1、g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66
2、g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g66g3g54g36g40g3g55g72g70g75g81g76g70g68g79g3g54g87g68g81g71g68g85g71g86g3g37g82g68g85g71g3g53g88g79g72g86g3g83g85g82g89g76g71g72g3g87g75g68g87g29g3g179g55g75g76g86g3g85g72g83g82g85g87g3g76
3、g86g3g83g88g69g79g76g86g75g72g71g3g69g92g3g54g36g40g3g87g82g3g68g71g89g68g81g70g72g3g87g75g72g3g86g87g68g87g72g3g82g73g3g87g72g70g75g81g76g70g68g79g3g68g81g71g3g72g81g74g76g81g72g72g85g76g81g74g3g86g70g76g72g81g70g72g86g17g3g3g55g75g72g3g88g86g72g3g82g73g3g87g75g76g86g3g85g72g83g82g85g87g3g76g86g3g7
4、2g81g87g76g85g72g79g92g3g89g82g79g88g81g87g68g85g92g15g3g68g81g71g3g76g87g86g3g68g83g83g79g76g70g68g69g76g79g76g87g92g3g68g81g71g3g86g88g76g87g68g69g76g79g76g87g92g3g73g82g85g3g68g81g92g3g83g68g85g87g76g70g88g79g68g85g3g88g86g72g15g3g76g81g70g79g88g71g76g81g74g3g68g81g92g3g83g68g87g72g81g87g3g76g81g
5、73g85g76g81g74g72g80g72g81g87g3g68g85g76g86g76g81g74g3g87g75g72g85g72g73g85g82g80g15g3g76g86g3g87g75g72g3g86g82g79g72g3g85g72g86g83g82g81g86g76g69g76g79g76g87g92g3g82g73g3g87g75g72g3g88g86g72g85g17g180g3g54g36g40g3g85g72g89g76g72g90g86g3g72g68g70g75g3g87g72g70g75g81g76g70g68g79g3g85g72g83g82g85g87g3
6、g68g87g3g79g72g68g86g87g3g72g89g72g85g92g3g73g76g89g72g3g92g72g68g85g86g3g68g87g3g90g75g76g70g75g3g87g76g80g72g3g76g87g3g80g68g92g3g69g72g3g85g72g89g76g86g72g71g15g3g85g72g68g73g73g76g85g80g72g71g15g3g86g87g68g69g76g79g76g93g72g71g15g3g82g85g3g70g68g81g70g72g79g79g72g71g17g3g3g54g36g40g3g76g81g89g76
7、g87g72g86g3g92g82g88g85g3g90g85g76g87g87g72g81g3g70g82g80g80g72g81g87g86g3g68g81g71g3g86g88g74g74g72g86g87g76g82g81g86g17g3g38g82g83g92g85g76g74g75g87g3g139g3g21g19g20g22g3g54g36g40g3g44g81g87g72g85g81g68g87g76g82g81g68g79g3g36g79g79g3 g85g76g74g75g87g86g3 g85g72g86g72g85g89g72g71g17g3 g49g82g3 g83g
8、68g85g87g3 g82g73g3 g87g75g76g86g3 g83g88g69g79g76g70g68g87g76g82g81g3 g80g68g92g3 g69g72g3 g85g72g83g85g82g71g88g70g72g71g15g3 g86g87g82g85g72g71g3 g76g81g3 g68g3 g85g72g87g85g76g72g89g68g79g3 g86g92g86g87g72g80g3 g82g85g3 g87g85g68g81g86g80g76g87g87g72g71g15g3 g76g81g3 g68g81g92g3 g73g82g85g80g3 g
9、82g85g3 g69g92g3 g68g81g92g3 g80g72g68g81g86g15g3 g72g79g72g70g87g85g82g81g76g70g15g3 g80g72g70g75g68g81g76g70g68g79g15g3g83g75g82g87g82g70g82g83g92g76g81g74g15g3g85g72g70g82g85g71g76g81g74g15g3g82g85g3g82g87g75g72g85g90g76g86g72g15g3g90g76g87g75g82g88g87g3g87g75g72g3g83g85g76g82g85g3g90g85g76g87g87
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
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