Commonwealth legislation

AD/DC3/27 - Crew Compartment Acoustic Treatment - Restoration

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legislative instrument

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This directive requires operators of all Douglas DC‑3 models operating in Papua New Guinea to install sound‑attenuating treatment in the crew compartment so in‑flight noise does not exceed levels measured in original-condition DC‑3s (no more than 90 dB in any of the four octave bands 300–600, 600–1200, 1200–2400 and 2400–4800 Hz at a point midway between the pilots’ heads). Compliance is required forthwith; operators pay for and choose a “suitable” treatment and must demonstrate compliance by measurement.

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AD/DC3/27 - Crew Compartment Acoustic Treatment - Restoration

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Douglas DC3 Series Aeroplanes

AD/DC3/27 Crew Compartment Acoustic NK Treatment - Restoration

Applicability: All models operating in Papua New Guinea.

Requirement: Carry out suitable sound attenuating treatment of the crew compartment to achieve a sound pressure level not greater than that experienced in DC3 aeroplanes in their original condition.

Note: Measurements of the sound pressure level in a number of DC3 aeroplanes in their original condition show that 90 db (re 0.0002 dyne/sq.cm.) is not exceeded in any of four octave bands 300-600, 600-1200, 1200-2400 and 2400-4800 cycles/second when in flight at normal cruise power settings, the measurements being at a point midway between the pilots’ heads.

Compliance: Forthwith.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.