822-1121-004

Collins CTL 23C NAV/COMM control 822-1121-004

822-1121-004 is the exact Part Number for this Collins CTL 23C navigation and communication control unit. The cockpit-mounted panel provides frequency and operating controls for compatible NAV/COMM equipment. Its upper display area presents communication and navigation frequency information, while the lower controls manage operating state, squelch and frequency entry. The unit gives the crew an accessible control interface without duplicating the radio-frequency electronics installed elsewhere in the aircraft.

The CTL 23C is not a complete radio transceiver. It sends crew selections to associated communication and navigation equipment and displays the status returned by that installation. A typical functional path is crew frequency input at the CTL 23C, control transfer through the approved wiring, processing by the connected radio equipment, and transmission, reception or navigation output through the applicable antennas and cockpit audio or indication system.

Communication and navigation frequency control

The front panel separates COM and NAV selection and provides a main tuning control for entering frequencies. The operating selector includes standby, off, on and squelch positions. Display annunciations support frequency management and status monitoring in the configured installation. The exact behavior of memory, remote-transfer, hold and monitoring functions depends on the connected avionics and aircraft wiring, so panel labels should not be treated as proof that every function is active on every aircraft.

Published Collins field-support documentation identifies 822-1121-004 as a CTL 23C COM/NAV control with black-and-white 28-volt lighting and 8.33 kHz capability. That exact suffix information matters because other CTL 23C variants can use different lighting voltages, display colors or control configurations. A unit with a similar faceplate but another suffix must not be ordered as an automatic replacement without an approved comparison.

Identification plate and qualification references

The authentic rear photograph clearly shows TYPE NO. CTL-23C and PN 822-1121-004. The plate also states a weight of 1.2 pounds and lists FAA TSO references C34e, C36e, C37c, C38c, C40c and C66b. Environmental and software references include DO-160B and DO-178A Level 2 markings on the exact unit. These original markings should be matched to release documentation during receiving inspection.

The rear of the control includes a large multi-pin connector that carries power, lighting and system-control circuits. Connector condition is important because bent, recessed or contaminated contacts can produce intermittent frequency selection or display faults. Exact pin assignments and permissible electrical loads must come from the applicable Collins installation manual; they should not be inferred from connector shape or transferred from a nearby CTL family model.

Installation, testing and related equipment

In service, the CTL 23C works with compatible communication and navigation receiver-transmitter equipment, aircraft antennas, audio equipment and navigation indicators. Those components are functionally related but not included with this control unless specifically stated in the quotation. System composition varies by aircraft, and an operator should confirm the applicable radio pair, wiring standard, lighting supply and equipment approval before ordering.

Bench testing should verify power-up, display segments, COM and NAV selection, frequency entry, transfer or memory functions available in the configuration, squelch control, lighting and communication with approved test equipment. Installation inspection should confirm mounting, connector engagement, rack clearance and panel-lighting compatibility. A serviceable control head cannot correct faults in the remote radio, antenna, audio panel or aircraft wiring.

Serviceable supply and ordering information

This 822-1121-004 CTL 23C is offered in Serviceable condition from partner stock with a six-month warranty. The main photograph preserves the authentic front panel and unpowered display, while the gallery photograph shows the exact Part Number, serial number, qualification markings and connector. A visible serial number identifies the photographed reference unit and should be confirmed if serial-specific supply is required.

For an inquiry, specify Part Number 822-1121-004, model CTL 23C, aircraft type, associated NAV/COMM equipment, 28-volt lighting requirement, 8.33 kHz configuration, documentation and quantity. Related radio and navigation controls can be reviewed in the Garmin / BendixKing / Honeywell / Collins category. Related equipment may share one installation but is not automatically interchangeable.

Product Type: Navigation and communication control unit

Manufacturer: Collins Aerospace / Rockwell Collins

Model: CTL 23C

Designation: 822-1121-004

Alternative Designations: CTL23C; CTL-23C; 8221121004; Collins CTL 23C

Main Function: Cockpit frequency and operating control for compatible NAV/COMM equipment

Control Sections: COM and NAV

Operating Selector: Standby, Off, On and Squelch positions

Exact -004 Lighting: 28 V black-and-white lighting

Channel Spacing Capability: 8.33 kHz according to Collins field-support documentation

Display: Dual communication and navigation frequency display

Typical Signal Chain: CTL 23C crew input → compatible NAV/COMM equipment → antennas / audio / navigation indication

Rear Interface: Large multi-pin aircraft-system connector

Weight According to Plate: 1.2 lb / approximately 0.54 kg

FAA TSO References: C34e, C36e, C37c, C38c, C40c and C66b

Environmental Reference: DO-160B

Software Reference: DO-178A Level 2 marking on the exact unit

Exact Dimensions: Refer to the applicable CTL 23C installation drawing

Associated Equipment: Compatible communication and navigation radios, antennas, audio and indication equipment

Aircraft Applicability: Confirm from the aircraft equipment list and approved radio installation data

Interchangeability: Verify suffix, lighting, display configuration, channel spacing and connector compatibility

Condition: Serviceable

Warranty: 6 Months

Technical Documentation: Applicable Collins CTL 23C installation and component maintenance data

All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.

In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.

Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.

Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.

Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.