Approval basis – faa- tso c50c, 4 specifications – PS Engineering PMA4000 Installation Manual User Manual

Page 5

PS Engineering

PMA4000 Series Audio Selector Panel and Intercom System

Installation Manual

200-041-0002 Page

1-2

Rev 5, March 2007

APPROVAL BASIS – FAA- TSO C50c

The PMA4000 p/n 11942, Audio Selector Panels are FAA approved under TSO C50c (Audio Amplifiers).

All systems comply with relevant portions of EUROCAE ED-14C/DO-160D (Environmental Condi-
tions and Test Procedures for Airborne Equipment), ED12B/DO-178B (Software Considerations for
Airborne Equipment) and ED- 18/DO-214 (Audio Systems Characteristics and Minimum Operational
Performance Standards for Aircraft Audio Systems).
Operation is subject to the following conditions:

1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may cause undesired

operation.

The part number 11941 unit is NOT FAA Approved.

1.4 SPECIFICATIONS

ENVIRONMENTAL Qualifications:

B1CABSRXXXXXXABBBBTMXXE2XXX

Temperature Range:
Operating:
Storage

-20ºC to +55ºC
-40ºC to +85ºC

Altitude:

Up to 25,000 feet in an unpressurized area of the cock-
pit.

Audio Selector/Intercom:

C50c, Class A

APPLICABLE DOCUMENTS:

RTCA/DO-214, RTCA/DO-160D

DIMENSIONS:

Height: 1.35 in. (3.4 cm) Width: 2.40 in. (6.1 cm)
Depth: 6.50 in. (16.5 cm) behind panel

WEIGHT (With Connectors):

12.4 oz. (0.35 kg)

Voltage:

11 to 33 VDC (28 Volt w/dropping resistor)

Maximum Current:

0.25 Amp (Externally protected by a 3 Amp circuit
breaker.)

Typical operating current:
Speaker off:
Speaker on, 28V, full radio volume

100 mA
250 mA

Audio Selector Specifications

Audio selector panel input impedance:

510

Ω

Input Isolation:

-60 dB (min.)

Speaker Muting:

-60 dB (min.)

Speaker Output (into 4

Ω) with no clipping

14 VDC:
28 VDC:

2 Watts (min.)
8 Watts (min.)

Receiver Inputs:

4 (Com 1, Com 2, Nav 1, Nav 2)

Unswitched Inputs:

4 (examples: ADF, DME. GPS WPT, Marker, Autopi-
lot Disconnect, Altimeter DH)

Transmitter Selections:

2 (Com 1, Com 2)

Speaker Impedance:

Ω

Headphone Impedance:

150 – 1000

Ω

Headphone Output:

30 mW each headset, with < 10% THD into 150

Ω

Microphone Impedance:

150 - 600

Ω

Intercom Specifications

Intercom Positions:

4 places (with individual IntelliVox® circuits)

Music Input: 1

(Monaural)

Music Muting:

>-30 dB "Soft Mute"

Distortion:

<1% THD @ 30 mW into 150

Ω

Mic Freq. Response,±3 dB:

300 Hz - 6000 Hz

Music Freq. Response,± 3 dB:

100 Hz - 18kHz

1.5

EQUIPMENT SUPPLIED

1 ea. of the following units: