Product Improvement Analysis, F-4D Fire Control System, Revision.
Abstract
This study revealed that the main contributor to the low availability of the F-4D Fire Control System is electrical instability, a failure mode responsible for about half of all maintenance actions of the system. The design of the FCS is such that even minor changes or fluctuations in component values induced by the operating environment result in significant changes to the output signal. This problem can be corrected by modifications that would not affect present LRU interfaces. Modifications representative of the type needed are recommended in this report. A related availability problem is associated with FCS calibration. System calibration may be difficult to confirm and maintain under existing policies. The accuracy of calibration can be determined only while the system is being operated under dynamic conditions. Each time the system is accessed, e.g., for the repair or replacement of subsystems or components, many electrical parameters are affected, the system must once again be calibrated, and then placed into full operation before the calibration can be comfirmed. Maintenance policies must stress system harmonization and discourage system perturbation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1972
- Accession Number
- ADA054692
Entities
People
- J. P. Ford
- K. J. Braman
- L. J. Larsen
- M. J. Hutton
Organizations
- ARINC