SAE AS 4787-1992 Eddy Current Inspection of Circular Holes in Nonferrous Metallic Aircraft Engine Hardware《飞机发动机非铁金属构件中圆孔的涡电流检查》.pdf

《SAE AS 4787-1992 Eddy Current Inspection of Circular Holes in Nonferrous Metallic Aircraft Engine Hardware《飞机发动机非铁金属构件中圆孔的涡电流检查》.pdf》由会员分享，可在线阅读，更多相关《SAE AS 4787-1992 Eddy Current Inspection of Circular Holes in Nonferrous Metallic Aircraft Engine Hardware《飞机发动机非铁金属构件中圆孔的涡电流检查》.pdf（16页珍藏版）》请在麦多课文档分享上搜索。

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10、g72g81g3g83g72g85g80g76g86g86g76g82g81g3g82g73g3g54g36g40g17g3TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this T

11、echnical Report, please visit http:/www.sae.org/technical/standards/AS4787g3AEROSPACESTANDARDAS4787 g44g86g86g88g72g71g3 g20g28g28g21g16g20g19g3g53g72g68g73g73g76g85g80g72g71g3 g21g19g20g22g16g19g25g3g3g40g71g71g92g3g38g88g85g85g72g81g87g3g44g81g86g83g72g70g87g76g82g81g3g82g73g3g38g76g85g70g88g79g68

12、g85g3g43g82g79g72g86g3g76g81g3g49g82g81g73g72g85g85g82g88g86g3g48g72g87g68g79g79g76g70g3g36g76g85g70g85g68g73g87g3g40g81g74g76g81g72g3g43g68g85g71g90g68g85g72g3g53g36g55g44g50g49g36g47g40g3g36g54g23g26g27g26g3g75g68g86g3g69g72g72g81g3g85g72g68g73g73g76g85g80g72g71g3g87g82g3g70g82g80g83g79g92g3g90g76

13、g87g75g3g87g75g72g3g54g36g40g3g73g76g89g72g16g92g72g68g85g3g85g72g89g76g72g90g3g83g82g79g76g70g92g17g3g3TABLE OF CONTENTS1. SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.1 Purpose . . . . . . . . . . . . .

14、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.2 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.3 Definitions . . . . . . . . . . . . . . . . . .

15、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32. APPLICABLE DOCUMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.1 U.S. Government Publications . . . . . . . . . . . . . . . . . . . . . . . . . . .

16、. . . . . . . . . . . . . . . . . . . . 32.2 ASNT Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42.3 ATA Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

17、 . . . . . . . 43. TECHNICAL REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.1 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.1.1 Tape . . . .

18、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.1.2 Cleaning Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.1.3 Marking Devices . . . .

19、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.2 Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.2.1 Eddy Current Probes . . . . . . . . . . .

20、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.2.2 Eddy Current Instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53.2.3 Mechanical Probe Manipulation Devices . . . . . . . . . . . . . . . . .

21、 . . . . . . . . . . . . . . . . . . . . . . . 93.2.4 Data Recording Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93.2.5 Calibration Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

22、. . . . . . . . . 93.3 Personnel Qualification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103.4 Inspection Procedure Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103.5 Part Preparati

23、on for Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123.6 Equipment Calibration - Manual Probe Manipulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123.7 Equipment Calibration - Mechanical Probe Manipulation. . . . . .

24、 . . . . . . . . . . . . . . . . . . . . . . 133.8 Part Inspection - General Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143.9 Posttest Calibration Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

25、 . . 143.10 Indication Evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15TABLE OF CONTENTS (Continued)4. QUALITY ASSURANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26、154.1 Records. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154.2 Facilities/Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164.3 Calibration St

27、andards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164.4 Inspection Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164.5 Quality Assurance Plans . . . . . . . . . .

28、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164.6 Calibration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16FIGURE 1 Typical Eddy Current Probe . . . . . . . . . . . . . . . . . . . .

29、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6FIGURE 2 Eddy Current Displays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7FIGURE 3 Eddy Current and Meter Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

30、 . . . . . . . . . . . . . . 8FIGURE 4 Typical Calibration Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11g54g36g40 g36g54g23g26g27g26 g51g68g74g72g3g21g3g82g73g3g20g25_1. SCOPE:1.1 Purpose:This SAE Aerospace Standard (AS) establishes min

31、imum requirements for eddy current inspection of circular holes in nonferrous, metallic, aircraft engine hardware with fasteners removed. The inspection is intended to be performed at maintenance and overhaul facilities on engine run hardware.1.2 Application:This standard has been typically used to

32、inspect for service-induced surface and near surface cracks, but usage is not limited to such applications.1.3 Definitions:1.3.1 PURCHASER: The organization that issued the procurement document invoking this specification.1.3.2 SUPPLIER: Source, other than the purchaser, who provides inspection serv

33、ices.1.3.3 INSPECTION PROCEDURE: Document written by the purchaser detailing inspection requirements.1.3.4 QUALITY ASSURANCE PLAN: Document written by the supplier outlining specific requirements unique to his/her facility in accordance with inspection procedure.2. APPLICABLE DOCUMENTS:The following

34、 publications form a part of this specification to the extent specified herein. The applicable issue of referenced publications shall be the issue in effect on the date of the purchase order.2.1 U.S. Government Publications:Available from DODSSP, Subscription Services, Building 4D, 700 Robbins Avenu

35、e, Philadelphia, PA 19111-5094.MIL-I-23594 Insulation Tape, Electrical, High Temperature, Polytetrafluoroethylene,Pressure SensitiveMIL-STD-410 Nondestructive Testing Personnel Qualification and Certification (EddyCurrent, Liquid Penetrant, Magnetic Particle, Radiographic, and Ultrasonic)MIL-STD-456

36、62 Calibration System Requirementsg54g36g40 g36g54g23g26g27g26 g51g68g74g72g3g22g3g82g73g3g20g25_2.2 ASNT Publications:Available from ASNT, 1711 Arlington Lane, P.O. Box 28518, Columbus, OH 43228.SNT-TC-1A Recommended Practice, Personnel Qualification and Certification in NondestructiveTesting2.3 AT

37、A Publications:Available from Air Transport Association of America, 1301 Pennsylvania Avenue, N.W., Suite 1100, Washington, DC 20006.ATA 105 Guidelines for Training and Qualifying Personnel in Nondestructive Testing Methods3. TECHNICAL REQUIREMENTS:3.1 Materials:The high temperature, high speed envi

38、ronment in which many aircraft engine components operate results in an increased sensitivity to mechanical or chemical damage during maintenance activities. Personnel performing eddy current inspections must be aware of the need to ensure that the materials they use which come in contact with the ha

39、rdware must be carefully chosen to avoid introducing chemical contamination or causing physical damage. Engine manufacturers can provide information regarding the suitability of specific materials or procedures for use on their hardware.3.1.1 Tape: MIL-I-23594, Type I, 0.003 to 0.005 in (0.08 to 0.1

40、3 mm) thick. Alternate tapes may be used if specified in the appropriate inspection procedure.3.1.2 Cleaning Materials: Mild abrasive cleaning products may be used, if allowed by the purchaser, for the removal of surface contamination. Such products shall not be aggressive enough to remove the base

41、metal or otherwise alter or damage the part. If allowed, mild, nonmetallic abrasive cleaning pads can be torn in strips or circular nonmetallic brushes may be used to clean the inside diameter of holes. These materials shall be specified in the inspection procedure.3.1.3 Marking Devices: Approved ma

42、rking device for numbering part features and identifying the locations of suspect test indications that are acceptable to the purchaser.3.2 Equipment:3.2.1 Eddy Current Probes:3.2.1.1 Select probes based on the minimum diameter of the holes to be inspected. The hole diameter and appropriate probe fo

43、r any particular inspection shall be as specified in the inspection procedure. Depending on the type of probe, it is recommended that the purchaser consider the hole diameter range for the probe being specified.g54g36g40 g36g54g23g26g27g26 g51g68g74g72g3g23g3g82g73g3g20g25_3.2.1.2 Absolute (single c

44、oil), differential (dual coil), and reflection (driver-pickup) coil configurations, with or without magnetic shielding, shall be used as specified in the inspection procedure.3.2.1.3 Probes shall be designed to maintain contact with the inspection surface at all times during the inspection. Nonconta

45、ct probes which operate with a gap between the probe and the inspection surface are not acceptable.3.2.1.4 Probes with operating frequencies of 500 KHz or higher shall be used, unless otherwise specified by the appropriate inspection procedure.3.2.1.5 All probes shall be identified with the manufact

46、urers name, frequency or frequency range, and a unique serial number (reference Figure 1).3.2.1.6 Eddy current probe sensing coils shall be prevented from directly contacting the surface of the part being inspected. This may be accomplished by covering the coil surface with low-friction tape, by rec

47、essing the coil from the surface of the probe, by manufacturing the probe with a suitable wear surface over the coil, or by other means specified in the inspection procedure.3.2.1.7 Precautions shall be taken to protect the part being inspected from wear or abrasion from contact with any metallic po

48、rtion of the probe or test equipment.3.2.1.8 Probes shall not give interfering responses from handling pressures, manipulation, or normal operating pressure variations on the sensing coil.3.2.2 Eddy Current Instruments: Eddy current instruments are available which have a wide range of capabilities. The features required for any particular inspection shall be specified in the inspection procedure.3.2.2.1 Display: Eddy current instruments can be classified into two basic categories according to the manner in which they display eddy current information. These categories are specified in 3.2.2.1