AD/DC3/27 - Crew Compartment Acoustic Treatment - Restoration
1AD/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.