MIL-STD-1822A(USAF) APPENDIX A
A.3.6.4 CTU-4.
The CTU-4 has some WR components and some simulated components. The WR components do not have the same quality (pedigree) as the WR components found in the CTU-1, CTU-2, or CTU-3. The CTU-4 is an unclassified tool that is packaged in a suitcase for portable use. This unit provides good weapon functionality and electrical loads but it is not ideal. The CTU-4 is used during preliminary AMAC tests, lab tests, and on AMAC systems that have minor nuclear software changes.
A.3.6.5 W80-1 PREARM load simulator (PLS).
A W80-1 PREARM load simulator (PLS) is unclassified and is used in place of a W80 warhead on ALCMs to simulate the electrical load and functional portions of the warhead during pre- launch operations. The PLS is flight certified. These units, used in conjunction with the W80-1
CTU-1, allow test engineers to conduct a 20 missile PREARM test on the B-52H aircraft. Its small size (2 x 6 in) allows it to be used with USAF training/ferry payloads when flight or ground tests are required.
A.3.6.6 Development joint test assembly (DJTA).
This is a test unit that is used in a full system demonstration drop test in order to exercise the end-to-end DoD Command and Control system and aircraft functions such as mission planning, PAL, weapon loading, and delivery to the target. SNL and the NNSA provide a bomb test unit that, as nearly as possible, duplicates the features of a WR bomb. It is not necessarily pulled directly from the stockpile. DJTAs are also used for other types of testing.
A.4 Surveillance testing.
The AFNWC/NCS has implemented and manages a "Surveillance Test Program". Surveillance testing is a quantitative assessment of the Aircraft Monitor and Control (AMAC) system in nuclear capable aircraft; the major test objective is to acquire engineering measurements of aircraft-weapon interface signals. The engineering parameters measured during surveillance testing are compared with design specifications and monitored over time for performance degradation that may impact the system's Nuclear Compatibility Certification. Surveillance testing provides direct System 1 (System 2 in the future) specification comparisons, isolation tests, DC voltage measurements, continuity measurements, time critical measurements, and open circuit, short circuit, and load current tests. Surveillance testing is conducted using the AFNWC/NCS developed Special Weapons Interface Tester (SWIFT). Surveillance testing directly supports Operational-Suitability as established in AFI 63-1201.
A.4.1 Surveillance tests methodology.
The purpose of AMAC surveillance testing for each weapon system is to monitor changes in the baseline for each system that would indicate a design issue created by aging, aircraft modification, or a combination thereof. The required test sample size for each weapon system shall meet a statistical confidence of 90 percent probability that a defect which appears in no more than ten percent of the interfaces will be detected over a two-year period. A hyper- geometric mathematical-probability model determines the number of an aircraft type to be tested based on the number of stations in the fleet that are available to a specific weapon system. To achieve the necessary statistical confidence, the hyper-geometric probability model prescribes the following sample sizes based on the number of stations in the fleet available to that type of aircraft:
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