Part of: INTERPHONE-RADIO CONTROL SYSTEM (AN/AIC-14)
Transmitter selector panels are located at the pilot, co-pilot, TACCO and SENSO/sonar operator stations and control ICS and radio transmissions for those stations. The hoist operator’s station does not have a transmitter selector panel and can transmit on ICS only. Each panel marked “RAD” (Figure 1-10-3), consists of an ICS switch with positions ON and OFF, a volume control marked “RAD VOL” and a transmitter selector knob marked “TRANS SEL”, having 12 positions – ICS and 1 through 11. The function of controls are as follows:
The ICS ON/OFF switch controls the incoming ICS signals and is used in conjunction with the ICS master control panel. When the ICS ON/OFF switch is in the OFF position, only radio signals can be heard. If the MIC SEL switch of the ICS master control panel at any of the crewstations is placed to CALL, the ICS ON/OFF switch is bypassed.
The TRAN SEL switch utilizes positions: ICS for transmission on ICS only, 1 for UHF, 2 for HF, 3 for underwater communication with the sonar set, 4 for VHF/AM, and 5 for VHF/FM. The remainder of the positions are not functional. If the switch is placed to ICS, that station can only transmit on ICS regardless of the microphone switch used.
The RAD VOL control adjusts the level of the radio and sonar signals received at each station as selected on the receiver selector panel.
Ref: C-12-124-A00/MB-000, Aircraft Operating Instructions CH124 Sea King Helicopter, Ch 3 – 2003-03-28, page 1-10-2
