUPPLEMENT S1
under the ``MINIMUM SPEED IN ICING CONDITIONS'' paragraph with the
text in Appendix 4 of this AD.
(iii) Insert the following text in the LIMITATIONS section of
the POH/AFM under the ``OTHER LIMITATIONS'' paragraph and in the
LIMITATIONS section of the KNOWN ICING EQUIPMENT SUPPLEMENT S1 under
the ``AUTOPILOT OPERATION IN ICING CONDITIONS'' paragraph:
``Disconnect autopilot at first indication of ice accretion.''
(5) For Cessna Model 208 airplanes and Model 208B airplanes, all
serial numbers, equipped with airframe deicing pneumatic boots, that
are not currently prohibited from flight in known or forecast icing:
(i) Replace the text in the PERFORMANCE section of the Cessna
Models 208 or 208B POH and FAA-approved AFM KNOWN ICING EQUIPMENT
SUPPLEMENT S1 under the ``STALL SPEEDS'' paragraph with the text in
Appendix 5 of this AD.
(ii) Replace the ``WARNING'' text in the LIMITATIONS section of
the Cessna Models 208 or 208B POH and FAA-approved AFM KNOWN ICING
EQUIPMENT SUPPLEMENT S1 under ``ENVIRONMENTAL CONDITIONS'' with:
``FLIGHT IN THESE CONDITIONS ARE PROHIBITED.''
(iii) Replace the last two sentences in the LIMITATIONS section
of the Cessna Models 208 or 208B POH and FAA-approved AFM KNOWN
ICING EQUIPMENT SUPPLEMENT S1 under ``ENVIRONMENTAL CONDITIONS''
with the following text: ``Exit strategies should be determined
during pre-flight planning.''

Alternative Methods of Compliance (AMOCs)

(j) The Manager, Wichita Aircraft Certication (ACO), has the
authority to approve AMOCs for this AD, if requested using the
procedures found in 14 CFR 39.19. Send information to ATTN: Robert
P. Busto, Aerospace Engineer, Wichita ACO, FAA, 1801 Airport Road,
Wichita, Kansas 67209; telephone: (316) 946-4157; fax: (316) 946-
4107. Before using any approved AMOC on any airplane to which the
AMOC applies, notify your appropriate principal inspector (PI) in
the FAA Flight Standards District Office (FSDO), or lacking a PI,
your local FSDO.
(k) AMOCs approved for AD 2006-06-06 are approved for this AD
until the actions in paragraph (e) of this AD are done. After this,
they are no longer valid. The paragraph designations of the AMOC
refer to paragraphs (e) and (f) of AD 2006-06-06, which are
paragraphs (h) and (i) of this AD respectively.

Related Information

(l) To get copies of the AFM supplements and service information
referenced in this AD, contact: 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 PL-
401, Washington, DC, or on the Internet at http://dms.dot.gov. The

docket number is Docket No. FAA-2006-26498; Directorate Identifier
2006-CE-83-AD.

Appendix 1 Retained From AD 2006-06-06

Changes to the Cessna Models 208 or 208B Pilot's Operating Handbook
(POH) and FAA-Approved Airplane Flight Manual (AFM)

Affected Cessna Models 208 or 208B POH and FAA-Approved 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 FAA-approved 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 2006-06-06

Changes to the Cessna Models 208 or 208B Pilot's Operating Handbook
(POH) and FAA-Approved Airplane Flight Manual (AFM)

Affected Cessna Models 208 or 208B POH and FAA-Approved AFM

Insert the following text in the LIMITATIONS section of the POH
and FAA-approved 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 2006-06-06

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.''

[[Page 27730]]

Appendix 4 Retained From AD 2006-06-06

Changes to the Cessna Models 208 or 208B Pilot's Operating Handbook
(POH) and FAA-Approved Airplane Flight Manual (AFM) Supplement S1

Affected Cessna Models 208 or 208B POH and FAA-Approved AFM and
FAA-Approved Supplement S1

Insert the following text into the LIMITATIONS section under the
``AIRSPEED LIMITATIONS'' paragraph of the Cessna Models 208 or 208B
POH and FAA-approved 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/anti-icing 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 2006-06-06

Changes to the Cessna Models 208 or 208B Pilot's Operating Handbook
(POH) and FAA-Approved 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.''
``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.''

Issued in Kansas City, Missouri, on May 10, 2007.
David R. Showers,
Acting Manager, Small Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E7-9398 Filed 5-16-07; 8:45 am]

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