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|  MIL-D-81347C(AS)
(4) When previously produced models of this equipment did not
use repairable subassemblies, the design shall not be changed to employ nonrepairable assemblies
without the approval of the procuring activity.
Nonstandard Parts and Materials Approval - Approval for the
3.2.1
use of nonstandard parts and materials (including electron tubes, transistors and diodes) other than
microelectronic devices shall be obtained as outlined in Specification MIL-E-5400. Microelectronic
devices shall be approved as outlined in WR-101, Part II, Amendment 1.
Electron Devices - Transistors and diodes shall be chosen and
3.2.2
applied as outlined in Specification MIL-S-19500 and MIL-STD-701.
Maintenance Modules - The electronic portions of the equipment
3.2.3
shall be divided into maintenance modules as defined in 3.3.7.2.1.
Design and Construction - The equipment shall conform with all
3.3
the applicable requirement specification MIL-E-5400 for design, construction and workmanship,
except as otherwise specified herrein
*3.3.1
Total Weight - The total weight of the DPS equipment shall be
minimum consistent with good design and shall not exceed 776 pounds.
Reliability
3.3.2
Reliability Program - The contractor shall establish and con-
3.3.2.1
duct a reliability program in accordance with MIL-STD-785.
Operational Stability - The equipment shall operate with satis-
3.3.2.2
factory performance for the life of the equipment without the necessity for readjustment of any control,
which are inaccessible to the operator during normal use.
Operating Life - The equipment shall have a total operating life
3.3.2.3
of 50,000 hours with reasonable servicing and replacement of parts. Parts requiring scheduled re-
placement and the replacement interval shall be specified by the contractor.
Specified Mean-Time-Between-Failures (MTBF) - The specified
3.3.2.4
Mean-Time-Between-Failures (MTBF) for tiheb respective units of Data Analysis Programming Group
AN/AYA-8B when tested and accepted as outlined under the requirements of 4.4.3 shall be as follows:
800 hours
Logic Unit 1
800 hours
Logic Unit 2
800 hours
Logic Unit 3
600 hours **
Logic Unit 4
110 hours
Universal Keyset
440 hours
Pilot's Keyset
270 hours
Ordnance Panel
930 hours
Armament/Ordnance Test Panel
**(The Drum subassembly of the Magnetic Drum
Memory requiring depot maintenance shall
have an MTBF of 1500 hours or greater.)
Time Totalizing Meter - The equipment shall contain time
3.3.2,5
totalizing meters in accordance with Specification MIL-M-7793. A time totalizing meter type
MS-17322-6A shall be included in each separate item, except panels and keysets. Logic Unit 4
shall have two meters. In Logic Unit 4 a separate meter shall be supplied for the Magnetic Drum
Memory subassembly of the Drum Auxillary Memory Subunit.
4
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