Part 43: Appendix B - Aircraft Radio Station Inspection

A person referred to in rule 43.59 must—

(1) examine the maintenance records for service history and compliance with the applicable maintenance rules; and

(2) inspect and test the bonding of mounting racks and shock mounts for a maximum resistance of 0.05 ohms; and

(3) inspect and test the complete radio station for interference between items of equipment; and

(4) inspect and test the audio integration and intercom systems to ensure that—

(i) the residual noise level is below -30 dB in the absence of an audio input signal; and

(ii) with input signals of the normal magnitude, the ratio of wanted to unwanted output is not less than 45 dB; and

(5) check that the VSWR of the transmission lines and aerials is less than 3:1 for the following:

(i) VHF Communications:

(ii) HF Communications (Transmitter Receiver to antenna coupler):

(iii) DME; and

(6) check that the system channelling is correct for the following:

(i) VHF Communications:

(ii) HF Communications (Transmitter /Receiver to antenna coupler):

(iii) ILS:

(iv) VOR:

(v) DME; and

(7) inspect and test the VHF Communications system to ensure that the performance of the system is acceptable during normal operation; and

(8) inspect and test the HF Communications system to ensure that—

(i) the antenna integrity and insulation resistance is acceptable; and

(ii) the performance of the system is acceptable during normal operation; and

(9) inspect and test the operation of ADF including—

(i) testing the sense antenna for integrity and insulation resistance; and

(ii) testing the audio function; and

(10) inspect and test the operation of ILS receivers with a field test set, including—

(i) testing flag warnings for modulation failure, centre line and glide path accuracies, sense, and course widths; and

(ii) testing the audio function; and

(11) inspect and test the operation of VOR with a field test set, including—

(i) testing flag warnings for modulation failure; and

(ii) omni-radial resolving, and radio magnetic indicators, accuracy at 30° intervals; and

(iii) carrying out ±1° test for freedom of meter movement, sense, and course width; and

(iv) testing the audio function; and

(12) inspect and test the operation of the marker receiver with a field test set including—

(i) testing operations of 400, 1300 and 3000 Hz tones and associated lamps; and

(ii) where fitted, operation of hi/lo sensitivity; and

(13) inspect and test the operation of DME with a field test set, including—

(i) testing range accuracy and ground speed readings; and

(ii) testing the audio function.