AFGS�87219B APPENDIX A
open to provide isolated generator operation only for certain fault conditions. Opening was automatic-no crew control was provided. During flight testing it was discovered that faults on the paralleled system could produce excessive voltage transients on all buses before the BTCs could open. This was corrected by automatic control.
b. Switching of one essential bus from the emergency generator back to the main generator was changed from automatic to manual to give the crew better control of an abnormal situation.
c. The use of a multiplexed data bus for load control signals and related data proved to be a successful approach on the B-1 aircraft. A significant reduction of wiring weight and volume was achieved.
d. Multiple wire feeders for the essential bus of one aircraft have been instrumental in maintaining electrical power under emergency conditions. Attempts to remove this capability during modification programs were met with great resistance from the user community.
A.4.2.8 Control and protection.
Compliance with the EPS control and protection requirements of 3.2.8 shall be verified as follows: .
VERIFICATION RATIONALE (A.4.2.8)
Analyses and tests are the appropriate means of verifying compliance with this requirement.
VERIFICATION GUIDANCE
a. Initial verification of control and protection requirements can be accomplished by circuit analyses, including analyses of failure modes and effects.
b. Qualification testing will verify that the control and protection requirements of individual components are met.
c. Performance of the complete subsystem can be verified by laboratory and vehicle testing.
43
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business