AFGS�87219B APPENDIX A
e. Other guidance concerning the design and installation of generator systems is provided by AFSC Design Handbook DH 2-3.
REQUIREMENT LESSONS LEARNED (A.3.2.9.3)
a. Oil-cooled, oil-lubricated generators have proven to be smaller, lighter and more reliable than their air-cooled, grease-lubricated predecessors.
b. Constant speed drive oil level has been critical to satisfactory operation on various aircraft. Furthermore, filling to the proper level has been adversely affected by temperature, aircraft attitude and inadequate oil level indication. New designs should be less critical with respect to oil level and should provide for simple and accurate filling and inspection procedures. The drive must be capable of operation under all specified "g" conditions over the entire range of specified oil levels.
c. When an external oil cooler is used in a generating system, it should be protected against contamination from the generating system by an outlet or scavenge filter. On one aircraft, when an Integrated Drive Generator (IDG) had a hardware failure, metal could and did contaminate the oil cooler, which meant the cooler had to be replaced. An Engineering Change Proposal (ECP)for a scavenge filter was later approved and added to the system.
A.4.2.9.3 Generators.
Compliance with the requirements of 3.2.9.3 shall be verified by analyses, tests, and inspection as follows: _.
VERIFICATION RATIONALE (A.4.2.9.3)
Experience has shown that system analyses, component qualification tests, and integrated EPS
subsystem tests and inspections are required to verify performance of the generator system.
VERIFICATION GUIDANCE (A.4.2.9.3)
a. Analyses appropriate for the generator system include electrical load analyses, functional analyses, failure mode and effect analyses, hazard analyses and reliability analyses.
b. Individual components should be qualification tested and inspected to their particular specification requirements.
c. The generator system should be tested as a component of the EPS in mockup testing and tested and inspected after installation in the vehicle.
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