1、970 14 CFR Ch. I (1111 Edition) Pt. 39 spherical spreading and duration from the off-reference altitude. (c) The adjustment for the difference be-tween reference airspeed and adjusted ref-erence airspeed is calculated from: J3=10 log10(VRA/VR) dB; Where J3 is the quantity in decibels that must be al
2、gebraically added to the measured SEL noise level to correct for the influence of the adjustment of the reference airspeed on the duration of the measured fly-over event as perceived at the noise measure-ment station, VR is the reference airspeed as prescribed under section J36.3.(c) of this ap-pend
3、ix, and VRA is the adjusted reference air-speed as prescribed under section J36.105(c) of this appendix. (d) No correction for source noise during the flyover other than the variation of source noise accounted for by the adjust-ment of the reference airspeed prescribed for under section J36.105(c) o
4、f this appendix need be applied. (e) No correction for the difference be-tween the reference ground speed and the ac-tual ground speed need be applied. (f) No correction for off-reference atmos-pheric attenuation need be applied. (g) The SEL adjustments must be less than 2.0 dB(A) for differences be
5、tween test and ref-erence flight procedures prescribed under section J36.105 of this appendix unless a larg-er adjustment value is approved by the FAA. (h) All data used and calculations per-formed under this section must be docu-mented and provided under the reporting re-quirements specified under
6、section J36.111 of this appendix. PART DNOISE LIMITS PROCEDURE UNDER 36.805 Section J36.301 Noise Measurement, Evaluation, and Calculation. Compliance with this part of this appendix must be shown with noise levels measured, evaluated, and calculated as prescribed under parts B and C of this appendi
7、x. Section J36.303 Reserved Section J36.305 Noise Limits. For compliance with this appendix, the calculated noise levels of the helicopter, at the measuring point described in section J36.101 of this appendix, must be shown to not exceed the following (with appropriate interpolation between weights)
8、: (a) For primary, normal, transport, and re-stricted category helicopters having a max-imum certificated takeoff weight of not more than 7,000 pounds that are noise tested under this appendix, the Stage 2 noise limit is 82 decibels SEL for helicopters up to 1,737 pounds maximum certificated takeoff
9、 weight at which the noise certification is requested, and increasing at a rate of 3.0 decibels per doubling of weight thereafter. The limit may be calculated by the equation: LAE (limit) = 82 + 3.0 log10 (MTOW/1737)/log10(2) dB, where MTOW is the maximum takeoff weight, in pounds, for which certifi
10、cation under this ap-pendix is requested. (b) The procedures required in this amend-ment shall be done in accordance with the International Electrotechnical Commission IEC Publication No. 804, entitled Inte-grating-averaging Sound Level Meters, First Edition, dated 1985. This incorporation by refere
11、nce was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from the Bureau Central de la Commission Electrotechnique Inter-nationale, 1, rue de Varembe, Geneva, Swit-zerland or the American National Standard Institute, 1430 B
12、roadway, New York City, New York 10018, or at the National Archives and Records Administration (NARA). For in-formation on the availability of this mate-rial at NARA, call 2027416030, or go to: http:/www.archives.gov/federallregister/ codeloflfederallregulations/ ibrllocations.html. Doc. No. 26910,
13、57 FR 42855, Sept. 16, 1992, as amended by Amdt. 3620, 57 FR 46243, Oct. 7, 1992; 69 FR 18803, Apr. 9, 2004; Amdt. 3625, 69 FR 31234, June 2, 2004 PART 39AIRWORTHINESS DIRECTIVES Sec. 39.1 Purpose of this regulation. 39.3 Definition of airworthiness directives. 39.5 When does FAA issue airworthiness
14、 di-rectives? 39.7 What is the legal effect of failing to comply with an airworthiness directive? 39.9 What if I operate an aircraft or use a product that does not meet the require-ments of an airworthiness directive? 39.11 What actions do airworthiness direc-tives require? 39.13 Are airworthiness d
15、irectives part of the Code of Federal Regulations? 39.15 Does an airworthiness directive apply if the product has been changed? 39.17 What must I do if a change in a prod-uct affects my ability to accomplish the actions required in an airworthiness di-rective? 39.19 May I address the unsafe conditio
16、n in a way other than that set out in the air-worthiness directive? 39.21 Where can I get information about FAA-approved alternative methods of compliance? 39.23 May I fly my aircraft to a repair facil-ity to do the work required by an air-worthiness directive? VerDate Mar2010 14:10 Mar 01, 2011 Jkt
17、 223043 PO 00000 Frm 00980 Fmt 8010 Sfmt 8010 Y:SGML223043.XXX 223043wwoods2 on DSK1DXX6B1PROD with CFRProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-971 Federal Aviation Administration, DOT 39.17 39.25 How do I get a special flight permit? 39.27 Wh
18、at do I do if the airworthiness di-rective conflicts with the service docu-ment on which it is based? AUTHORITY: 49 U.S.C. 106(g), 40113, 44701. SOURCE: Doc. No. FAA20008460, 67 FR 48003, July 22, 2002, unless otherwise noted. 39.1 Purpose of this regulation. The regulations in this part provide a l
19、egal framework for FAAs system of Airworthiness Directives. 39.3 Definition of airworthiness di-rectives. FAAs airworthiness directives are legally enforceable rules that apply to the following products: aircraft, air-craft engines, propellers, and appli-ances. 39.5 When does FAA issue airworthi-nes
20、s directives? FAA issues an airworthiness direc-tive addressing a product when we find that: (a) An unsafe condition exists in the product; and (b) The condition is likely to exist or develop in other products of the same type design. 39.7 What is the legal effect of failing to comply with an airwor
21、thiness di-rective? Anyone who operates a product that does not meet the requirements of an applicable airworthiness directive is in violation of this section. 39.9 What if I operate an aircraft or use a product that does not meet the requirements of an airworthi-ness directive? If the requirements
22、of an airworthi-ness directive have not been met, you violate 39.7 each time you operate the aircraft or use the product. 39.11 What actions do airworthiness directives require? Airworthiness directives specify in-spections you must carry out, condi-tions and limitations you must comply with, and an
23、y actions you must take to resolve an unsafe condition. 39.13 Are airworthiness directives part of the Code of Federal Regula-tions? Yes, airworthiness directives are part of the Code of Federal Regulations, but they are not codified in the annual edi-tion. FAA publishes airworthiness di-rectives in
24、 full in the FEDERAL REG-ISTER as amendments to 39.13. EDITORIAL NOTE: For a complete list of ci-tations to airworthiness directives published in the FEDERAL REGISTER, consult the fol-lowing publications: For airworthiness direc-tives published in the FEDERAL REGISTER since 2001, see the entries for
25、 14 CFR 39.13 in the List of CFR Sections Affected, which ap-pears in the Finding Aids section of the printed volume and at www.fdsys.gov. For ci-tations to prior amendments, see the entries for 14 CFR 39.13 in the separate publications List of CFR Sections Affected, 19731985, List of CFR Sections A
26、ffected, 19641972, and List of CFR Sections Affected, 1986 2000, and the entries for 14 CFR 507.10 in the List of Sections Affected, 19491963. See also the annual editions of the Federal Reg-ister Index for subject matter references and citations to FAA airworthiness directives. 39.15 Does an airwor
27、thiness directive apply if the product has been changed? Yes, an airworthiness directive ap-plies to each product identified in the airworthiness directive, even if an indi-vidual product has been changed by modifying, altering, or repairing it in the area addressed by the airworthi-ness directive.
28、39.17 What must I do if a change in a product affects my ability to accom-plish the actions required in an air-worthiness directive? If a change in a product affects your ability to accomplish the actions re-quired by the airworthiness directive in any way, you must request FAA ap-proval of an alter
29、native method of compliance. Unless you can show the change eliminated the unsafe condi-tion, your request should include the specific actions that you propose to ad-dress the unsafe condition. Submit your request in the manner described in 39.19. VerDate Mar2010 14:10 Mar 01, 2011 Jkt 223043 PO 000
30、00 Frm 00981 Fmt 8010 Sfmt 8010 Y:SGML223043.XXX 223043wwoods2 on DSK1DXX6B1PROD with CFRProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-972 14 CFR Ch. I (1111 Edition) 39.19 39.19 May I address the unsafe condi-tion in a way other than that set out
31、in the airworthiness directive? Yes, anyone may propose to FAA an alternative method of compliance or a change in the compliance time, if the proposal provides an acceptable level of safety. Unless FAA authorizes other-wise, send your proposal to your prin-cipal inspector. Include the specific ac-ti
32、ons you are proposing to address the unsafe condition. The principal inspec-tor may add comments and will send your request to the manager of the of-fice identified in the airworthiness di-rective (manager). You may send a copy to the manager at the same time you send it to the principal inspector.
33、If you do not have a principal inspector send your proposal directly to the man-ager. You may use the alternative you propose only if the manager approves it. 39.21 Where can I get information about FAA-approved alternative methods of compliance? Each airworthiness directive identi-fies the office r
34、esponsible for approving alternative methods of compliance. That office can provide information about alternatives it has already ap-proved. 39.23 May I fly my aircraft to a re-pair facility to do the work re-quired by an airworthiness direc-tive? Yes, the operations specifications giving some opera
35、tors authority to op-erate include a provision that allow them to fly their aircraft to a repair fa-cility to do the work required by an airworthiness directive. If you do not have this authority, the local Flight Standards District Office of FAA may issue you a special flight permit unless the airw
36、orthiness directive states oth-erwise. To ensure aviation safety, FAA may add special requirements for oper-ating your aircraft to a place where the repairs or modifications can be accom-plished. FAA may also decline to issue a special flight permit in particular cases if we determine you cannot mov
37、e the aircraft safely. 39.25 How do I get a special flight permit? Apply to FAA for a special flight per-mit following the procedures in 14 CFR 21.199. 39.27 What do I do if the airworthi-ness directive conflicts with the service document on which it is based? In some cases an airworthiness direc-ti
38、ve incorporates by reference a manu-facturers service document. In these cases, the service document becomes part of the airworthiness directive. In some cases the directions in the service document may be modified by the air-worthiness directive. If there is a con-flict between the service document
39、 and the airworthiness directive, you must follow the requirements of the air-worthiness directive. PART 43MAINTENANCE, PREVEN-TIVE MAINTENANCE, REBUILD-ING, AND ALTERATION Sec. 43.1 Applicability. 43.2 Records of overhaul and rebuilding. 43.3 Persons authorized to perform mainte-nance, preventive m
40、aintenance, rebuild-ing, and alterations. 43.5 Approval for return to service after maintenance, preventive maintenance, rebuilding, or alteration. 43.7 Persons authorized to approve aircraft, airframes, aircraft engines, propellers, appliances, or component parts for re-turn to service after mainte
41、nance, pre-ventive maintenance, rebuilding, or al-teration. 43.9 Content, form, and disposition of main-tenance, preventive maintenance, re-building, and alteration records (except inspections performed in accordance with part 91, part 123, part 125, 135.411(a)(1), and 135.419 of this chap-ter). 43.
42、10 Disposition of life-limited aircraft parts. 43.11 Content, form, and disposition of records for inspections conducted under parts 91 and 125 and 135.411(a)(1) and 135.419 of this chapter. 43.12 Maintenance records: Falsification, re-production, or alteration. 43.13 Performance rules (general). 43
43、.15 Additional performance rules for in-spections. 43.16 Airworthiness Limitations. VerDate Mar2010 14:10 Mar 01, 2011 Jkt 223043 PO 00000 Frm 00982 Fmt 8010 Sfmt 8010 Y:SGML223043.XXX 223043wwoods2 on DSK1DXX6B1PROD with CFRProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
