Maximize performance and reliability of your aircraft’s loudspeaker system.
AEM’s AA21-400 Cabin PA and Siren Controller is a single, panel-mounted unit that provides a simple interface to all generations of AEM’s loudspeaker amplifiers and speakers. It maximizes the performance and reliability of your aircraft’s PA system with state-of-the-art design, improved frequency response, and an optimized microphone input circuit.
Integrators will appreciate the AA21-400’s simple interface with existing aircraft audio systems. We also made the unit configurable to receive either radio or CD audio, allowing for radio rebroadcast capability or playback of recorded information.
Compliance
- D0-160D
- DO-170
- TSO-C50c
- Optimized microphone audio input circuit
- Field-adjustable audio inputs
- Selectable wail and yelp siren
- 25-watt internal speaker amp
- Available in standard configurations or customized panel layouts, with 5 Vdc or 28 Vdc standard white lighting
- Optional NVIS lighting
AA21-400 Documents
| ID | Title | Content | Image | Date | Categories | Link |
|---|---|---|---|---|---|---|
| 8645 | AA21-401 Installation and Operation Manual Supplement |  | 2025/05/16 | Loudspeaker Controller Supplement | Download | |
| 8647 | AA21-403 Installation and Operation Manual Supplement |  | 2025/05/16 | Loudspeaker Controller Supplement | Download | |
| 8267 | AA21-405 Installation and Operation Manual Supplement |  | 2025/05/06 | Loudspeaker Controller Supplement | Download | |
| 8505 | AA21-406 Installation and Operation Manual Supplement |  | 2025/05/15 | Loudspeaker Controller Supplement | Download | |
| 8511 | AA21-407 Installation and Operation Manual Supplement |  | 2025/05/15 | Loudspeaker Controller Supplement | Download | |
| 8512 | AA21-408 Installation and Operation Manual Supplement |  | 2025/05/15 | Loudspeaker Controller Supplement | Download | |
| 8513 | AA21-450 Installation and Operation Manual Supplement |  | 2025/05/15 | Loudspeaker Controller Supplement | Download | |
| 8514 | AA21-4xx Installation and Operation Manual |  | 2025/05/15 | Loudspeaker Controller Supplement | Download | |
| 8515 | AA22 Installation and Operation Manual |  | 2025/05/15 | Loudspeaker Controllers | Download | |
| 8516 | AEM Notice Of Ownership Change |  | 2025/05/15 | Avionics Consoles | Download | |
| 13666 | AEM Self Evaluation |  | 2025/05/28 | Certifications | Download | |
| 8517 | AWG08 Installation and Operation Manual |  | 2025/05/15 | Audio Warning Generators | Download | |
| 8518 | BAA01 Installation and Operation Manual |  | 2025/05/15 | Specialty Audio | Download | |
| 13671 | Controlled Goods Certificate of Registration |  | 2025/05/28 | Certifications | Download | |
| 8519 | EMI Test Procedure (GA1-2TP) |  | 2025/05/15 | Digital Audio Systems | Download | |
| 8878 | EMI Test Procedure (GA1-2TP) |  | 2025/05/23 | Accessories | Download | |
| 8520 | G13000R Installation and Operation Manual Supplement |  | 2025/05/15 | Digital Audio Systems | Download | |
| 8521 | G13116R Installation and Operation Manual Supplement |  | 2025/05/15 | Digital Audio Systems | Download | |
| 8522 | G13116RNS Installation and Operation Manual Supplement |  | 2025/05/15 | Digital Audio Systems | Download | |
| 13669 | ISO 9001:2015 and AS9100D Certificate |  | 2025/05/28 | Certifications | Download | |
| 13674 | JCAB Maintenance Approval Certificate |  | 2025/05/28 | Certifications | Download | |
| 13675 | JOSCAR Registered Supplier |  | 2025/05/28 | Certifications | Download | |
| 8523 | LS Installation and Operation Manual |  | 2025/05/15 | Loudspeakers | Download | |
| 8524 | LS Service Bulletin – Bell Stop Drill Procedure |  | 2025/05/15 | Loudspeakers | Download | |
| 8526 | LS Service Bulletin – Re-entrant tip securing (MOD 2) |  | 2025/05/15 | Loudspeakers | Download | |
| 8527 | LS Service Bulletin – Re-entrant tip securing (MOD 4) |  | 2025/05/15 | Loudspeakers | Download | |
| 8528 | LS Service Bulletin – Re-entrant tip securing inspection (Loctite® LRUs only) |  | 2025/05/15 | Loudspeakers | Download | |
| 8529 | LS Service Bulletin – Re-entrant tip securing inspection (Loctite® LRUs, MOD 3) |  | 2025/05/15 | Loudspeakers | Download | |
| 8530 | LS150 Installation and Operation Manual |  | 2025/05/15 | Loudspeakers | Download | |
| 8531 | LS300 Installation and Operation Manual |  | 2025/05/15 | Loudspeakers | Download | |
| 8533 | LS600 Installation and Operation Manual |  | 2025/05/15 | Loudspeakers | Download | |
| 8534 | LS800 Installation and Operation Manual |  | 2025/05/15 | Loudspeakers | Download | |
| 8535 | LSA100 Installation and Operation Manual |  | 2025/05/15 | Cabin PA Amplifiers | Download | |
| 8536 | LSA150-001 Installation and Operation Manual Supplement |  | 2025/05/15 | Loudspeaker Amplifier Supplement | Download | |
| 8537 | LSA300-001 Installation and Operation Manual Supplement |  | 2025/05/15 | Loudspeaker Amplifier Supplement | Download | |
| 8539 | LSA400 Installation and Operation Manual |  | 2025/05/15 | Loudspeaker Amplifier Supplement | Download | |
| 8541 | LSA800 Installation and Operation Manual |  | 2025/05/15 | Loudspeaker Amplifier Supplement | Download | |
| 8543 | LSA800-002 Installation and Operation Manual Supplement |  | 2025/05/15 | Loudspeaker Amplifier Supplement | Download | |
| 8544 | LSC-APS Software Installation and Operation Procedure |  | 2025/05/15 | Loudspeaker Controllers | Download | |
| 8546 | LSC22 Installation and Operation Manual |  | 2025/05/15 | Loudspeaker Controllers | Download | |
| 8549 | LSC22-002N Installation and Operation Manual Supplement |  | 2025/05/15 | Loudspeaker Controller Supplement | Download | |
| 8551 | LSC22-003N Installation and Operation Manual Supplement |  | 2025/05/15 | Loudspeaker Controller Supplement | Download | |
| 8553 | LSC22-103N Installation and Operation Manual Supplement |  | 2025/05/15 | Loudspeaker Controller Supplement | Download | |
| 8554 | LSC22-105N Installation and Operation Manual Supplement |  | 2025/05/15 | Loudspeaker Controller Supplement | Download | |
| 8555 | MCP Application Installation and Operation Manual |  | 2025/05/15 | Master Caution Panels | Download | |
| 8557 | MCP01 Information Bulletin – Custom Legends |  | 2025/05/15 | Master Caution Panels | Download | |
| 8558 | MCP01 Installation and Operation Manual |  | 2025/05/15 | Master Caution Panels | Download | |
| 8560 | MCP01 Service Bulletin – GOV MANUAL Diodes & CPF Voltage Adj. (MOD 4) |  | 2025/05/15 | Master Caution Panels | Download | |
| 8561 | MCP01 Service Bulletin – State recorder firmware update (MOD 3) |  | 2025/05/15 | Master Caution Panels | Download | |
| 8562 | MCP01-120 Installation and Operation Manual Supplement |  | 2025/05/15 | Master Caution Panels | Download | |
| 8564 | MCP01-120N Installation and Operation Manual Supplement |  | 2025/05/15 | Master Caution Panels | Download | |
| 8565 | MCP01-130N Installation and Operation Manual |  | 2025/05/15 | Master Caution Panels | Download | |
| 8567 | MCP02 Installation and Operation Manual |  | 2025/05/15 | Master Caution Panels | Download | |
| 8569 | MCP03 Installation and Operation Manual |  | 2025/05/15 | Master Caution Panels | Download | |
| 8571 | MCP03 Installation and Operation Manual | | 2025/05/15 | Master Caution Panels | Download | |
| 8572 | MTP136D AS350 Flight Manual Supplement (AEM001-818-0100) |  | 2025/05/15 | Radios | Download | |
| 8573 | MTP136D AS350 ICA (AEM001-639-0100) |  | 2025/05/15 | Radios | Download | |
| 8574 | MTP136D AS350 Interconnect (AEM001-403-0100) |  | 2025/05/15 | Radios | Download | |
| 8575 | MTP136D AS350 Mechanical Installation (AEM001-952-0100) |  | 2025/05/15 | Radios | Download | |
| 8576 | MTP136D AS350 Modification Order (AEM001-658-0100) |  | 2025/05/15 | Radios | Download | |
| 8577 | MTP136D Service Bulletin – Optional: FW 1.02 Installation |  | 2025/05/15 | Radios | Download | |
| 8844 | MTP136D Service Bulletin – Optional: Hot Temperature Startup Fault MOD 2 |  | 2025/05/23 | Radios | Download | |
| 8847 | MTP136D-000GN Installation Approval Test Procedure |  | 2025/05/23 | Radios | Download | |
| 8850 | MTP136D-000GN Installation Manual |  | 2025/05/23 | Radios | Download | |
| 8874 | MTP136D-000GN Operators Guide FW 1.01 |  | 2025/05/23 | Radios | Download | |
| 8578 | MTP136D-000GN Operators Guide FW 1.02 |  | 2025/05/15 | Radios | Download | |
| 8579 | MTR138-000GNW Installation and Operation Manual |  | 2025/05/15 | Radios | Download | |
| 8580 | MTR138-000GNW Service Bulletin – Optional MOD 1 Rev 1.20 Firmware |  | 2025/05/15 | Radios | Download | |
| 8583 | P122 & P132 ICA (ICA107-2) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8584 | P122 & P132 Installation Manual (GA107-1) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8585 | P122 & P132 RFMS, Post-Mod 350A07-074280 (GA107-13) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8586 | P122 & P132 Wiring Diagrams (G12132) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8587 | P122 Installation Manual, Post-Mod 350A07-074280 (G13122) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8588 | P122 Installation Manual, Pre-Mod 350A07-074280 (G12311) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8589 | P122 RFMS, Pre-Mod 350A07-074280 (GA107-2) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8590 | P122 Service Bulletin – Optional: Linear Grommet Inspection & Retrofit |  | 2025/05/16 | Avionics Consoles | Download | |
| 8591 | P132 Cover Installation (G13138) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8592 | P132 Information Letter – Cyclic Stick (107-19-002) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8593 | P132 Installation Manual, Post-Mod 350A07-074280 (G13132) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8594 | P132 Installation Manual, Pre-Mod 350A07-074280 (GA107-6) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8595 | P132 RFMS, Pre-Mod 350A07-074280 (GA107-2-P132) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8596 | P132 Service Bulletin – Cyclic Stick (GA107-7) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8597 | P139-HD ICA (ICA182-2) |  | 2025/05/16 | Avionics Consoles | Download | |
| 8598 | P139-HD ICA (ICA182-3) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8599 | P139-HD ICA (ICA182-5) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8602 | P139-HD ICA (ICA212-1) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8603 | P139-HD ICA (ICA212-3) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8604 | P139-HD Installation Manual (GA182-11) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8605 | P139-HD Installation Manual (GA182-7) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8606 | P139-HD Installation Manual (GA182-8) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8607 | P139-HD Installation Manual (GA212-3) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8608 | P139-HD Installation Manual (GA212-4) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8609 | P139-HD Operators Guide (Formerly GA063-3) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8610 | P139-HD RFMS – Japanese (412EP) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8611 | P139-HD RFMS (GA182-12) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8612 | P139-HD RFMS (GA182-3) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8613 | P139-HD RFMS (GA182-6) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8840 | P139-HD RFMS (GA212-1) |  | 2025/05/23 | Digital Audio Systems | Download | |
| 8614 | P139-HD RFMS (GA212-2) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8615 | P139-HD Troubleshooting Guide (GA212-01) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8616 | P139-HD Wiring Diagram, 1 & 2 Board Routers (G13004) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8617 | P139-HD Wiring Diagram, 3 Board Router (G13162) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8618 | P174 ICA (ICA203-1) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8619 | P174 ICA (ICA203-2) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8620 | P174 ICA (ICA203-3) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8621 | P174 ICA (ICA203-4) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8622 | P174 ICA (ICA204-1) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8880 | P174 ICA (ICA204-1) |  | 2025/05/23 | Accessories | Download | |
| 8623 | P174 ICA (ICA204-2) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8877 | P174 Installation Manual (GA203-1) | 2025/05/23 | Accessories | |||
| 8624 | P174 Installation Manual (GA203-1) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8625 | P176 ICA (ICA107-5) |  | 2025/05/16 | Digital Audio Systems | Download | |
| 8626 | P176 Installation Instructions (GA107-12) |  | 2025/05/16 | Accessories | Download | |
| 8627 | P178 EMI Test Procedure (7001-TP-001) |  | 2025/05/16 | Failsafe Audio Mixer | Download | |
| 8628 | P178 EMI Test Procedure (7002-TP-001) |  | 2025/05/16 | Failsafe Audio Mixer | Download | |
| 8629 | P178 ICA (7001-IC-001) |  | 2025/05/16 | Failsafe Audio Mixer | Download | |
| 8630 | P178 ICA (7001-IC-002) |  | 2025/05/16 | Failsafe Audio Mixer | Download | |
| 8631 | P178 ICA (7001-IC-003) |  | 2025/05/16 | Failsafe Audio Mixer | Download | |
| 8632 | P178 ICA (7002-IC-001) |  | 2025/05/16 | Failsafe Audio Mixer | Download | |
| 8633 | P178 ICA (7002-IC-002) |  | 2025/05/16 | Failsafe Audio Mixer | Download | |
| 8634 | P178 Installation Instructions (G13121) |  | 2025/05/16 | Failsafe Audio Mixer | Download | |
| 8635 | P178 Modification Instructions (7001-MI-001) |  | 2025/05/16 | Failsafe Audio Mixer | Download | |
| 8636 | P178 Modification Instructions (7002-MI-001) |  | 2025/05/16 | Failsafe Audio Mixer | Download | |
| 8637 | RTS01 Installation and Operation Manual |  | 2025/05/16 | Remote Transmit Selectors | Download | |
| 13673 | Transport Canada Maintenance Approval Certificate (AMO 91-09) |  | 2025/05/28 | Certifications | Download | |
| 13672 | Transport Canada Manufacturing Approval Certificate (AO 91-09) | | 2025/05/28 | Certifications | Download | |
| 8638 | TS100/TS200 Installation and Operation Manual |  | 2025/05/16 | Loudspeakers | Download | |
| 8640 | TS150/TS300 Installation and Operation Manual |  | 2025/05/16 | Loudspeakers | Download | |
| 8641 | TS92/TS93/TS94 Installation and Operation Manual |  | 2025/05/16 | Loudspeakers | Download | |
| 8643 | VR33 Installation and Operation Manual |  | 2025/05/16 | DC Power Converters | Download |
| AA21 Mechanical Specs | |
|---|---|
| Height | 1.11″ [28.1 mm] MAX |
| Depth (behind panel) | 6.33” [160.8 mm] MAX |
| Depth (behind panel with connectors) | 6.53” [165.9 mm] MAX |
| Width (behind panel) | 4.96″ [126.0 mm] MAX |
| Width (front panel) | 5.75″ [146.1 mm] MAX |
| Weight | 1.4 lb [0.64 kg] MAX |