1、- ML-S-7886B 13 MARCH 1962 SUPERSEDING DATA (SEE 6.4) MILITARY SPECIFICATION SPARK PLUG, SHIELDED, AIRCRAFT RECIPROCATING ENGINE, GENERAL SPECIFICATION FOR This specification has been approved by the Department of Defense and .is mandatory for use by the Depat*tments of the Army, the Navy, and the A
2、ir Force. 1. SCOPE MIGP-3803 - Plastic, Polyethylene, Molded anid Ex- 1.1 This specification covers aircraft reci- truded Shapes, Sheets, and Tubing. proeating engine spark plugs. 2. APPLICABLE DOCUMENTS MIL-G-5572 -Gasoline, Aviation : Graldes 80/87. 9 i/ 19 6, 100/30; 2.1 The following documents,
3、of the issue 11 5/145. in effect on date of invitation for bids, form a part of this specification to the extent meci- M.IG0-6081 - Oil ; Lubricating Jet fied herein: - Engine. SPECIFICATIONS FEDERAL PPP-C-96 -Cans, Metal, 28 Gage PPP-B-636 - Box, Fiberboard. PPP-B-665 - Boxes; Paperboard, Metal Sta
4、yed (In- cluding Stay Mate- rial. and Lighter. MILITARY MILP-116 - Preservation, Methods of. MILL6082 - Lubricating Oil ; Air- craft Reciprocating ( Pigton) Engine. MIGC-6529 -Corrosion Preventive, Aircrat Engine. MILS4742 - Screw Threads, Btm- dard, Optimum Be lected Series; Gen- eral Specification
5、 f os. Mtical, Pre- paration for Deli- very. Licensed by Information Handling ServicesMILE-25111 -Engines, Aircraft, Reciprocating, Qualtification Tests for, STANDARDS MILITARY NILSTD-10 -Surface Roughness, Waviness, and Lay. MILSTD-129 - Mmking for Shipment and Storage. MIL-STD-414 - Sampling Proce
6、dures and Tables for In- spection by Vari- ables for Percent Defective. AIR FORCE-NAVY AERONAUTICAL AN402T - Gasket - Spark Plug. (Copies of specifications, standards, drawings, and publications required by contractors in connection with specific procurement functions should be ob- tained from the p
7、rocuring activity or as directed by the contracting officer.) 3. REQUIREMENW 3.1 Detail requirements for applic;ition. Detail requirements applioable to spark plugs for particular AirfTame-engine combinations shall be as specified in the detail specifica- tions listed in Supplement 1 to this specifi
8、- cation. In the event of any conflict between requirements of Ithis specification and the detail specifications, the latter shall govern. 3.2 Qualification. Spark plugs furnished under this specifioation shall be a product which has been tested and has passed the qualification tests specified in 4.
9、3, and has been listed on or approved for listing on the applicable Qualified Products List (see 6.3). 3.3 Materials. Materials shall be suitable for the purpose intended. 3.4 Design and construction. Spark plugs shall conform to figure 1 or 2, m applicable. Spark plugs shall be so designed that cle
10、an- ing can be accmplished without disassembly, using conventional ;types of aircraft spark plug cleaners, methods, and praotices, and that resetting of the gaps can be accom- plished with a gap-setting tool acceptable to the procuring aotivity. Spark plugs shall be so constructed as to withstand th
11、e normal strains, jars, vibrations, and euch other con- ditions as are incident to shipping, storage, installation, and service usage without failure. 3.4.1 Spa?*k gap. Only one no.mina1 gap setting with specified limits shall be per- mitted for each part number. 3.4.2 Gasket. Each spark plug shall
12、be fur- nished with a gasket in iaccoi:dance with Standard AN4027. 3.5 Performance. Spark plugs shall operate satisfactorily when subjected to the perfor- ance tests speci:ed in 4.7 and 4.8. 3.6 Identificatim of product. The following information shall be permanently and legibly marked on the exteri
13、or surface of each spark plug : Manufacturers name or trademark, date of manufacture (month and year), spark plug pad number, and latest change letter. 3.7 Workmanship and finish. Spark plugs shall be clean and free from dirt and metal chips or other foreign matter, both external- ly and internally.
14、 There shall be no loose pai%, imperfect weldments, burrs, sharp edges, dents, cracks, or other defects or ir- regularities. 4. QUALJPY ASSURANCE PROVISIONS 4.1 Inspection responsibility. The supplier is responsible for the performance of all in- pection requirements as specified herein. Ex- cept as
15、 otherwise specified, Che supplier may Licensed by Information Handling ServicesMAX FLAT .O.% PERMISSIBLE A COmm 8SHELLHn)( O DIAMSTER SIIALL BE LESS THAi DISTANCE ACROSS FIATS OF SHELL HEX (OR CORE Hx IF USED) I II I KIOi1 DIA .6358 HAX SURFACE IF3FUIARTTIES OF W4D FLNiiS SMU BOT EXCEED A ROUGHTESS
16、 HEIOKT RATMG OF E SURFACES S HA L BE LLELWITHIN .O15 BE SMOTH AND FLAT TYPES 3 AND and informa- tion pertaining to qualification of products may be abtained as specified therein. 6.3.1 Qualified Products List (QPL). Spark plugs whlch are suitable far a par- ticular airf rame-engine combination will
17、 be listed in the applicable supplemental speci- fication, QPL (see 3.1). 6.4 Superseding data. Thi,s specification supersedes Specifications MIL-P-007886A- Licensed by Information Handling ServicesMILS-7886B (USAF) dated 22 April 1957, MIL-P-7886 dated 19 March 1952, MIL-S-8829 (Aer) dated 19 May 3
18、959 and Standards MS24471 dated 18 June 1957, MS24472 dated 15 Au- gust 1958, MS24473 dated 15 August 1958, MS33508 dated 28 March 1952, AND10206 dated 28 March 1952, AND102,17 dated 30 January 1945, and AND10219 dated 30 January 1945. 6.5 Detail specification. The detail specifi- cation should specify the performance re- liability requirements and test procedures for the detail engine-airframe flight tests (see 4.8). I?r U. S. GOVERNMENT PRINTING OFFICE: 611074-196Z-(Z-127): Licensed by Information Handling Services
