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Specific Area Treatments: Instruments / Glare Shield / Under Panel
The glare shield may add rattles if too loosely attached. But if treated with dampers and absorbers, it can absorb and reduce reflected sound emanating from the windscreen plus may block some noise from the firewall.
This is a rough guide of acoustic treatments for the glare shield area of a typical light aircraft. The actual results may differ from aircraft to aircraft since this by necessity must be a generalization of typical noise path and vibration common to most light aircraft. Some aircraft may be limited by space, clearances, internal volume, and contact with the pilot and passengers that therefore must be taken into account
Level 3 provides basic coverage and Level 1 offers the most insulation.
Acoustic Level 1 Treatment:
- 1. Isolate panel and glare shield from frame with 1/16" - 1/8" isolation mounting tape or "gummy" foam strips, (do not over tighten bolts).
- 2. Place absorbing foam in as much open space as possible leaving enough room for cooling air.
- 3. Cover glare shield with 1/4" felt and upholster over that with black cloth or leather.
Acoustic Level 2 Treatment:
- 1. Isolate panel and glare shield from frame with 1/16" - 1/8" isolation mounting tape or "gummy" foam strips, (do not over tighten bolts).
- 2. Cover glare shield with 1/8" felt or 1/4" foam and upholster over that with black cloth or leather.
Acoustic Level 3 Treatment:
- 1. Isolate panel and glare shield from frame with 1/16" - 1/8" isolation mounting tape or "gummy" foam strips, (do not over tighten bolts).
- 2. Cover glare shield with 1/8" closed cell gummy foam and upholster over that with black cloth or leather.
