62-13-01 ANDREA RADIO CORPORATION: Amdt. 447. Part 507 Federal Register June 1, 1962. Applies to All Aircraft Equipped With Intercommunication Sets Models AN/AIC-10A and AN/AIC-18(A-81), Except Those With Control Panel Serial Number 332 and Subsequent.
Compliance required as indicated.
Within the next 200 hours' time in service after the effective date of this airworthiness directive unless already accomplished, modify Model AN/AIC-18(A-81) in accordance with Andrea Radio Corporation Field Modification C41-5115 and Model AN/AIC-10A in accordance with Andrea Radio Corporation Field Modification C41-5116, so that the adjustable attenuation range does not exceed 10 decibels.
When the modification has been completed add marking "MOD" adjacent to the TSO-C50 label.
Within the next 10 hours' time in service after the effective date of this airworthiness directive unless already accomplished, as an interim procedure pending modification, install a placard requiring that the master level control on the isolation amplifier be full "ON" at any time range problems are being worked.
(Andrea Radio Corporation Field Modification C41-5115 for AN/AIC-18(A-81) and C41-5116 for the AN/AIC-10A, both dated April 5, 1962, cover this same subject.)
This directive effective June 1, 1962.