PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0010
Page 1-2
Rev. 29, Sept. 2021
The Duplex Telephone mode (COM 5) allows the PAC24 to act as an audio interface between aircraft
headphone and microphones and specific aircraft approved (FAA/FCC) cellular telephone equipment.
Warning
: Use of non-aviation approved cellular telephone equipment may be prohibited by regulation.
PS Engineering is not responsible for unauthorized airborne use of cellular telephones.
For airborne use, the PAC24 must be interfaced with an approved system.
A fail-safe mode connects the pilot headphone and microphone to COM 1 if power is removed for any rea-
son, or if the power switch is placed in the Off (Fail-safe) position.
A voice activated (VOX) intercom is included in the PAC24. This system has PS Engineering’s exclusive
IntelliVox®
circuitry that eliminates manual adjustments. The system contains five independent VOX mic
circuits, and only opens the specific microphone channel in use.
The intercom system incorporates pilot isolate (ISO) and ALL modes. A crew mode is ONLY available
with external expansion module P/N 11606.
A dual volume controls intercom level for the pilot, inner knob, and copilot/passengers (outer knob). Inter-
com squelch is automatic.
The PAC24 is form fit and function compatible with the King Radio KMA24H, part number 066-1055-71,
and may be compatible with 066-1055-70 depending on application.
1.4
APPROVAL BASIS -
FAA-TSO Approval
.
The PAC24 Audio Selector Panels are FAA approved under TSO C50c (Audio Amplifiers). In addition, the
PAC24 is JAA-JTSO approved under LBA.N-O.10.510/003JTSO.
All systems comply with relevant portions of EUROCAE ED-14C/DO-160D (
Environmental Conditions and Test Pro-
cedures 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 Sys-
tems
).
Operation is subject to the following conditions:
This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause undesired opera-
tion.
1.5
SPECIFICATIONS
TSO COMPLIANCE
Audio Selector/Intercom
:
C50c, Class A
APPLICABLE DOCUMENTS:
RTCA/DO-214
RTCA/DO-160D
RTCA/DO-178B
ENVIRONMENTAL Qualifications:
B1ZCABSRXXXXXXZBBBATMXXE2XXX
Temperature Range:
Operating:
Storage:
-20ºC to +55ºC with short term operating at +70°C
-55ºC to +85ºC
Altitude
:
Up to 50,000 feet in a non-pressurized area of the
cockpit.
DIMENSIONS:
Height: 1.3 in. (3.3 cm) Width: 6.25 in. (16.9 cm)
Depth: 6.8 in. (17.3 cm) behind panel
WEIGHT (With Rack & Connectors):
1.5 lb. (0.54 kg)