Owner Produced Part

Owner-Produced Part (OPP) Logbook Sign-Offs

Under 14 CFR 21.9(a)(5) (formerly 21.303(b)(2)), an aircraft owner is legally permitted to produce a part to maintain their own certified aircraft.

Because the Tamco Avionics kit does not carry a factory Parts Manufacturer Approval (PMA), using the Owner-Produced Part pathway provides an airtight legal framework for your mechanic. Under this rule, you (the owner) take responsibility for the manufacture and quality control of the part, and the mechanic takes responsibility for verifying its layout and safe installation. [1, 2]

Sign-Off Examples Only (may contain errors):

Option A: Wording if your local A&P installs the DIY Kit

[DATE] – [TOTAL TIME / TACH / HOBBS]
Removed BendixKing KX-155 Nav/Comm transceiver, P/N: [INSERT PART NUMBER], S/N: [INSERT SERIAL NUMBER], from panel. Disassembled unit on bench. Removed defective OEM gas-discharge display tube. Installed aftermarket Tamco Avionics upgraded OLED display assembly and custom clear filtering lens in accordance with manufacturer instructions. Reassembled unit and reinstalled into aircraft mounting tray. Performed ground operational check of Comm transceiver clarity, Nav receiver audio, and display presentation. Verified display automatic-dimming and manual-override configurations function normally via the power-on microphone key initialization routine. All other systems function normally. Approved for return to service strictly for the work performed.

[Mechanic Signature]
A&P [Certificate Number]

Option B: Wording if you use Tamco’s Mail-In “Overhaul Service”

[DATE] – [TOTAL TIME / TACH / HOBBS]
Removed BendixKing KX-155 Nav/Comm transceiver, P/N: [INSERT PART NUMBER], S/N: [INSERT SERIAL NUMBER], from aircraft tray and forwarded to Tamco Avionics for bench display upgrade service. Reinstalled unit following factory display overhaul and clear faceplate lens modification. Performed ramp operational test of Comm frequency select, Nav receiver signal tracking, and localizer/glideslope indication. Verified power-on initialization menu functional, including “Auto-Dimmer Enabled” toggle via microphone key select and manual dim settings. Instrument tracks and transmits within acceptable limits. Aircraft is approved for return to service regarding this maintenance.

[Mechanic Signature]
A&P [Certificate Number]

COCKPIT QUICK REFERENCE: BENDIX-KING KX-155 OLED DISPLAY DIMMING

Option 1: To Enable Automatic Dimming (LDR Mode)
PRESS and HOLD the microphone PTT switch.
TURN ON the KX-155 radio power switch.
RELEASE the PTT switch within the first second when the display shows: “Auto-Dimmer Enabled”.

Option 2: To Set Manual Dimming Level
PRESS and HOLD the microphone PTT switch.
TURN ON the KX-155 radio power switch.
CONTINUE HOLDING the PTT switch past the first second.
CYCLE / RELEASE the PTT switch when your desired dimming levels (1 through 4) cycle onto the screen.

Option 3: Default Max Brightness (Day Mode)
TURN ON the radio normally without touching the microphone PTT switch. The display will automatically exit to maximum daytime brightness.

Pro-Tip for the FAA Ramp File
Keep a copy of your original invoice or receipt from Tamco Avionics stapled to your maintenance records alongside these logbook entries. This establishes the exact origin and quality control history of the components if an inspector ever asks for documentation regarding the Owner-Produced Part.

Here is a formal Statement of Conformance letter:

As the aircraft owner, you should fill in the bracketed information, sign it, and keep a copy in your aircraft records file alongside your logbook entry. Providing this document gives your A&P/IA mechanic perfect regulatory coverage to approve the repair under the FAA’s “Owner-Produced Part” guidance.

STATEMENT OF CONFORMANCE:

FAA OWNER-PRODUCED PART DECLARATION
(Pursuant to 14 CFR § 21.9(a)(5) and FAA Advisory Circular AC 21-45)

Date: July 20, 2026

AIRCRAFT & APPLIANCE INFORMATION:

Aircraft Make/Model: [e.g., Cessna 172N / Piper PA-28]Aircraft Registration (Tail #): [e.g., N12345]

Aircraft Serial Number: [e.g., 17268421]
Appliance Type: Nav/Comm Transceiver
Appliance Manufacturer: BendixKing / Honeywell
Appliance Model: KX-155
Appliance Part Number (P/N): [Insert radio P/N from data tag]
Appliance Serial Number (S/N): [Insert radio S/N from data tag]

DECLARATION OF PRODUCTION & QUALITY CONTROL:
I, the undersigned aircraft owner, hereby declare that I have produced and/or participated in the design oversight and quality control of a replacement display module for the aforementioned Bendix-King KX-155 Nav/Comm transceiver.

This part has been produced strictly for installation on my own certified aircraft under the provisions of 14 CFR § 21.9(a)(5) (formerly 21.303(b)(2)), which allows aircraft owners to manufacture parts for the maintenance of their own aircraft.

CONFORMANCE & QUALITY ASSURANCE CRITERIA:
Engineering Support: Production was completed using advanced component layouts, printed circuit board (PCB) designs, and engineering schematics specialized for this application by Tamco Avionics.

Form, Fit, and Function: The physical layout of the replacement display utilizes reverse-mounted surface-mount devices (SMDs) to ensure absolute physical clearance with the original Bendix-King internal plastic chassis relief holes. No modification or cutting of the original original equipment manufacturer (OEM) chassis structure was required.

Materials & Display Integration: The assembly replaces the obsolete, degraded OEM plasma-gas discharge tube with a modern Organic Light Emitting Diode (OLED) panel. A custom clear faceplate filtering lens was utilized to maintain optimal day/night contrast, visual character clarity, and over 0.2-inch character alignment.

Electrical & Dimming Interface: The display module integrates completely with the original wiring footprint. It retains an auto-dimming function and a user-selectable manual override system initialized via standard microphone push-to-talk (PTT) sequencing upon power-up. No structural, electrical load, or weight-and-balance changes were introduced.

OWNER SIGNATURE & ACKNOWLEDGEMENT:
By signing below, I certify that I have exercised direct quality control over the sourcing, fabrication, or bench assembly of this component. I acknowledge that this part conforms to acceptable aviation maintenance practices and is structurally and operationally safe for installation in the identified appliance.

Aircraft Owner Name (Print): ______________________________
Aircraft Owner Signature: ______________________________
MECHANIC / INSPECTOR VERIFICATION:

(To be completed by the installing A&P Mechanic or Part 145 Bench Technician)

I have inspected the owner-produced display module described above. I have verified its physical dimensions, material finish, circuit safety, and functional conformance against the original Honeywell/Bendix-King tray specifications. The installation has been completed as a Minor Repair, and a corresponding maintenance record entry has been logged.

Installing Technician Name / Rating: ______________________________

Certificate Number: ______________________________

Signature: ______________________________

==================================================================

Example 2:

STATEMENT OF CONFORMANCE
FAA OWNER-PRODUCED PART DECLARATION
(Pursuant to 14 CFR § 21.9(a)(5) and FAA Advisory Circular AC 21-45)

Date: July 20, 2026
Aircraft & Appliance Information
Aircraft Make/Model:___________________

1. DECLARATION OF PRODUCTION & QUALITY CONTROL

I, the undersigned aircraft owner, hereby declare that I have produced and/or participated in the design oversight and quality control of a replacement display module for the aforementioned BendixKing KX-155 Nav/Comm transceiver.

This part has been produced strictly for installation on my own certified aircraft under the provisions of 14 CFR § 21.9(a)(5) (formerly 21.303(b)(2)), which allows aircraft owners to manufacture or commission parts for the maintenance of their own aircraft.

2. CONFORMANCE & QUALITY ASSURANCE CRITERIA

Engineering Support: Production was completed using advanced component layouts, printed circuit board (PCB) designs, and engineering schematics specialized for this application by Tamco Avionics.

Form, Fit, and Function: The physical layout of the replacement display utilizes reverse-mounted surface-mount devices (SMDs) to ensure absolute physical clearance with the original Bendix-King internal plastic chassis relief holes. No modification or cutting of the original equipment manufacturer (OEM) chassis structure was required.

Materials & Display Integration: The assembly replaces the obsolete, degraded OEM plasma-gas discharge tube with a modern Organic Light Emitting Diode (OLED) panel. A custom clear faceplate filtering lens was utilized to maintain optimal day/night contrast, visual character clarity, and over 0.2-inch character alignment.

Electrical & Dimming Interface: The display module integrates completely with the original wiring footprint. It retains an auto-dimming function and a user-selectable manual override system initialized via standard microphone push-to-talk (PTT) sequencing upon power-up. No structural, electrical load, or weight-and-balance changes were introduced.

3. OWNER SIGNATURE & ACKNOWLEDGEMENT

By signing below, I certify that I have exercised direct quality control over the sourcing, fabrication, or bench assembly of this component. I acknowledge that this part conforms to acceptable aviation maintenance practices and is structurally and operationally safe for installation in the identified appliance.

Aircraft Owner Name (Print): ______________________________

Aircraft Owner Signature: ______________________________

Date: ________________________

4. MECHANIC / INSPECTOR VERIFICATION

(To be completed by the installing A&P Mechanic or Part 145 Bench Technician)

I have inspected the owner-produced display module described above. I have verified its physical dimensions, material finish, circuit safety, and functional conformance against the original Honeywell/Bendix-King tray specifications. The installation has been completed as a Minor Repair, and a corresponding maintenance record entry has been logged.

Installing Technician Name: ______________________________

Certificate Number / Rating: ______________________________

Signature: ______________________________

Date: ________________________

COCKPIT QUICK REFERENCE: BENDIXKING KX-155 OLED DIMMING

Option 1: To Enable Automatic Dimming (LDR Mode)
PRESS and HOLD the microphone PTT switch.
TURN ON the KX-155 radio power switch.
RELEASE the PTT switch within the first second when the display shows: “Auto-Dimmer Enabled”.

Option 2: To Set Manual Dimming Level
PRESS and HOLD the microphone PTT switch.
TURN ON the KX-155 radio power switch.
CONTINUE HOLDING the PTT switch past the first second.
CYCLE / RELEASE the PTT switch when your desired dimming levels (1 through 4) cycle onto the screen.

Option 3: Default Max Brightness (Day Mode)
TURN ON the radio normally without touching the microphone PTT switch. The display will automatically exit to maximum daytime brightness.