AD 2008-06-28

[Federal Register Volume 73, Number 59 (Wednesday, March 26, 2008)]
[Rules and Regulations]
[Pages 15862-15866]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: E8-5701]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0340; Directorate Identifier 2008-CE-020-AD; 
Amendment 39-15440; AD 2008-06-28]
RIN 2120-AA64


Airworthiness Directives; Avidyne Corporation Primary Flight 
Displays (Part Numbers 700-00006-000, -001, -002, -003, and -100)

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule; request for comments.

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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for 
certain Avidyne Corporation (Avidyne) Primary Flight Displays (PFDs) 
(Part Numbers (P/Ns) 700-00006-000, -001, -002, -003, and -100) that 
are installed on airplanes. This AD requires a check of the maintenance 
records and inspection of the PFD (if necessary) to determine if an 
affected serial number PFD is installed. If an affected serial number 
PFD is installed, this AD requires you to incorporate information that 
limits operation when certain conditions for the PFD or backup 
instruments exist. This AD results from several field reports of PFDs 
displaying incorrect altitude and airspeed information. We are issuing 
this AD to prevent certain conditions from existing when PFDs display 
incorrect attitude, altitude, and airspeed information. This could 
result in airspeed/altitude mismanagement or spatial disorientation of 
the pilot with consequent loss of airplane control, inadequate traffic 
separation, or controlled flight into terrain.

DATES: This AD becomes effective on April 10, 2008.
    We must receive any comments on this AD by May 27, 2008.

ADDRESSES: Use one of the following addresses to comment on this AD.
    <bullet> Federal eRulemaking Portal: Go to <a href="http://www.regulations.gov">http://www.regulations.gov</a>. Follow the instructions for submitting comments.
    <bullet> Fax: (202) 493-2251.
    <bullet> Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590.
    <bullet> Hand Delivery: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays.
    To get the service information identified in this AD, contact 
Avidyne Corporation, 55 Old Bedford Road, Lincoln, MA 01773; telephone: 
(781) 402-7400; fax: (781) 402-7599.
    To view the comments to this AD, go to <a href="http://www.regulations.gov">http://www.regulations.gov</a>. 
The docket number is FAA-2008-0340; Directorate Identifier 2008-CE-020-
AD.

FOR FURTHER INFORMATION CONTACT: Solomon Hecht, Aerospace Engineer, 
Boston Aircraft Certification Office, 12 New England Executive Park, 
Burlington, MA 01803; telephone: (781) 238-7159; fax: (781) 238-7170.

SUPPLEMENTARY INFORMATION:

Discussion

    We received several field reports of PFDs displaying incorrect 
altitude and airspeed information. These occurrences included incorrect 
display of information at system startup, including one or more of the 
following:
    <bullet> Altitude significantly in error when compared to field 
elevation with local barometric correction setting entered on PFD.
    <bullet> Altitude significantly in error when compared to backup 
altimeter with identical barometric correction settings.
    <bullet> Non-zero airspeed (inconsistent with high winds or 
propwash from a nearby airplane) indicated at system startup.
    <bullet> Altitude or airspeed indications that vary noticeably 
after startup under static conditions.
    <bullet> Erroneous airspeed indications in combination with 
erroneous attitude indications.
    <bullet> A steady or intermittent ``red X'' in place of the 
airspeed indicator, altimeter, vertical speed indicator, or attitude 
indicator.
    The conditions described above occur because of a manufacturing 
process

[[Page 15863]]

defect on a certain batch of PFD serial numbers during incorporation of 
a design improvement on the air data unit assembly. The root cause of 
this manufacturing process defect is still being analyzed.
    This condition, if not corrected, could result in airspeed/altitude 
mismanagement or spatial disorientation of the pilot and consequent 
loss of airplane control, inadequate traffic separation, or controlled 
flight into terrain.

FAA's Determination and Requirements of This AD

    We are issuing this AD because we evaluated all the information and 
determined the unsafe condition described previously is likely to exist 
or develop on type design airplanes that incorporate one of the 
affected PFDs. This AD requires a check of the maintenance records and 
inspection of the PFD (if necessary) to determine if an affected serial 
number PFD is installed. If an affected serial number PFD is installed, 
this AD requires you to incorporate information that limits operation 
when certain conditions for the PFD or backup instruments exist.
    This is considered interim action. Avidyne is working on a process 
to rework and/or modify the affected PFD units. The FAA will consider 
taking additional rulemaking action to supersede this AD and terminate 
the above limitations when Avidyne completes the process development, 
and the FAA approves it as addressing the unsafe condition.

FAA's Determination of the Effective Date

    An unsafe condition exists that requires the immediate adoption of 
this AD. The FAA has found that the risk to the flying public justifies 
waiving notice and comment prior to adoption of this rule because PFDs 
that display incorrect attitude, altitude, and airspeed information 
could result in airspeed/altitude mismanagement or spatial 
disorientation of the pilot with consequent loss of airplane control, 
inadequate traffic separation, or controlled flight into terrain. 
Therefore, we determined that notice and opportunity for public comment 
before issuing this AD are impracticable and that good cause exists for 
making this amendment effective in fewer than 30 days.

Comments Invited

    This AD is a final rule that involves requirements affecting flight 
safety, and we did not precede it by notice and an opportunity for 
public comment. We invite you to send any written relevant data, views, 
or arguments regarding this AD. Send your comments to an address listed 
under the ADDRESSES section. Include the docket number ``FAA-2008-0340; 
Directorate Identifier 2008-CE-020-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of the AD. We will consider 
all comments received by the closing date and may amend the AD in light 
of those comments.
    We will post all comments we receive, without change, to <a href="http://www.regulations.gov">http://www.regulations.gov</a>, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive concerning this AD.

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 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 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 AD and placed it in the AD docket.

Examining the AD Docket

    You may examine the AD docket that contains the AD, the regulatory 
evaluation, any comments received, and other information on the 
Internet at <a href="http://www.regulations.gov">http://www.regulations.gov</a>; 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) 647-5527) 
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.

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator, 
the FAA amends 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 adding the following new airworthiness 
directive (AD):

2008-06-28 Avidyne Corporation: Amendment 39-15440; Docket No. FAA-
2008-0340; Directorate Identifier 2008-CE-020-AD.

Effective Date

    (a) This AD becomes effective on April 10, 2008.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Avidyne Corporation (Avidyne) Primary 
Flight Displays (PFDs) (Part Numbers (P/Ns) 700-00006-000, 700-
00006-001, 700-00006-002, 700-00006-003, and 700-00006-100) that are 
installed on, but not limited to the following airplanes that are 
certificated in any category:
    (1) Adam Aircraft Model A500;
    (2) Cessna Aircraft Company Model 441 (STEC Alliant Supplemental 
Type Certificate (STC) No. SA09547AC-D incorporated);
    (3) Cessna Aircraft Company Models LC42-550FG and LC41-550FG 
(Columbia Aircraft Manufacturing and The Lancair Company previously 
held the type certificate for these airplanes);
    (4) Cirrus Design Corporation Models SR20 and SR22;

[[Page 15864]]

    (5) Diamond Aircraft Industries GmbH Model DA 40;
    (6) Hawker Beechcraft Corporation Model E90 (STEC Alliant STC 
No. SA09545AC-D incorporated);
    (7) Hawker Beechcraft Corporation Model 200 series (STEC Alliant 
STC No. SA09543AC-D incorporated); and
    (8) Piper Aircraft, Inc. Models PA-28-161, PA-28-181, PA-28R-
201, PA-32R-301 (HP), PA-32R-301T, PA-32-301FT, PA-32-301XTC, PA-34-
220T, PA-44-180, PA-46-350P, PA-46R-350T, and PA-46-500TP.

Unsafe Condition

    (d) This AD is the result of several field reports of PFDs 
displaying incorrect altitude and airspeed information. We are 
issuing this AD to prevent certain conditions from existing when 
PFDs display incorrect attitude, altitude, and airspeed information. 
This could result in airspeed/altitude mismanagement or spatial 
disorientation of the pilot with consequent loss of airplane 
control, inadequate traffic separation, or controlled flight into 
terrain.

Compliance

    (e) To address this problem, you must do the following, unless 
already done:

              Table 1.--Actions, Compliance, and Procedures
------------------------------------------------------------------------
           Actions                 Compliance            Procedures
------------------------------------------------------------------------
(1) Do a logbook check of     Within 15 days after  The owner/operator
 maintenance records to        April 10, 2008 (the   holding at least a
 determine if any PFD (P/Ns    effective date of     private pilot
 700-00006-000, 700-00006-     this AD).             certificate as
 001, 700-00006-002, 700-                            authorized by
 00006-003, or 700-00006-                            section 43.7 of the
 100) with any affected                              Federal Aviation
 serial number listed in                             Regulations (14 CFR
 TABLE 2--Serial Numbers of                          43.7) may do the
 Affected PFDs is installed.                         logbook check. Make
(i) If, as a result of this                          an entry into the
 check, you find any PFD                             aircraft logbook
 installed with an affected                          showing compliance
 serial number, do the                               with this portion
 action required by                                  of the AD in
 paragraph (e)(3)(i) or                              accordance with
 (e)(3)(ii) of this AD..                             section 43.9 of the
(ii) If, as a result of this                         Federal Aviation
 check, you cannot                                   Regulations (14 CFR
 positively identify the                             43.9).
 serial number of the PFD,
 do the inspection required
 in paragraph (e)(2) of this
 AD..
(iii) If, as a result of
 this check, you positively
 identify that the PFD
 installed does not have a
 serial number affected by
 this AD, then no further
 action is required..
(2) If you find, as a result  Within 15 days after  Not Applicable.
 of the check required by      April 10, 2008 (the
 paragraph (e)(1) of this AD   effective date of
 you cannot positively         this AD).
 identify the serial number
 of the PFD, inspect any PFD
 (P/Ns 700-00006-000, 700-
 00006-001, 700-00006-002,
 700-00006-003, or 700-00006-
 100) for any affected
 serial number listed in
 TABLE 2 --Serial Numbers of
 Affected PFDs. You may do
 the requirement of
 paragraph (e)(3) of this AD
 instead of this inspection.
(3) If you find, as a result  Within 15 days after  The owner/operator
 of the check required by      April 10, 2008 (the   holding at least a
 paragraph (e)(1) of this AD   effective date of     private pilot
 or the inspection required    this AD).             certificate as
 by paragraph (e)(2) of this                         authorized by
 AD, any PFD installed with                          section 43.7 of the
 an affected serial number,                          Federal Aviation
 do whichever of the                                 Regulations (14 CFR
 following applies:                                  43.7) may insert
(i) For airplanes with an                            the information
 airplane flight manual                              into the AFM, POH,
 (AFM), pilots operating                             AFMS, or
 handbook (POH), or airplane                         maintenance records
 flight manual supplement                            as required in
 (AFMS), incorporate the                             paragraph (e)(3)(i)
 language in the Appendix of                         or (e)(3)(ii)(A) of
 this AD into the                                    this AD and/or
 Limitations section.                                fabricate the
(ii) For airplanes without                           placard required in
 an AFM, POH, or AFMS, do                            paragraph
 the following:.                                     (e)(3)(ii)(B) of
(A) Incorporate the language                         this AD. Make an
 in the Appendix of this AD                          entry into the
 into your aircraft records;                         aircraft records
 and.                                                showing compliance
(B) fabricate a placard                              with these portions
 (using at least \1/8\-inch                          of the AD in
 letters) with the following                         accordance with
 words and install the                               section 43.9 of the
 placard on the instrument                           Federal Aviation
 panel within the pilot's                            Regulations (14 CFR
 clear view: ``AD 2008-06-28                         43.9).
 CONTAINS LIMITATIONS
 REGARDING AVIDYNE PRIMARY
 FLIGHT DISPLAYS (PFD) AND
 REQUIRED INCORPORATION OF
 THESE LIMITATIONS INTO THE
 AIRCRAFT RECORDS. YOU MUST
 FOLLOW THESE LIMITATIONS.''.

[[Page 15865]]

 
(4) Do not install any PFD    As of the effective   Not Applicable.
 (P/Ns 700-00006-000, 700-     date of this AD.
 00006-001, 700-00006-002,
 700-00006-003, or 700-00006-
 100) with any affected
 serial number listed in
 TABLE 2--Serial Numbers of
 Affected PFDs.
------------------------------------------------------------------------


    Note 1: If you have an AFM, POH, or AFMS, you may fabricate and 
install a placard as described in paragraph (e)(3)(ii) of this AD in 
addition to, but not instead of, the Limitations section requirement 
of paragraph (e)(3)(i) of this AD.


    Note 2: Avidyne Service Alert No. SA-08-001, dated February 12, 
2008, pertains to the subject matter of this AD. The service 
information cautions that all pilots should be vigilant in 
conducting proper preflight and in-flight checks of instrument 
accuracy.


                Table 2.--Serial Numbers of Affected PFDs
                             [AD 2008-06-28]
------------------------------------------------------------------------
 
-------------------------------------------------------------------------
D1023, D1031, D1037, D1069, D1075, D1080, D1084, D1090, D1101, D1102,
 D1106, D1112, D1115, D1136, D1138, D1141, D1144, D1158, D1170, D1172,
 D1174, D1178, D1188, D1197, D1199, D1212, D1234, D1240, D1249, D1253,
 D1254, D1256, D1259, D1260, D1262, D1270, D1272, D1277, D1283, D1288,
 D1313, D1319, D1327, D1351, D1364, D1380, D1387, D1391, D1396, D1405,
 D1412, D1428, D1433, D1434, D1435, F0006, F0011, F0021, F0030, F0031,
 F0032, F0035, 20002067, 20003147, 20003296, 20003316, 20004297,
 20005316, 20005487, 20008167, 20008227, 20008255, 20009297, 20009476,
 20010177, 20010255, 20011396, 20011456, 20012337, 20012506, 20013406,
 20014027, 20014227, 20015357, 20017286, 20018317, 20018425, 20018486,
 20019067, 20019297, 20020297, 20021067, 20021197, 20022177, 20022207,
 20022217, 20022286, 20022287, 20022296, 20023197, 20023377, 20024196,
 20024217, 20024297, 20024397, 20024407, 20024425, 20025067, 20025177,
 20025217, 20025317, 20026067, 20026197, 20026207, 20026265, 20026377,
 20026407, 20026506, 20027177, 20027226, 20027317, 20027377, 20028177,
 20028337, 20029177, 20029197, 20029246, 20029265, 20029506, 0030197,
 20030237, 20031207, 20031217, 20031406, 20031407, 20031516, 20032067,
 20032265, 20032337, 20032516, 20033337, 20034207, 20034327, 20035177,
 20036197, 20036237, 20036397, 20037265, 20037285, 20038127, 20038197,
 20038337, 20039177, 20040127, 20040177, 20040197, 20040265, 20040317,
 20041177, 20042197, 20042265, 20042317, 20042337, 20043197, 20043215,
 20043237, 20043247, 20044226, 20044237, 20044285, 20045215, 20045265,
 20045437, 20046215, 20047127, 20047147, 20047197, 20048197, 20048215,
 20048247, 20049147, 20049357, 20050147, 20050287, 20050346, 20050434,
 20051215, 20052215, 20053247, 20053257, 20053357, 20054247, 20054257,
 20054357, 20055087, 20056247, 20056257, 20057237, 20057346, 20058346,
 20061087, 20061247, 20062087, 20062247, 20063087, 20064087, 20064147,
 20064226, 20064337, 20066147, 20067087, 20068147, 20068337, 20069087,
 20071237, 20072087, 20073087, 20073346, 20073506, 20074207, 20075087,
 20075147, 20075207, 20076217, 20076257, 20077087, 20077506, 20078087,
 20078217, 20078257, 20078346, 20078496, 20084257, 20085396, 20087257,
 20089257, 20089346, 20090346, 20092297, 20093247, 20094107, 20094416,
 20097137, 20098037, 20099107, 20099346, 20099416, 20101416, 20102417,
 20103396, 20104246, 20106224, 20111224, 20112224, 20114416, 20115346,
 20116346, 20118416, 20123416, 20124456, 20126416, 20129346, 20135337,
 20139336, 20140336, 20142037, 20142296, 20146037, 20147336, 20153037,
 20158097, 20161097, 20164097, 20165097, 20166097, 20170097, 20170175,
 20172175, 20177175, 20202257, 20204175, 20209246, 20214175, 20216265,
 20217175, 20224175, 20224265, 20229265, 20232175, 20233175, 20236175,
 20236265, 20241175, 20243265, 20265355, 20272355, 20273355, 20278355,
 20281355, 20302384, 20308384, 20314384, 20317384, 20320305, 20321376,
 20330376, 20330384, 20343384, 20347305, 20348305, 20350305, 20356305,
 20359305, 20378475, 20380225, 20381225, 20382475, 20388225, 20402174,
 20403174, 20438345, 20440345, 20447425, 20452315, 20458315, 20462315,
 20467315, 20540094, 20550094, 20576445, 20580445, 20581445, 20582525,
 20584525, 20591525, 20595065, 20599065, 20605065, 20615116, 20618065,
 20638116, 20656284, 20732074, 20735176, 20739176, 20755493, 20814015,
 20815015, 20974365, 20978365, 20978434, 20986365, 20990434, 20998365,
 21002365, 21056395, 21060395, 21063184, 21063395, 21067184, 21070184,
 21075395, 21191045, 21200045, 21219045, 21294414, 21311414, 21315414,
 21324414, 21325414, 21330414, 21334414, 21340414, 21491056, 21493056,
 21596354, 21603435, 21604435, 21606435, 21608435, 21610435, 21614435,
 21646086, 21668086, 21812514, 21823514, 21826514, 21836304, 21839304,
 21852304, 22310186, 22378026, 22380026, 22398294, 22401294, 22405085,
 22412385, 22418026, 22418385, 22419026, 22470524, 22471524, 22472524,
 22479524, 22483524, 22486524, 22523204, 22525264, 22531204, 22559135,
 22568135, 22572135, 22578135, 22579135, 22586135, 22602135, 22603135,
 22608135, 22642493, 22647493, 22682076, 22908334, 22921334, 22961354,
 23166495, 23169495, 23173495, 23175495, 23182495, 23371455, 23378455,
 23443264, 23445264, 23448264, 23581244, 23602244, 23737136, 23738136,
 24021335, 24029335, 24231144, 24238144, 24248144, 24381324, 24478515,
 24735144, 24746144, 24750144, 24772085, 24773085, 24865155, 24867155,
 24870155, 24990084, 24991084, 24993084, 24996084, 25023034, 25027034,
 25522465, 25525465, 25530465, 25532465, 25538465, 25600465, 25618106,
 26287114, 26528095, 26547095, 26553095, 26569464, 26571095, 26572095,
 26584095, 26588464, 26592464, 27865034, 28478495, 28519495, 29019044,
 29023044, 29029044, 29031044, 29032044, 29512216, 29514216, and
 29522216.
------------------------------------------------------------------------

Alternative Methods of Compliance (AMOCs)

    (f) The Manager, Boston Aircraft Certification Office (ACO), 
FAA, has the authority to approve AMOCs for this AD, if requested 
using the procedures found in 14 CFR 39.19. Send information to 
ATTN: Solomon Hecht, Aerospace Engineer, Boston ACO, 12 New England 
Executive Park, Burlington, MA 01803; telephone: (781) 238-7159; 
fax: (781) 238-7170. 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.

Additional Information

    (g) For the service alert referenced in this AD, contact Avidyne 
Corporation, 55 Old Bedford Road, Lincoln, MA 01773; telephone: 
(781) 402-7400; fax: (781) 402-7599.

Appendix to AD 2008-06-28 Limitations Regarding Avidyne Primary Flight 
Displays (PFDs)

    Before conducting flight operations, pilots must review and be 
familiar with the Crosscheck Monitor section of the Avidyne Primary 
Flight Display Pilot's Guide and all limitations contained in the 
aircraft operating handbook.
    As a normal practice, all pilots should be vigilant in 
conducting proper preflight and

[[Page 15866]]

in-flight checks of instrument accuracy, including:
    <bullet> Preflight check of the accuracy of both the primary and 
backup altimeter against known airfield elevation and against each 
other.
    <bullet> Verification of airspeed indications consistent with 
prevailing conditions at startup, during taxi, and prior to takeoff.
    <bullet> ``Airspeed alive'' check and reasonable indications 
during takeoff roll.
    <bullet> Maintenance of current altimeter setting in both 
primary and backup altimeters.
    <bullet> Cross-check of primary and backup altimeters at each 
change of altimeter setting and prior to entering instrument 
meteorological conditions (IMC).
    <bullet> Cross-check of primary and backup altimeters and 
validation against other available data, such as glideslope 
intercept altitude, prior to conducting any instrument approach.
    <bullet> Periodic cross-checks of primary and backup airspeed 
indicators, preferably in combination with altimeter cross-checks.
    For flight operations under instrument flight rules (IFR) or in 
conditions in which visual reference to the horizon cannot be 
reliably maintained (that is IMC, night operations, flight 
operations over water, in haze or smoke) and the pilot has reasons 
to suspect that any source (PFD or back-up instruments) of attitude, 
airspeed, or altitude is not functioning properly, flight under IFR 
or in these conditions must not be initiated (when condition is 
determined on the ground) and further flight under IFR or in these 
conditions is prohibited until equipment is serviced and functioning 
properly.
    Operation of aircraft not equipped with operating backup (or 
standby) attitude, altimeter, and airspeed indicators that are 
located where they are readily visible to the pilot is prohibited.
    Pilots must frequently scan and crosscheck flight instruments to 
make sure the information depicted on the PFD correlates and agrees 
with the information depicted on the backup instruments.

    Issued in Kansas City, Missouri, on March 13, 2008.
David R. Showers,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.

[FR Doc. E8-5701 Filed 3-25-08; 8:45 am]
BILLING CODE 4910-13-P