AFGS�87219B APPENDIX A
c. The ability to keep the battery charged without excessive heating or overcharging should be demonstrated for the required operational profiles and environmental conditions.
d. The battery system should also be included in the laboratory and aircraft testing of the complete EPS.
VERIFICATION LESSONS LEARNED (A.4.2.9.2)
Battery systems which incorporate a charger have experienced operational problems as a result of inadequate laboratory testing of the integrated system. The battery and charger are often procured from different vendors with little or no system testing before their installation in the aircraft. Costly incompatibilities have arisen which could have been precluded by more complete laboratory testing.
A.3.2.9.3 Generators.
Generator systems shall be in accordance with ------------.
REQUIREMENT RATIONALE (A.3.2.9.3)
The design and performance of the generator system are essential contributors to the overall performance of the EPS. The fundamental subsystem power parameters of voltage, frequency, and capacity are established primarily by the main generators and associated components.
REQUIREMENT GUIDANCE (A.3.2.9.3)
a. Constant frequency 400 Hz power can be obtained from a constant speed generator driven directly from a prime mover when the prime mover operates at fixed speed. Generator systems of this type should be in accordance with MIL-PRF-21480B with changes as necessary for the specific application.
b. When the prime mover operates at varying speeds, either of two types of generator systems can be used for producing constant frequency power. One approach is to use a constant speed drive between the prime mover and the generator. The airframe contractror or drive manufatur should define the performance and quality assurance requirements. Older systems may reference the canceled MIL-D-83029. The second approach is to drive the generator directly from the prime mover at varying speed and convert the variable frequency produced by the generator to constant frequency by means of an electronic converter. MIL-E-85583 should be specified for systems of this type. Older systems may reference the canceled specification MIL-E-23001.
c. Generators in accordance with MIL-DTL-6162 are suitable for 28 volt DC systems. d. Generator system capacity is often limited by the amount of cooling available.
Therefore particular attention should be given to this aspect of the installation.
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