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Kit Aircraft Acoustic Educational Info

• Aircraft Acoustics 101

• At a Glance, Making an Aircraft Quieter
  • Baggage Compartment Floor
  • Cabin Floor
  • Center Console
  • Firewall
  • Instruments / Glare Shield / Under Panel
  • Nose Wheel Well & Main Landing Gear Cover
  • Rear Bulkhead
  • Sidewalls & Turtledeck
  • Wing Spar Cover

• Glossary

• Making Templates

• Oshkosh Presentation: Practical Noise Solutions for Aircraft Interiors

• 
• Composites

• About Us
• Consulting
• Contact Us
• Purchase

AT A GLANCE, MAKING AN AIRCRAFT QUIETER

Specific Area Treatments: Sidewalls & Turtledeck

The sidewalls and turtledeck have a lot of area and while generally not as bad acoustically as the firewall, they have huge area. This damping and absorption is very important to controlling noise and will serendipitously add excellent thermal insulation.

This is a rough guide of acoustic treatments for the sidewalls and turtledeck of a typical aluminum or a typical composite 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.

Aluminum Aircraft

Acoustic Level 1 Treatment:

• 1. Dampers covering 50-75% of inside skin between frames and longitudinals.
• 2. Fiberglass and/or foam absorber blankets filling space between frames and longitudinals.
• 3. Cover over frames and blankets with trim panel:
  • a. Trim panel is best made from fire retardant rigid plastic like Kydex (registered trademark of the Kleerdex Company, LLC).
  • b. Isolate trim panel from frame with Hook and Loop fasteners or screws and foam isolation mounts between panel and frame.
  • c. Bond 1/8" gummy damper foam to panel.
  • d. Bond open cell absorber to gummy foam.
  • e. Cover with upholstery leather or fabric to protect foam and for cosmetics.

Acoustic Level 2 Treatment:

• 1. Bond 1/2" closed cell gummy foam against 100% of fuselage side.
• 2. Glue open cell absorber foam filling space between frames and longitudinals.
• 3. OPTIONAL: Cover in upholstery if desired.

Acoustic Level 3 Treatment: (largely for thermal insulation):

• 1. Bond 1/2" closed cell gummy foam against 100% of fuselage side.

Composite Aircraft, No Trim Panel

Acoustic Level 1 Treatment for Aircraft Without a Trim Panel Cover:

• 1. Bond 1/4" – 1/2" gummy damper foam covering entire exposed interior.
• 2. Bond 1/8" - 1/4" open cell absorber to gummy foam.
• 3. Cover with upholstery leather or fabric to protect foam and for cosmetics.

Acoustic Level 2 Treatment for Aircraft Without a Trim Panel Cover:

• 1. Bond 1/8" – 1/4" gummy damper foam covering entire exposed interior.
• 2. Glue 1/8" absorber foam over gummy damper foam.
• 3. Cover with upholstery leather or fabric to protect foam and for cosmetics.

Acoustic Level 3 Treatment for Aircraft Without a Trim Panel Cover:

• 1. Bond 1/4" gummy damper foam covering entire exposed interior.
• 2. Cover with upholstery leather or fabric to protect foam and for cosmetics.

Composite Aircraft, with Trim Panel

Acoustic Level 1 Treatment for Aircraft With a Trim Panel Cover:

• 1. Bond 1/4" – 1/2" gummy damper foam covering entire exposed interior.
• 2. Make fiberglass blanket to fill cavity behind trim panel.
• 3. Add trim panel and isolate from fuselage with Hood and Loop or isolation tape.
• 4. Cover trim panel with 1/8" gummy damper foam and 1/8" absorber foam.
• 5. Cover with upholstery leather or fabric to protect foam and for cosmetics.

Acoustic Level 2 Treatment for Aircraft With a Trim Panel Cover:

• 1. Bond 1/4" gummy damper foam covering entire exposed interior.
• 2. Make fiberglass blanket to fill cavity behind trim panel.
• 3. Add trim panel and isolate from fuselage with Hook and Loop or isolation tape.
• 4. Cover trim panel with 1/8" gummy damper foam.
• 5. Cover with upholstery leather or fabric to protect foam and for cosmetics.

Acoustic Level 3 Treatment for Aircraft With a Trim Panel Cover:

• 1. Bond 1/4" gummy damper foam covering entire exposed interior.
• 2. Add trim panel and isolate from fuselage with Hook and Loop or isolation tape.
• 3. Cover trim panel with 1/8" gummy damper foam.
• 4. Cover with upholstery leather or fabric to protect foam and for cosmetics.