1、SAE ARP*841A 8B W 8357340 O029327 7 W Ih The Engineering Society AEROSPACE ARP 841 For Advancing Mobility Land Sea Air and Space RECOMMENDED I Issued 12-1-68 I Rev. 400 COMMONWEALTH DRIVE, WARRENDALE, PA 15096 PRACTICE IA Revised 1-18-88 Submitted for recognition as an American National Standard LEA
2、DS, FLEXIBLE, SHIELDED, HIGH ENERGY IGNITION 1. SCOPE AND CLASSIFICATION: 1 .l Scope: This specification establishes the requirements for shielded, kj flexible, high energy ignition leads for gas turbine engines. 2. 1.2 Classification: The leads shall be of the following classification for use in th
3、e stipulated temperature and vol tage ranges: Temperature Ranges GRADE A 250 to -65F GRADE B 450 to -65F GRADE C 600 to -65F GRADE D 1000 to -65F GRADE E 1500 to -65F Vol tage Ranges CLASS I CLASS II CLASS III 15 kv Max CLASS IV 20 kv Max CLASS V 30 kv Max 5 kv Max (Low Voltage) 10 kv Max (Grade D t
4、liformation as specified on the detailed drawing. 3.4 Workmanchip: All details of workmanship shall be in accordance with high $rade practice suitable for aircraft ignition components. SAE ARP*BLiLA 88 W 8357340 0027327 O ARP 841A -A#! Page 3 - 3.5 Performance: Leads shall satisfy the requirements s
5、pecified in paragraph 4. 4. INSPECTION AND QUALIFICATION TESTS: 4.1 Test Classifications: The inspection and testing of shielded high energy ignition leads shall be classified as follows: (a) Qualification Tests: Qualification tests are those tests accomplished on samples submitted for qualification
6、 as a satisfactory product, and such other tests as required by the detail specification. Inspection Tests: leads manufactured and submitted toward fulfillmen of a contract or purchase order. (b) Inspection tests are those tests accompl ished on 4.2 Qualification Tests: The qualification tests of le
7、ads shall consist of at least the following tests conducted on the qualification test samples: 4.2.1 Examination of Product: Reference paragraph 5.2. 4.2.2 Resistance Tests: (a) Joint Resistance: Reference paragraph 5.3.1. (b) Shielding Resistance: Reference paragraph 5.3.2. 4.2.3 Continuity Test: (
8、a) Low Vol tage Conti nui ty : Reference paragraph 5.3.3. 4.2.4 Insulation Test: (a) High Potential Test: Reference paragraph 5.3.4. 4.3 Inspection Tests: a contract or purchase order shall be subjected to the following tests: Each lead submitted for acceptance towards fulfillment of 4.3.1 (a) Exami
9、nation of Product: Reference paragraph 5.2. (b) Low Voltage Continuity: Reference paragraph 5.3.3. (c) High Potential Test: Reference paragraph 5.3.4. 5. TEST CONDITIONS: 5.1 Test Requirements: Suitable end fittings duplicating service conditions shall be used whenever practicable during these tests
10、. satisfy the qualifications and inspection requirements as specified to the tests as follows: - The leads shall SAE ARP*BYLA-B U 8353340 0029330 7 m ARP 841A Page 4 5.2 ,Examination of Product: Each lead submitted for qualification or inspection for acceptance under contract or purchase order shall
11、 be carefully exariiined for conformance with the requirements of this specification and/or applicable drawings on which test methods are specified. 5.3 El setrieal Tests : 5.3.1 5.3.2 5.3.3 5.3.4 Joint Resistance: The resistance across the joints between each end connection and the flexible conduit
12、 when measured by means of a suitable low resistance measuring instrument shall not exceed 0.004 ohms. Shielding Kesistance: The resistance of the shielding conduit when heacured by meansof a suitable low resistance measuring instrument shall not exceed 0.003 ohms per foot. Low Voltage Continuity: T
13、he conductor shall be -tested for continuity by applying a low voltage potential difference between the end of the conductor in series with a suitable low voltage indicating device. An alternate method may be BC resistance measurement as specified by the pu rc f i a s e r . High Potential Test: i/ol
14、t;age clasmion shall be applied between the conductor and the shield for a period of 30-60 s without failure. defined by the purchaser.) An alternate test method consists of an AC high potential test at a level of frequency and voltage as specified by tile producer. A RC potential showri below for the particular lead (Failure modes shall be CLASS I 5 kv (Low Vol tage) CLASS II CLASS TI1 15 kv GLASS IV 20 kv CLASS V 30 kv 10 kv (Grade D 8 E only) PREPAIW BY SAE COMMITTEE E-30, PROPULSION IGNITION SYSTEblS
