Honeywell KMA28 Post Installation Checkout, Unit Installation, Operational Checkout

Bendix/King

KMA28

Audio Amplifier/Intercom/Marker Beacon Receiver

2.10Post Installation Checkout

After wiring is complete, verify power is ONLY on pin 20 of the J1 (bottom connector), and airframe ground on bottom connector pin Z. Failure to do so will cause serious inter- nal damage and void the warranty.

2.11Unit Installation

To install the KMA 28, gently slide the unit into the mounting rack until the hold-down screw is engaged. While applying gentle pressure to the face of the unit, tighten the 3/32" hex-head in the center of the unit until it is secure. DO NOT OVER TIGHTEN.

Warning: Do not over-tighten the lock down screw while installing the

unit in tray. Internal damage will result.

2.11.1 Operational Checkout

1.Apply power to the aircraft and avionics. Switch on the unit by pressing the volume knob.

2.Plug headsets into the pilot, copilot, and occupied passenger positions.

3.Rotate the Mic Selector Switch to the Com 1 position.

4.Verify that the Com 1 button lights. Verify that the green transmit LED (Light Emit- ting Diode) near the mic selector is not illuminated. If the LED is on, stop testing and troubleshoot the microphone PTT installation.

5.Verify proper transmit and receive operation from the copilot position, noting that the copilot PTT switch allows proper transmission on the selected transceiver.

6.Verify that pushing the COM 2 button causes the button to illuminate, and the Com 2 receiver to be heard. Verify operation on Com 1 from the pilot position.

7.Repeat for Com 2 and Com 3, (if installed).

8.Rotate the mic selector switch to the COM 1/2 position. Verify that the pilot commu- nicates on Com 1 and the copilot on Com 2.

9.Rotate the mic selector switch to the COM 2/1 position. Verify that the pilot commu- nicates on Com 2 and the copilot on Com 1.

10.Rotate the mic selector switch to the TEL position. Verify that the pilot headset is connected to the cellular telephone system (if installed). Verify that by using the pilot side PTT, the pilot can transmit on Com 1. The copilot has no transmit capability in TEL mode.

11.Verify proper operation of all receiver sources by selecting them using the button. Note that the button for the receiver sources stays in, and the button illuminates to show which source is in use.

12.Push in the SPR button. Verify that all selected audio is heard in the cockpit speaker. Verify that the audio mutes when the mic is keyed.

13.Verify that the LED in the lower right side illuminates when either push to talk is keyed.

14.Verify proper Intercom system operation in the ALL, ISO and CREW modes (see Ta- ble 3-1).

006-10565-0000 Page 2-10 Rev. 0, Sept. 2000