Part #:

Model: CAD-31

Collins Aerospace - Control Adapter
Part Number :

  • Control adapter used to adapt Pro Line II CTL-22 and CTL-32 Controls for use with the Pro Line VHF-20, VHF-20A, VHF-20B \n and VIR-30A, VIR-31A, VIR-31H remote avionics units
  • Adapts serial tuning data output from Proline II DME-42 DME Transceiver to parallel data used by other equipment
  • Converts serial data from Proline II CTL-22/32 or RTU-42XX (-002 only) to 2-out-of-5 parallel data used by Proline I radios
  • Used to adapt data from Collins RTU-42XX (Radio Tuning Units) to Proline units (-002 only)
  • -001 unit can select NAV-DME or VHF COMM mode and differentiate between source 1 or 2
  • -002 unit can select NAV-DME, VHF COMM, and DME modes of operation
  • Will select appropriate serial command based on priority logic which favors NAV commands
  • DME Mode permits the -002 to condition output based on DME frequency command regardless of presence of NAV freq command
TSO: C36d, c40b, C34d, C35d, C37c, C38c, C66b RTCA: DO-160A, DO-131A, DO-153A, DO-132A, DO-143, DO-156, DO-157, DO-151A
EUROCAE: ED-46, ED-22A, ED-47, 1/WG 7/70, ED-23, ED-24, MPS/WG 8/1/71 Environmental: DO-160A, categories /A2E1/B/JY/ EXXXXXZ/BZ/AZA/ EUROCAE ED-14A
Weight: 0.7 lb. Dimensions: 3.35"H x 1.04"W x 5.00"L
Temperature: -55 to 70C (operation) Altitude: 70000 ft.
Power Requirement: +27.5 VDC, 0.2A max Cooling: Convection
Part NumberControl Adapter Description:
622-8332-001 Original version, see details above
622-8332-002 Current production version, see details above


- Control Adapter

NSN: 6625-01-329-0815

Price Condition Delivery

SEA Repair Capabilities: Yes

- Nav Adapter

NSN: 6625-01-546-0880

Price Condition Delivery

SEA Repair Capabilities: Yes

Click on a question below to see the answer. If you have a question about this model that is not answered below, please contact

Southeast Aerospace exchanges are based on the return of an undamaged, economically repairable core unit with identical part number as the unit shipped to the customer. An "economically repairable" core is defined as one where the cost to repair/overhaul (or Repair Cap) does not exceed 80% of the original SV/OH exchange price billed. Should the Repair Cap exceed 80%, the customer will be billed the additional amount. In the event this amount exceeds the Outright Price for the unit, the customer would only be billed the difference between the Outright Price and SV/OH Exchange Price with the core returned as-is to the customer.

Here is an example of such a transaction:

$1000 Exchange Price charged to customer
$1000 x .8 = $800 Maximum Allowable core repair charge or Repair Cap

$2000 Cost to repair core unit
- $800 Less Core repair cap
$1200 Additional billing amount.

2200.00 Total Cost of transaction

Please Note:
SEA offers exchange on new items as well. However, repair cap as indicated above is still based on SV/OH exchange price.

The CTL-X0 is 30-40 years old. Service parts from Collins are either no longer available or extremely expensive. It is not cost effective nor possible in some situations to continue to utilize the CTL-X0 controls in your aircraft. Southeast Aerospace recommends converting the CTL-X0 controls over to the Collins CTL-X2 Proline II controls.

The CTL-X2 is not a direct replacement for the CTL-X0 controls. A connector change, CAD adapter, and locally fabricated panel filler plate are required for the change. A qualified avionics technician should perform this modification. While this is a moderately involved retrofit, it is a change that is eminent and will ultimately be required if you continue to use your original Proline I radios.

  • To convert from the CTL-20 Comm control, the CTL-22, CAD-31, mating connectors, and CAD bracket are required.
  • To convert from the CTL-30 Nav control, the CTL-32, CAD-31, mating connectors, and CAD bracket are required.
  • To convert from the CTL-60 ADF control, the CTL-62, CAD-62, mating connectors, and CAD bracket are required.
  • To convert from the CTL-90 Transponder control, the CTL-92, CAD-62, mating connectors, and CAD bracket are required.

For an exact SEA quote to convert from your CTL-X0 control, please provide the part number of your CTL-X0. Contact SEA with this information and an SEA rep will provide a quotation immediately.