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CFR Citation: 14 CFR Part 39

Docket ID: [Docket No. FAA-2008-0353; Directorate Identifier 2007-CE-101-AD]

RIN ID: RIN 2120-AA64

NOTICE: PROPOSED RULES

ACTION: Airworthiness Directives:

DOCUMENT ACTION: Notice of proposed rulemaking (NPRM).

SUBJECT CATEGORY: Airworthiness Directives; Hawker Beechcraft Corporation Model 390 Airplanes

DATES: We must receive comments on this proposed AD by May 27, 2008.

DOCUMENT SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Hawker Beechcraft Corporation Model 390 airplanes. This proposed AD would require you to repetitively do a postflight check (owner/operator holding at least a private pilot certificate checking for residual heat in the angleofattack (AOA) probes or an
appropriatelyrated mechanic doing a maintenance manual operational test of the heat of the AOA probes) after every flight and replace or modify (upload software) the stall warning AOA transmitters. This proposed AD results from reports of the potential for unannunciated loss of the heating function in the lefthand (LH) and righthand (RH) stall warning AOA transmitters of Model 390 airplanes. We are proposing this AD to correct potentially inadequate stall warning with loss of stick pusher function.

SUMMARY: Hawker Beechcraft Corporation Model 390 Airplanes,

SUPPLEMENTAL INFORMATION

We invite you to send any written relevant data, views, or arguments regarding this proposed AD. Send your comments to an address listed under the ADDRESSES section. Include the docket number, ``FAA 20080353; Directorate Identifier 2007CE101AD'' at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of the proposed AD. We will consider all comments received by the closing date and may amend the proposed AD in light of those comments.

We will post all comments we receive, without change, to http:// www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive concerning this proposed AD.

Discussion

We have received reports of the potential for unannunciated loss of the heating function in the LH/RH stall warning AOA transmitters of Model 390 airplanes. The current AOA transmitter software may not always annunciate certain failure modes of the probe or case heating circuits.

This condition, if not corrected, could result in potentially inadequate stall warning with loss of stick pusher function. Relevant Service Information

We have reviewed Hawker Beechcraft Mandatory Service Bulletin No. SB 273787, issued: May 2007; and Raytheon Aircraft Company Temporary Change to the FAA Approved Airplane Flight Manual P/N 390590001 0003CTC7, issued: March 15, 2007. The service information describes procedures for the replacement/modification of the stall warning AOA transmitters. The airplane flight manual (AFM) describes procedures for doing a postflight check. This postflight check can be either the pilot checking for residual heat in the AOA probes as part of the shutdown procedure or, alternatively, having the AOA probe heat operational test maintenance manual procedure done by an appropriately rated mechanic.

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 require a repetitive postflight check for residual heat in the AOA probes or a maintenance manual operational test of the heat of the AOA probes after every flight and replace or modify (upload software) the stall warning AOA transmitters. Replacement or modification (upload software) of the stall warning AOA transmitters terminates the repetitive requirement to do the postflight action.

Costs of Compliance

We estimate that this proposed AD would affect 152 airplanes in the U.S. registry.

We estimate the following costs to incorporate and remove the temporary change to the AFM.
Total cost per Labor cost Parts cost airplane 0.5 workhour x $80 per hour = Not Applicable...... $40 $40.

[[Page 15679]]

We estimate that the proposed postflight residual heat check requires about 3 minutes to do. We estimate the following costs to do 10 of the proposed postflight residual heat checks. We have no way of determining the number of airplanes that would have this postflight residual heat check, or how many times this will need to be performed before the terminating action is done:
Labor cost to do 10 postflight Total cost per residual heat checks Parts cost airplane 0.5 workhour x $80 per hour = Not Applicable...... $40 $40.

We estimate the following costs to do the proposed maintenance manual operational test of the heat of the AOA probes. We have no way of determining the number of airplanes that would have this operational test, or how many times this will need to be performed before the terminating action is done:
Total cost per Labor cost Parts cost airplane 0.5 workhour x $80 per hour = Not Applicable...... $40 $40.

We estimate the following costs to do any proposed upload of software to the AOA transmitters. We have no way of determining the number of airplanes that would have this modification:
Total cost per Labor cost Parts cost airplane 4 workhours x $80 per hour = Not Applicable...... $320 $320.

We estimate the following costs to do any proposed replacement of 2 stall warning AOA transmitters. We have no way of determining the number of airplanes that would have this replacement:
Total cost per Labor cost Parts cost airplane 2 workhours x $80 per hour = $160.... $18,600 $18,760 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://www.regulations.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) 6475527) 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 adding the following new AD: [[Page 15680]]
Hawker Beechcraft Corporation: Docket No. FAA20080353; Directorate Identifier 2007CE101AD.
Comments Due Date
(a) We must receive comments on this airworthiness directive (AD) action by May 27, 2008.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Model 390 airplanes, serial numbers RB4 through RB204, that are certificated in any category.
Unsafe Condition
(d) This AD results from reports of the potential for
unannunciated loss of the heating function in the lefthand (LH) and righthand (RH) stall warning angleofattack (AOA) transmitters of Model 390 airplanes. We are issuing this AD to correct potentially inadequate stall warning with loss of stick pusher function. Compliance
(e) To address this problem, you must do the following, unless already done:
Actions Compliance Procedures (1) Incorporate Raytheon Aircraft Company Within 15 hours timeinservice Not Applicable. Temporary Change to the FAA Approved (TIS) after the effective date Airplane Flight Manual P/N 390590001 of the AD or within 30 days 0003CTC7, issued: March 15, 2007, into the after the effective date of the airplane flight manual (AFM). AD, whichever occurs first. (2) After every flight do the following: Within 15 hours TIS after the (A) For the postflight check (i) Do a postflight check for residual heat effective date of the AD or for residual heat in the AOA in the AOA probes. CAUTION: TO PREVENT within 30 days after the probes: Follow AFM Temporary POSSIBLE BURNS, USE EXTREME CAUTION TOUCHING effective date of the AD, Change P/N 390590001 HEATED AREAS. TO CHECK HEATING AND AVOID whichever occurs first. 0003CTC7, issued: March 15, BURNS, HOLD HAND NEAR HEATED AREA OR MOVE Completion of paragraph 2007. The owner/operator HAND GRADUALLY FROM AMBIENT AREA TOWARD (e)(3)(i) or (e)(3)(ii) of this holding at least a private HEATED AREA UNTIL WARMTH CAN BE FELT. If you AD terminates the required pilot certificate as do not feel heat in the AOA probes, then do repetitive postflight check of authorized by section 43.7 of paragraph (e)(2)(ii) of this AD; or this AD. the Federal Aviation (ii) Do a postflight maintenance manual Regulations (14 CFR 43.7) may operational test of the heat of the AOA do this postflight check probes. If the AOA probe fails the required by paragraph operational test, replace the AOA probe. (e)(2)(i) of this AD. Make an entry into the aircraft records showing compliance with this AD following section 43.9 of the Federal Aviation Regulations (14 CFR 43.9). (B) For the postflight maintenance manual operational test of the heat of the AOA probes: Follow the procedures of the maintenance manual to do the operational test of the heat of the AOA probes required by paragraph (e)(2)(ii) of this AD. The maintenance manual operational test must be done by an appropriatelyrated mechanic. (C) For AOA probe replacement: Follow Hawker Beechcraft Mandatory Service Bulletin No. SB 273787, issued: May 2007. (3) Replace or modify (upload software) the Within 250 hours TIS after the Follow Hawker Beechcraft stall warning AOA transmitters by doing one effective date of this AD or Mandatory Service Bulletin No. of the following: within 12 months after the SB 273787, issued: May 2007. (i) Upload new software Kit No. 1233436 effective date of this AD, (Field Software Upload SLZ80603,4) to the whichever occurs first. AOA transmitters; or Completion of either paragraph (ii) Replace any part number (P/N) SLZ80603 (e)(3)(i) or (e)(3)(ii) of this and/or P/N SLZ80604 AOA transmitters with AD terminates the required new P/N SLZ80605 AOA transmitters. repetitive postflight check of this AD.
(4) Remove Raytheon Aircraft Company Before further flight after Follow Hawker Beechcraft Temporary Change to the FAA Approved doing the actions required by Mandatory Service Bulletin No. Airplane Flight Manual P/N 390590001 paragraph (e)(3)(i) or SB 273787, issued: May 2007. 0003CTC7, issued: March 15, 2007, from the paragraph (e)(3)(ii) of this AD. AFM.
(5) Do not install any P/N SLZ80603 or P/N As of the effective date of this Not Applicable. SLZ80604 AOA transmitter that does not have AD.
the new upgraded software required by
paragraph (e)(3)(i) of this AD.
Alternative Methods of Compliance (AMOCs)
(f) The Manager, Wichita 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

FOR FURTHER INFORMATION CONTACT Philip Petty, Aerospace Engineer, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Wichita, Kansas 67209; telephone: (316) 9464139; fax: (316) 9464107.