Audio Control Amplifier 438-003
Condition as listed — Condition disclosed — is shown up front on this listing, along with the exact price, current availability, and what certification paperwork ships with the part, so you can confirm fit and airworthiness before you buy. Full specifications and answers to common questions are below.
Request certification documents (8130-3 / EASA Form 1 / C of C)
Description
The Model 438 Audio Control Amplifier is a remotely controlled, electronic unit which operates upon command from switches and potentiometers in the cockpit. The amplifier is capable of switching and separately controlling the volume for up to 12 receiver inputs. It also switches five sidetone inputs and an interphone line.
Version 483-003 provides interphone operating levels for 8-station interphone system (37ohm interphone line) with more interphone audio to the speaker and headphone than the base model. Also increases the receiver levels to compensate for increased load on the receivers by multistation Model 438's.
- Two unswitched and unmuted inputs for aural warning input and an auxiliary input
- Headphone and selected speaker outputs are isolated
- Cockpit voice recorder output from headphone and interphone microphone audio
- Microphone audio can be recorded on the cockpit voice recorder at all times
- Pilot select COMM output produces a summation of COMM1 through COMM 4, DME 1 and 2, and the MKR 1 and 2 receiver inputs
- Compatible with the model 240, 250, or 251 PSC audio input channel (or equivalent)
- Speaker channel is powered through an internal fuse separate from the headphone channel
- Receiver and operating modes are electronically switched
- Electronic attenuator in each of the 12 receiver input channels
- 30 dB attenuator range control cockpit volume potentiometer
- Selective voice or code filtering on four receiver audio inputs
- Voice activated switch in series with microphone input
Product Codes | |
|---|---|
| Mfr Part No: | 438-003 |
| PMA: | PQ2204NM |
| PROAPP: | TSO: PT2204NM / PMA: PQ2204NM |
| TSO: | C50c |
Operating mode pin numbers: P40-18 Speaker switch P40-6 INPH hot switch P40-14 INPH to speaker switch P40-16 PTT switch P40-11 Voice switch P50-6,7,9,10,11,12,13,23,24,27,28,29 Receiver switches P50-22 PA key  Test.
Specifications
| Part number | 438-003 |
|---|---|
| Manufacturer | — |
| Condition | — |
| Airworthiness | Condition disclosed |
| Country of origin | — |
| Lead time | days |
Frequently asked
Does the Audio Control Amplifier 438-003 include certification paperwork?
This item is supplied as "Condition disclosed" rather than with full 8130-3 traceability — normal for some condition codes, and it does not mean the part is unusable, only that the paperwork profile differs. Check the listing for exactly what documentation is included, and request any available records before you purchase if your installation requires them.
What condition is this part?
This part is listed in condition as listed — Condition disclosed. Condition codes describe how a part reached its current state (for example new, overhauled, serviceable, repaired, or as-removed) and directly affect what paperwork ships with it and how it should be installed. See the Glossary for the full definition of every condition code we use.
How fast does it ship?
This item is currently on backorder, meaning demand has temporarily outpaced our stock and a new shipment is inbound from the manufacturer or our supplier. Request a quote and we will confirm the current estimated delivery window before you commit. If your aircraft is grounded, AOG expedited handling is available on request.
Can I return it?
You may return this item within 30 days of delivery if it is unopened, uninstalled, and in its original packaging. Items that have been installed, powered on, opened hazmat, or separated from an attached 8130-3 tag are non-returnable because their airworthiness status can no longer be confirmed once removed from the part. See our Returns policy for the full process.
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