- TMW ENTERPRISES -

TMW Enterprises is an FAA Certified Repair Station that engineers, designs, and manufacturers specialized electronic and avionics test equipment for repair stations to expand or develop new repair capabilities. Test equipment for the Line Replaceable Unit (LRU) to removed printed circuit boards and subassemblies have been designed and manufactured for systems from engines to autopilots to radars. The testing, troubleshooting, and repairing today’s avionics equipment is becoming more complex. In addition, some repair stations are now receiving circuit cards and sub-assemblies removed from LRUs for repair. Failed circuit cards and sub-assemblies found during an Automated Test require a separate test set/stand for their troubleshooting and repair.

Since this test equipment has some or many printed circuit boards, designing them is beyond the capability of many repair stations. The design and layout of the printed circuit boards are done in house. Factory trained and certified in OrCAD Capture and PCB Editor software. The front panels are designed on a CAD/CAM program and manufactured on a CNC machine. Various panel configurations with color selections and text sizes/fonts are possible to satisfy customer’s desires.

After meeting and consultation with the repair station customer and determining their requirements. Research through the maintenance manual of unit going to be tested is done to determine the scope and degree of necessary testing requirements. I work with the company’s program manager on the project and advise him of my findings and recommendations before the design phase. The company’s input and eventual approval will ensure the equipment is built to their requirements. Panels are made to the customer’s desires and specific needs such as the size and positioning of items such as meters, switches, connectors, and placement of the company’s logo. Many projects involve interfacing a customer’s associated test equipment such as their ARINC 429 simulators into the test panel. I have extensive experience with programming ARINC 429 tests using software such as Co-Pilot by Ballard/Astronics, Mystic by Excalibur and Vortex by RTX Systems. Experienced with interface programming of GPIB controlled test equipment. After the test equipment is manufactured and tested, it is calibrated. Usually, a test LRU is provided by the customer for use in testing all the parameters and functions. The equipment is provided with the schematics and drawings. The test procedures to run the unit-under-test (UUT) are written and provided to the customer. Also, will provide assistance to repair stations and their DER (Designated Engineering Representative) when needed to develop their own FAA approved repair authorizations. Upon completion the equipment is delivered to the customer and its use demonstrated along with the training of their technicians. The Automated Test Equipment (ATE) gives a PASS or FAIL test result of the Line Replaceable Unit (LRU). In the case of a FAIL result, it directs the technician to replace a subassembly such as a circuit board or module. The repair of these subassemblies is accomplished outside the LRU and usually involves additional testing equipment to input the necessary voltages and signals. TMW Enterprises engineers, designs, and manufactures items such as circuit board/module testers and extender boards for troubleshooting printed circuit boards outside of the UUT. Other capabilities are the re-design or reverse-engineering of obsolete, burnt, damaged, or missing printed circuit boards. Printed circuit boards may not be available due to manufacturers termination of supporting products after several years, a company merger, or simply the manufacturer is no longer in business. This makes obtaining a replacement printed circuit board very difficult if not impossible. If the schematics and parts list are available the printed circuit board can be re-designed and manufactured to an identical form, fit, and function as the original.

Additional capability is the VSWR testing of radar altimeter and X-Band radar antennas using the HP8757D Network Analyzer and HP 83752A Synthesized Sweep Generator.

CERTIFICATIONS: 14CFR Part 145 FAA Certified Repair Station Number 5C3R300D OrCAD PCB Editor 17.2 Printed Circuit Board design OrCAD Capture 17.2 Printed Circuit Board design Recent projects:

• Design and manufacture of the AD33510-4 Synchrophaser Test Set for the 761230-1/-2, 766840, 774800 Synchrophaser units originally manufactured by Hamilton Standard.

• Honeywell BACKLIGHT CCA 4091889-1001 Tester.

• Thales TCAS Vertical Speed Indictor Test Set for 457400 Series Indicators.

• Honeywell TCAS Vertical Speed Indicator Test Set for the IVA-81A/81D Indicators.

• Developed repair capabilities for circuit cards in Honeywell MFD 8001671-902.

• Developed repair capabilities for Howell JetCal Analyzer BH112JD-80. Past projects:

• APQ-153/APQ-159 Fire Control Radar Antenna, Rcvr-Xmtr, Control Test Set 633175-303.

• APN-59 Radar System test panel.

• APN-171 Radar Altimeter system test panel.

• Collins 514M-2 Interface Panel to 972V-1 Test Set for the 374D-3 TACAN Rcvr-Xmtr.

• Radar Altimeter Test Set T322967 for testing the RT-220 and RT-300 Radar Altimeters.

• Avtech TR5171-1 Test Set for testing the Avtech 5171-1 audio panels used in the SAAB 340.

• Audio Panel TS502-0108 Test Set for testing the Telephonics 502-0011 audio panel in the SAAB 340.

• Sony Trans Com Cabin Entertainment systems tester 980-7072-001.

• Servo Tester for Bendix/King KS-270/270A and KS372 series autopilot servos.

• Cessna Standby Battery Test Box 7088020-1.

• 329B-8J/Y Flight Director Indicator Tester.

• Generator Control Unit 976J902-2 Tester.

• IVA-81A Output Dimmer Module 30090003-05XX Tester.

• IVA-81A Power Supply 30090002-05XX Tester.

TMW ENTERPRISES CAPABILITIES

TEST EQUIPMENT DESIGN AND MANUFACTURE

• SYNCHROPHASER TEST SET AD33510-4 equivalent

• For SYNCHROPHASER on C-130A-H and P-3 Orion Aircraft

• Part Numbers 761230-1/-2, 766840-1, 774800-1

This test set is based on the AD33510-4 test set originally manufactured by Hamilton Standard. This design has many improvements from the original AD33510-4 test set. It simulates the signals from the propellers, throttle position, engine rpm. Checks master engine operation from engine 2 or 3 and engines 1, 2, 3, or 4 as a slave engine. Checks underspeed and overspeed conditions. Fuel Governor, Speed, and Throttle tests are checked. Power Interrupt tests along with the NORM/GOV and SYNC tests are accomplished. Repairs and overhauls of the C-130/P-3 Synchrophasers can be accomplished by testing the four Power Amplifiers circuit cards, Master Sync circuit card, and Double Slave circuit card. The test set includes the Speed Bias Servo assembly housed on the bell housing of the T-56 engine. The Speed Bias Servo receives the output signals from either of the four power amplifier circuit boards and the motor moves in response to the outputs. The DC Voltmeter monitors the voltage outputs in accordance with rotary switch S3 selection. This test set has a total of thirteen printed circuit boards. The last photo shows the seven printed circuit boards that are accessible from the top of the test set. The unit is housed in a fiberglass case with easily transported handles and wheels. The power requirements are 115VAC 400HZ single phase.

Bench testing a 761230-1 Synchrophaser

Views of the Synchrophaser Test Set removed from the case and the printed circuit board access cover removed.

The Speed Bias Servo Assembly that is mounted inside the test set.

These are the seven printed circuit boards accessible from the front of the test set. They are the following:

• 0.1 HZ Generator Circuit Card (Brown Ejectors)

• Master Pulse Generator Card (Red Ejectors)

• Slave Pulse Generator Card (Orange Ejectors)

• Timer Logic Card (Yellow Ejectors)

• Phasemeter Card (Green Ejectors)

• 70 HZ VCO Card (Blue Ejectors)

• Power Interrupt Card (Violet Ejectors)

• THALES VERTICAL SPEED TCAS INDICATOR TEST SET This is one of many of these test sets designed and manufactured to operate the Thales Vertical Speed Indicators part number series 457400. This test set has ARINC 565 vertical speed outputs: 26Vac REF and phase selected Vertical Speed output to indicator, ARINC 575 DC vertical speed outputs: + / - 12vdc REF and polarity selected DC output, lighting output voltage, remote light sensor inputs, and ARINC 429 inputs/outputs. This photo shows the test set in operation with the indicator at zero feet/minute showing intruder targets in the ARINC 429 High Speed TCAS test. The explanation of the five intruders are as follows:

• One is at 1000 feet above, no vertical rate, at 3.625NM, at -33.75 degrees from aircraft and is other traffic, (cyan diamond outline).

• One is at 1000 feet below, vertical rate descending, at 3.625NM, at +33.75 degrees from aircraft, and is proximity traffic, (solid cyan diamond).

• One is at 200 feet above, no vertical rate, at 2.0NM, +90 degrees from aircraft, and is a RA - resolution advisory, (red square).

• One is at 200 feet below, vertical rate climbing, at 2.0NM, -90 degrees from aircraft, and is a TA - traffic advisory, (green circle).

• One is at 3200 feet below, no vertical rate, at 2.5NM, at 180 degrees from aircraft and is other traffic, (cyan diamond outline).

The ARINC 429 signals were generated by an Excalibur DAS429Unet device using the Mystic software programmed to operate on the four ARINC 429 channels.

The above printed circuit board was designed and used behind the front panel. By mounting all the toggle switches, tip jacks, and UUT valid lamps on this printed circuit board this eliminated all the wiring behind the panel and made for a cleaner and more compact project. Cutouts were made for the front panel mounted variable potentiometers, BNC jacks, lamps, and fuse holders. A PC mount DL3-60R ZIF connector was used saving considerable construction time since two of these test sets were manufactured for the customer.

HONEYWELL IVA-81A/81D VERTICAL SPEED TCAS INDICATOR TEST SET This test was designed and manufactured to test and repair the Honeywell IVA-81A Vertical Speed Indicator part number 066-50001-XXXX and IVA-81D Vertical Speed Indicator part number 066-01171-XXXX

Bench testing a Honeywell IVA-81A TCAS Vertical Speed Indicator in ARINC 565 mode showing 1000 fpm increasing and TCAS intruders from ARINC 429 Simulator.

• HONEYWELL BACKLIGHT CCA 4091889-1001 TESTER

This test set was engineered to activate the three separate LED Drivers on the Backlight Assembly 4091896-902. This unit is part of the 8-inch Honeywell Phase 3 Display unit part numbers 4091900-931 through -944. A common failure with this display is the backlight assembly. One or two LED strings fail rendering the display dim or unreadable. There are three LED lamp string circuits in the 4091889-1001 Driver assembly. This test set has three separate LED drivers on printed circuit boards housed in an electronic case. The digital panel meters monitor the voltage across each LED string and the current draw. The tester was engineered to operate the Backlight Assembly out of the display unit. It tests each LED lamp string separately and allows a technician to troubleshoot and repair the circuit card assembly removed from the 4091900- Display unit. One LED lamp string has 27 LEDs drawing a maximum of 1.4 Amperes, one LED lamp string with 26 LEDs drawing 1.4 amperes, and one LED lamp string with 109 LEDs drawing 70 milliamperes.

APQ-153 Fire Control Radar Antenna, Receiver-Transmitter, and Control This test set was built for an avionics repair/overhaul shop to repair and overhaul the antenna, receiver-transmitter, and control for the APQ-153 and APQ-159 Fire Control Radar on the F-5E aircraft. It is identical to the test set part number 633175-303 that was manufactured by Emerson Electric Corp. This test set complements the Indicator and Processor Test Set part number 633176-307 also manufactured by Emerson Electric Corp.

A1A4 Board

• Collins 329B-8J/Y Flight Director Indicator Test Set

This project was designed for a repair station to solve a high warranty problem. This test set exercises all the pointers, displays, and flags simultaneously similar to the actual aircraft operation. The Collins 980L-1 test set only tests each function individually. Several electronic circuits were designed to produce a slow and varying voltage that is adjustable in the upper and lower limit. One circuit to move the runway symbol in altitude, one to move it back and forth simulating the localizer deviation, another circuit drives the glideslope pointer up and down, another drives the speed command pointer up and down, another drives the rate-of-turn pointer, another drives the yellow command bar (V-Bar) in pitch, another circuit drives it in roll, and another drops the speed, glideslope, and rate-of-turn flags on and off at intervals of several seconds. A motor drive module was designed and built to move control transformers simulating the pitch and roll inputs from the vertical gyro. The circuit boards were designed, manufactured, and assembled with components. The front panel was designed to the customer’s requirement. The chassis box was assembled with the circuit boards, power supplies, and motor drive module. Two cables exit the rear of the test set and connect to the 329B-8 indicator. The scorsby table mounted on top of it met customer's requirements to simulate the aircraft pitch and roll.

• TR5171 Audio Test Panel Printed Circuit Board

This PCB was designed per the schematic in the manufacturer’s maintenance manual. This audio panel used on the SAAB 340 aircraft.

• Telephonics Audio Panel TS502-0108

This is the printed circuit board designed and manufactured per the schematic in the Telephonics Component Maintenance Manual for digital audio panel part number 502-0011 used on the SAAB-340 aircraft.

REPAIR CAPABILITIES

Testing Multi-Function Display 8001671-902 after repair Repair Capabilities on the following circuit card assemblies for MFD 8001671-902

• Video Deflection CCA 8001711-901

• Horizontal Deflection CCA 8001710-901

• Video Processor CCA 8001735-902

• Focus Power Supply Regulator ECA 8502100-901

• High Voltage Power Supply Regulator UCA 8001673-901

• Low Voltage Power Supply ECA 8502094-902, 8502092-901

• JetCal Analyzer Test Set BH112JD-80

Repair, overhaul, and calibration of the test set manufactured by Howell Instruments. The photos show the test set in different stages of the Built-In-Test that verified proper operation. The last photo shows the condition of the units upon receipt. The rough handling of these test sets on the flight line subjects them to much damage. Many are completely inoperative. The test sets undergo a complete teardown. The units are tested to determine the failure. Repairs are accomplished on the printed circuit boards, main chassis, printer, trimmer section, and case. The cases are stripped of old chipped paint and corrosion. The cases are straightened, repainted, and re-silkscreened with new lettering.

Condition of repairable units before overhaul. REPAIR AND OVERHAUL CAPABILITY LIST

BH112JD-80 JetCal Analyzer UG1984B1 Radar Altimeter Test Set UG1984B2 Radar Altimeter Test Set 622-1789-001 TACAN Test Set, 972V-1 58139-40001 Radar Test Set, UPM-145 AD33510-4 Synchrophaser Test Set RT-804/APN-171(V) Radar Altimeter Rcvr-Xmtr RT-804B/APN-171(V) Radar Altimeter Rcvr-Xmtr RT-806A/APN-171(V) Radar Altimeter Rcvr-Xmtr RT-829A/APN-171(V) Radar Altimeter Rcvr-Xmtr RT-1062A/APN-171(V) Radar Altimeter Rcvr-Xmtr RT-1652/APN-171(V) Radar Altimeter Rcvr-Xmtr HG9050D1 Radar Altimeter Rcvr-Xmtr HG9050G1 Radar Altimeter Rcvr-Xmtr HG9050D3 Radar Altimeter Rcvr-Xmtr HG9050G2 Radar Altimeter Rcvr-Xmtr HG9010G2 Radar Altimeter Rcvr-Xmtr

HG9050G12 Radar Altimeter Rcvr-Xmtr HG9010G9 Radar Altimeter Rcvr-Xmtr JG206D1 Height Indicator JG206D2 Height Indicator ID-1345/APN-171(V) Height Indicator ID-1346/APN-171(V) Height Indicator 13ID1001-1 Height Indicator AS-1858/APN-171(V) Radar Altimeter Antenna LG81A1 Radar Altimeter Antenna AD43013-1 Radar Altimeter Antenna 761230-1 Synchrophaser 761230-2 Synchrophaser 766840-1 Synchrophaser 766840-2 Synchrophaser 774800-1 Synchrophaser

VSWR TESTING CAPABILITIES

Radar Altimeter and X-Band Radar Antenna VSWR testing capabilities using HP8757D Network Analyzer and HP 83752A Synthesized Sweep Generator. VSWR testing of radar altimeter antennas LG81A1, AS-1858/APN-171(V), X-Band radar antennas ANT-1T series, AS-653B/APN-59, AS-653C/APN-59, 1889520, 1978367

RE-DESIGNED PRINTED CIRCUIT BOARDS

• PRF Generator Circuit Board 1888197 Circuit board part number 1888197 was designed exactly as the manufacturer's original circuit board. This PCB is used in the RT-289D/APN-59 Radar Receiver-Transmitter part number 1889524 part of the APN-59 radar used on several models of the C-130 aircraft.

• A3101 Board Assembly 4007559-0501 Circuit Board This circuit board was designed exactly as the manufacturer's original circuit board. This circuit board had a design flaw that caused an area under the Berg connector to burn a hole through the board. This circuit board is part of the power supply module in the RT-131A Radar Receiver-Transmitter part number 4000763-3101. The photo shows the comparison of newly designed circuit board on the left and the old damaged one on the right. The burnt area can be seen at several pad holes on connector P3103.

New Board Old Damaged Board

• A3202 Board Assembly 4007599-0501 Circuit Board This circuit board was designed exactly as the manufacturer's original circuit board. This circuit board had a design flaw that caused an area under the Berg connector to burn a hole through the board. This circuit board is part of the power supply module in the RT-131A Radar Receiver-Transmitter part number 4000763-3101. The photo shows the comparison of newly designed circuit board on the left and the old damaged one on the right. The burnt area is right through the center of connector P3204.

New Board Old Damaged Board

SEVERAL VARIOUS PRINTED CIRCUIT BOARDS

70 HZ VCO CARD AD33510-4 Test Set

Phasemeter Card AD33510-4 Test Set

Power Interrupt Card AD33510-4 Test Set

CERTIFICATIONS