Evaluation of A-7E Aircraft Thermal Radiation Closure for Light Leakage,
Abstract
Tests detailed in this report were conducted by the Naval Weapons Evaluation Facility to evaluate effectiveness of thermal radiation closure (TRC) modifications developed by LTV to eliminate light leaks defined during BIS-A7E-03 nuclear weapons trials. Leakage evaluations were made before TRC modification, after TRC modification, and following 100 repetitive TRC actuations. Results indicated that the modification did eliminate leak paths present at corners of the cowling, but high-transmissivity areas exist along the interface between the aft movable segment and the fixed segment which are not considered in the modification. Further, pinpoint light leaks were observed at the HUD cowling interface which allowed light to shine directly into the pilot's eyes, a most undesirable situation. Measurements of ambient light levels in the cockpit were well within specification in spite of the high transmission areas along the fixed segment interface. It was demonstrated that a seal along this interface can reduce transmitted light to specification tolerances. Through proper seal installation and elimination of light leaks from sources other than the TRC, the level of all light transmitted to the cockpit area can be brought within specification tolerances. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 20, 1971
- Accession Number
- ADA044163
Entities
People
- James E. Fordice
- Lawrence L. Langdon