PS Engineering
PAC45T Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-045-5100
Appendix F
Rev. 2, Jan. 2019
Appendix F – Instructions for FAA Form 337 and continuing airworthi-
ness
10.1 Instructions for FAA Form 337, Audio controllers
One method of airworthiness approval is through an FAA Form 337,
Major Repair and Alteration (Airframe, Powerplant, Propel-
ler, or Appliance)
In the case of the PAC45T, you may use the following text as a guide.
Installed audio selector and 6-place intercom, PS Engineering PAC45T, part number 050-045-(XXXX) in (
locations
) at
station . Installed per
AC43.13-2, Chapter 2, paragraph 23
(Instrument Panel Mounting). Installed per PS Engineering
Installation Operators Manual
p/n 200-045-(XXXX), revision (), dated ( ).
These units are FAA-Approved under TSO C139A for audio amplifiers, and meets environmental qualifications outlined
in RTCA DO-160G as appropriate or this aircraft.
Interface to existing aircraft radios in accordance with installation manual and in compliance with practices listed in
AC43.13-2
, Chapter 2. All wires are Mil-Spec 22759 or 27500. Connection to aircraft dimmer bus is
____________________. Power is supplied to the unit through a 5A circuit breaker (type and part number), and total elec-
trical load does not exceed % of the electrical system capacity with the PAC45T added.
Aircraft equipment list, weights and balance amended. Compass compensation checked. A copy of the operation instruc-
tions, contained in PS Engineering document 202-045-( ), revision ( ), dated ( ), is placed in the aircraft records. All work
accomplished listed on Work Order
.
10.2 Instructions for Continuing Airworthiness, Audio System
Sample ICA Checklist for PS Engineering PAC45T Audio System:
Section
Item
Information
1
Introduction
Installation of audio control panel with intercommunications system, with inte-
grated audio alert system.
2
Description
Installation as described in manufacturer’s installation manual referenced on in-
stallation documentation (FAA Form 337, etc.), including interface with other
avionics audio as required.
3
Controls
See installation and operator’s guide referenced on installation documentation.
4
Servicing
None Required
5
Maintenance Instructions
On Condition, no special instructions
6
Troubleshooting
In the event of a unit problem, place the unit into “off,” “fail-safe” and/or
“emergency” mode. This allows pilot communications using UHF, and un-
switched audio for critical alerts, copilot communications on VHF. Follow
checkout instructions in the installation manual referenced on the FAA Form
337. For a specific unit fault, contact the manufacturer at (865) 988-9800 for
special instructions.
7
Removal and replacement infor-
mation
Removal: The CTL45T is attached to the aircraft using ¼-turn Dzus fasteners.
To release, insert a slotted screwdriver into the head and turn counterclockwise.
Release the wiring connectors by sliding the latches from the retaining standoff.
The HUB45R is attached to the aircraft using four #6 screws on the flanges.
Installation: Reverse the connector installation process. Place the unit against
the Dzus rail and with the slotted screwdriver push gently and turn ¼-turn to se-
cure.
8
Diagrams
Not applicable
9
Special Inspection Requirements
Not Applicable
10
Protective Treatments
Not Applicable
11
Structural Data
Not Applicable
12
Special Tools
None
13
Not Applicable
Not Applicable
14
Recommended Overhaul Periods
None
15
Airworthiness Limitations
Not Applicable
16
Revision
To be determined by installer
