1、MIL- S-78770 20 AUGUST 1956 9 February 1953 MILITARf SPECIJ?ICATION SEATSj PASSENGER, CABIN FOLDING Thig speoifiaation has been approved by the Depariiment of Defense and is mandatoq for uae by the mpartsitjnta of the Use of No. 157 Colors; List of Standard Abcraft Camouflage Licensed by Information
2、 Handling Services3.2 Materials.- , The basic structure of the seat shall be fabricated of metal Wood or other materials which are subject to attack by or an acceptable substitute. mildew or fungus shall not be used in the basic structure. 3.2.1 Protective treatment.- When materials are used in the
3、construction of the seat that are subject to corrosion in salt air or other atmospheric conditions likely to occur during service usage, they shall be protected against such corrosion in a manner that will in no way prevent compliance with the performance requirements of this speci- fication. metal-
4、to-metal contact shall be avoided wherever practicable. The use of dissimilar. metals, as defined in Drawing AND10398, in intimate 3.2.2 Selection of materials.- Specifications and standards for all materials, parts, and Government certification and approval of processes and equipment, which are not
5、 specifically designated herein and which are necessary for the execution of this specification, shall be selected in accordance with ANA Bulletin No. 143, except as pro- vided in the following paragraph. 3.2.2.1 Standard parts.- Standard parts (MS, AN, or JAN) shall be used wherever they are suitab
6、le for the purpose, and shall be identified on the drawing by their part numbers. used, provided they possess suitable properties and are replaceable by the standard parts (MS, AN, or JAN) without alteration, and pravided the corresponding standard part numbers are referenced in the parts list and o
7、n the contractors drawings. In the event there is no suitable corresponding standard part in effect on date of invitation for bids, com mercial parts may be used provided they conform to all requirements of this specification. Commercial utility parts such as screws, bolts, nuts, cotter pins, etc, m
8、ay be 3.3 Design and construction.- 3.3.1 Design.- The seats shall be designed for maximum comfort, mnimum weight, minimum over-all dimensions in both normal and folded position, interchangeability, and shall permit quick installation and removal. 3.3.2 Dimensions.- The outline dimensions of the sea
9、ts shall be as specified in figures 1 and 3. 3.3.3 General structure.- Thermoseal straps, or equivalent, may be used on the The seat and back shall have the maximum developed posture contours, with back and bottom assemblies to form a resilient structure for the back and bottom cushion assemblies. t
10、he use of formed cushions or padding, if desirable. 3.3.4 Construction methods.- Riveting or welding may be used for assembly of component parts fabricated of metals which are suitable for this type of construction. Fittings and joints which will require disassembly of the component parts of the sea
11、t shall be bolted. 3.3.5 Projections.- The inside surface of the seat shall be free from projections to prevent snagging or damage to clothing or seat cushions and upholstery. surfaces of the seat shall be free from sharp edges or any projections which might injure the occupant or damage clothing du
12、ring ingress or egress from seats. shall be provided at front and rear of seat frame to cover leg attachment fitting when leg is folded. 3.3.6 The exterior Individual covers Strength requirements.- The seats shall be used either in a forward or aft facing position and shall have sufficient ultimate
13、structural strength to carry the loads as specified in figures 2, 4, and 5 without failure or excessive deflection. 3.3.6.1 Seats shall take specified loads with legs positioned or folded within limits specified in figures 1 through 5. 3 Licensed by Information Handling ServicesMIL-S-7877B Lb M 7779
14、706 01b243 b . 4 Licensed by Information Handling ServicesMIL-S-7877B 16 9777706 0386244 BELT LOADS- Poo 810 DETAIL A 3400 UNIFORMLY DISTRIDUTEO mxn DACM 1700 UNIF DISTRIDUTLD SEE DETAIL A (a) LOADS SHOWN ARE NOT APPLIED SIMULTANEOUSLY, EXCEPT THAT CORRESPONDING LOAD COMPONENTS APPLIED AT CENTER OF
15、ARMREXT. ON ALL UNITS OF MULTIPLE SEATS ARE To BE APPLIED SIMULTANEOUSLY. SENT PASSENGER INERTIA LOADS ONLY, BASED ON WEIGHT OF 170 POUNDS PER PASSENGER. LOADS SHOWN REPRE- THE WEIGHT OF THE SEAT, MULTIPLIED BY THE APPLICABLE “G“ FACTOR, MUST BE ADDED. . LOADS ARE CHC%J“ IN POUNDS. FIGURE 2. Loading
16、 diagram for double and triple seats Licensed by Information Handling Serviceso- 1.75 TYP. 6.25MIN. 1 FICURE 5. DIMENSIONS FOR SINOLE SEAT PER OACN lm MiFRYLY DISTRIBUTED- PER SEAT FIOURL 4. LOADINO DIAQRAY FOR SINGLE SEAT (a) APPLIED AT CENTER OF ARMRESTS. LOADS SHOWN ARE NOT APPLIED SIMULTANEOUSLY
17、 EXCEPT ARMREST LOADING. LOADS SHOWN REPRE- SENT PASSENGE3 INERTIA LOADS ONLY, BASED ON WEIGHT OF i70 POUNDS PER PASSENGm. THE WEIGHT OF THE SEAT MULTIPLIED BY THE APPLICABLE liGl1 FACTOR MUST BE AT)DED. LOADS ARE SHOWN IN POmbS. -Y ,- 6 V _- Licensed by Information Handling Servicesf- 300 300 2% 76
18、5 -200 - 2000u w ld DETAIL A II 153 O LNIFORMLY DISTRIBUTED PER BACK 1130 UNIFORMLY DISTRIWTED PER L20.00 IN.4 (a) APPLIED AT CENTER OF ARMREST. LOADS SHOWN ARE NOT APPLIED SIMULTANEOUSLY, EXCEPT THAT CORRESPONDING LOAD COMPONENTS ON ALL UNITS OF WTIPLE SEATS ARE TO BE APPLIED SIMLTANEOUSLX. PASSENG
19、EX INERTIA LOADS ONLY BASED ON WEIGHT OF 170 POUNDS PER PASSENGER. OF THE SEAT MULTIPLIED BY THE APPLICABLE “G“ FACTOR MUST BE ADDED. LOADS SHOWN REPRESENT THE WEIGHT LOADS ARE SHOWN IN POUNDS. FIGURE 5. Loading diagram Licensed by Information Handling Services3.3.16, Ba Passenger, Cabin Folding Typ
20、e (MP-1, Mp2, Mp.3, as applicable) Specification MILS-787 7B Manufacturers Part NO. Manufacturers name or trade-mark Month and year of manufacture us 3.8.2 Manufacturerts part No.- The manufacturerts part number marked in the space provided in the nameplate shall be identical with the manufacturers
21、engineering produc- tion drawing number, including applicable dash numbers, if the drawing is tabulated, and covers more than one part. 3.8.3 Use of AN or MJZ designations.- AN or MIL designations shall not be applied to a product, except for Qualification test samples, nor referred to in correspond
22、ence, until notice of approval has been received from the activity responsible for qualifica- tion. 3.9 Workmanship.- The seats, including all parts and accessories, shall be con- structed and finished with good detail and highquality workmanship. 4. WfiTrP ASSURANCE PROVISIONS b.1 Classification of
23、 tests.- The inspection and testing of the seats shall be classified as follows: (a) Qualification tests: Qualification tests are those tests performed on samples submitted for approval as qualified products . (b) Acceptance tests: Acceptance tests are those tests per- formed on individual lots whic
24、h have been submitted for acceptance. 4.2 Qualification tests.- 4.2.1 Sampling instructions.- The Qualification test samples shall consist of one seat of each design 01 modification. Samples shall be identified as required and for- warded to the activity responsible for qualification, designated in
25、the letter of author- ization from that activity. (See 6.3.) 4.2.1.1 When approved by the activity responsible for qualification, the Qualifi- cation tests may be conducted by the seat manufacturer. 4.2. Tests.- The Qualification tests shall consist of all the tests specified under Acceptance tests
26、and, in addition, the following tests. 4.2.2.1 Ultimate load.- The seat shall be mounted in a suitable jig or fixture by utilizing the normal tie down provisions. The seat shallthen be subjected to, and be required to withstand without failure or excessive deflection, the ultimate loads specified in
27、 figures 2, 4, and 5. The point of application of the seat back loads shall. 10 Licensed by Information Handling Servicesbe 22.5 %.l inches above the floor. changed to facilitate testing if the direction of the loads with respect to the seat remains the same. jacks, shot bags, or equivalent high-den
28、sity material, The seat back shall be inclined to the m&wn position during the test. ultimate per lap belt mounting) in a direction inclined 40 degrees forward and up from the bottom of the seat. . For the installation condition specified in figure 5, the load shall be 2,000 pounds ultimate (1,OOO p
29、ounds ultimate per lap belt mounting). The lap safety belt seat fittings shall be subjected to tests in which the loads are applied to a block or frame fitted within the seat and held in place by the belt.attached tothe mount- ings. inward from the seat lap belt mounting at an angle of 70 degrees.wi
30、th respect to a line connecting the two seat lap belt mountings. The attitude of the seat during the test may be The loads may be applied by means of hydraulic or pneumatic press, 4.2.2.2 The lap safety belt shall be loaded to 4,%0 pounds ultimate (2,250 pounds The block or frame shall be so formed
31、as to cause each side ofthe belt to pass 4.3 Acceptance tests.- The Acceptance tests shall consist of &amination of product and the Sampling tests. 4.3.1 &amination of product.- Each seat shall be carqfully examined to determine conformance to this specification and to the manufacturerle drawing wit
32、h respect to material, workmanship, design, standard parts, protective treatment, adjustments, locking mechanisms, dimensions, weight, finish, marking, and general acceptability. Sampling tests.- lii order to insure consistency of manufacture, sufficient seats shall be selected by the Inspector at r
33、andom for subjection to the following tests for interchangeability and strength. 4.3.2 4.3.2.1- Interchangeability.- Conformance to the requirements for interchangeability of component parcs shall be determined by means of suitable jigs and sample parts. subjecting the seat to the loads as spectfied
34、 under 3.3.4 except that proof loads shaii be used instead of ultimate loads. to be 73.4 percent of the ultimate loads. as a result of this test. specimen and subjected to ultimate load tests. 4.3.2.2 Strength.- Conformance to strength requirements shall be determined by The magnitude of the proof l
35、oads shall be considered No pa& of the seat shall show a permanent set One of the first production seats should be taken as a test 4.3.3 Rejection and retest.- Failure of any seat to pass the Sampling tests shall be cause for rejection of the entire lot represented. such failure ia attributable to f
36、aulty workrnanship or other defects not likely to occur throughout the lot, the contractor may test three additional seats, selected at random from the lot. rejection of the entire lot represented. If, in the opinion of the inspector, Failure of any one of these additional seats shall be cause for t
37、he final 5. PREPARATION FOR DELIVERY 5.1 5.2 Application.- The requirements of section 5 apply only to direct purchases by Preservation and packaging.- Each individual seat shall be preserved and Sharp projections of the seat likely to damage the Method M or direct shipments to the Government. packa
38、ged in accordance with Specification MIL-F, Method lC, Without the addition of a contact preservative. barrier shall be padded. fication JAN-F-127. rior container in accordance with Specification JAN-F-108. The padding shall be held in place with tape conforming to Speci- Each preserved seat shall t
39、hen be securely packaged within an inte- 11 Licensed by Information Handling ServicesI- MIL-S-7877B Lb 77777Ob 038b253 5 5.3 Packing.- Each shipping container, insofar as possible, shall contain the the identical number of 8Bets, shall be of a uniform size, and shall be debigned tio enclose the cont
40、ents in a snug, tighbfitting manner. The gross weight of the shipping containef, when packed for shipment, shall not exceed 200 pounds, whenever practicable. otherwise specified, the interior packages shall be packed in cleated-plywood boxes, con- forming to Specification PPbB-601, except that the p
41、lmod shall be type II, clam 2, conforming to Specification N&g15, or in nailed wood boxes in accordance with Speci- Unless I specified in the appendix to the applicable box specification, composed of the followhg information listed in the ordr shount Stock No. ar other identification number as speoi
42、fied WTS* PASSENNOER, CABIN FDLDINO Type MPYI, W2, -3, as applicable) mecification MIbS7877B Manufacturer?s Part No. in, the purchase document% I %NOTE: The cohtractor shall enter the Federal Stock No. specified in the purchase document or as furnished by the proouring activity. When the Federal Sto
43、ck No. is not provided or available from the procuring acfivity, leave space therefor and enter the Stmk No. or othw idefhification as provided by the mocuring actidty. 6.1 Intended useb- ?Phis specification covers a standard, folbinytype passeiiger 6.2 seat for use in &craftr 0rdefi.W dat3.- Procur
44、ement documents should specify the following: (a) Title, number, and date of this specifloation. (b) Type of passenger seat required. (See 1.2.) tested and apprwed for inclusion in the applicabl QualifYeti Woducts Usit -ðer or not auoh paducttr have actually been so listed by that dater 6.3.1 The
45、 attention of suppliers is called -to this requirement, and manufacturers are urged to arrange to have the products that they propbse to bffer t the Meral Government, testeti for qiielificatiun in order that they may be eligible to be awarded contracts or orders for the products covered by this epeo
46、ification. mation pefiaining to qualification of products covered by %his specifioatioh should bc, addressed to the Meau of AeronaufAcs, Airborne Equipment Division, Nav Depa+:.ient, Washington 25, D* drl the activity responsible for qualifiaa%ioh, with a copy to the Comaander, Wright Ab Development Center, WrighGPabterson Air Force Ba?, Ohio. Requests for infor- Licensed by Information Handling ServicesLicensed by Information Handling Services
