P/N 026007UL101 Receiver — Intrinsically Safe
UL101 receiver with analog meter, gain control and headset jack, certified for hazardous (intrinsically safe) environments.
CTRL UL101 Aviation Troubleshooter
P/N: B00033Boeing: SPL-1473
Acoustic Ultrasound Detection System for Precision Aviation Maintenance
The CTRL UL101 Aviation Troubleshooter is an industrial-grade ultrasonic detection system that assists technicians in rapidly pinpointing pneumatic, hydraulic, electrical, and mechanical faults in aircraft maintenance. Operating at 40 kHz, the UL101 converts ultrasonic activity into the audible range, providing an intuitive and non-destructive method for identifying issues that traditional methods often miss. This tool transforms time-consuming troubleshooting into pinpoint diagnostics. Many users report 100% ROI in the first or second use.
Other Buying Options— all authorized distribution partners
Real-World Success Stories
Boeing 737 MAX — CFM LEAP 1-B Fuel Nozzle Inspection
Case Study 1 of 4
1The Problem
A Boeing 737 MAX CFM LEAP 1-B engine developed a recurring fuel nozzle anomaly. Traditional troubleshooting required borescope inspection and often led to blanket replacement of all 18 fuel nozzles — consuming hours of engine downtime and introducing contamination risk each time the combustor was opened.
2The Solution
Technicians deployed the UL101 Aviation Troubleshooter (B00033) to listen for the ultrasonic signature of internal leakage at each nozzle. Within minutes the single defective nozzle was isolated acoustically — without any borescope or intrusive disassembly.
3The Results
- Reduced diagnostic time to under 60 minutes
- Eliminated borescope contamination risk
- Identified the single failing nozzle vs. replacing all 18
- No special certification required for technicians
- Returned the engine to service the same shift
Boeing Tool Coverage
Boeing Special Tool: SPL-1473
Purpose-built for SPL-1473
The CTRL UL101 Aviation Troubleshooter (P/N B00033) IS Boeing tool tag SPL-1473 — the handheld ultrasonic leak-detection probe the Boeing AMM calls out for cabin pressurization, air-cycle-machine, hydraulic bypass, and pressurized-component leak checks.
Boeing AMM Tasks That Reference SPL-1473
- Task 20-10-79-270-801Ultrasonic Leak Detection Checks (cabin pressurization, A/C, bleed air, hydraulic bypass, parking brake, pitot-static, oxygen, tires & pressurized components)
- Task —Intermittent Wiring — Inspection / Check
- Task —Vacuum Tool Leak Check of the Door Seal (Fwd + Aft entry doors)
- Task —Parking Brake Pressure Decrease — Fault Isolation (set + released)
- Task —Doors, Hatches, & No. 2 Window — Leak Test
- Task —Cabin Air Compressor (Health Check) — Leak Test
- Task —Pack Cooling & Temperature Control System (CACTCS) — Operational Test
- Task —Air Cycle Machine + Heat Exchanger + Bypass / Low-Limit / Economy Cooling Valve — Installation
Task references sourced from Boeing AMM documentation supplied by our customers. Coverage of individual tail-numbers depends on the operator's minor-model / revision applicability.
Part number for SPL-1473
| Part Number | Supplier | Notes |
|---|---|---|
| B00033 | 62373 (CTRL Systems) | CTRL UL101 Aviation Troubleshooter — SPL-1473 |
Technology
Why the UL101 Offers Superior Sound Quality
The UL101 uses a proprietary non-heterodyne method to convert ultrasonic activity around 40 kHz into an audible signal. Unlike a typical heterodyne instrument, it does not rely on an internally generated mixing signal to create the sound the technician hears.
The practical result is an exceptionally quiet baseline, high usable signal-to-noise and a simple "point, listen and pinpoint" workflow — especially well suited to aviation maintenance troubleshooting. The UL101's non-heterodyne architecture reflects a specific design priority: helping AMTs locate weak, localized ultrasonic sources quickly and clearly.
A quieter headset baseline
At appropriate sensitivity settings an AMT hears very little when no meaningful ultrasonic source is present — so a small leak, discharge or bypass emerges distinctly instead of being layered over electronic chatter.
High usable signal-to-noise
What matters in troubleshooting is how clearly a weak fault signal stands out from the instrument's own audible background. The UL101 is designed around that practical distinction, not raw gain.
Fixed around 40 kHz — by design
The UL101 listens in a tightly controlled band centered near 40 kHz, the region most useful for turbulent leaks and electrical discharge. No hunting for a listening frequency: adjust sensitivity and close in.
Scan, hear a change, pinpoint
Progressive sensitivity reduction and probe directionality let a technician separate one source from nearby components — fast, and often without disassembly just to begin the search.
Boeing AMM / FIM Task Finder
Which Boeing tasks call out the UL101?
Pick your airplane model to see every Boeing AMM and FIM task that lists tool tag SPL-1473 — the CTRL UL101 (P/N B00033).
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Source: Boeing tool details for B00033 (reference only). Task numbers vary by minor model and revision — always follow your operator's current AMM / FIM.
7 tasks for Boeing 737-600 / -700 / -800 / -900
Ultrasonic leak detection
- AMM20-10-79-270-801Ultrasonic Leak Detection Checks
Intermittent wiring inspection
- AMM20-70-24-200-801Intermittent Wiring Inspection and Check - Special Detailed Inspection
Door, hatch & window leak checks
- AMM52-11-00-700-805Vacuum Tool Leak Check of the Forward Entry Door Seal
- AMM52-13-00-700-806Vacuum Tool Leak Check of the Aft Entry Door Seal
Parking brake fault isolation
- FIM32-44-00-810-801Parking Brake Pressure Decreases Faster Than Permitted with the Parking Brake Set - Fault Isolation
- FIM32-44-00-810-802Parking Brake Pressure Decreases Faster Than Permitted with the Parking Brake Released- Fault Isolation
Oxygen system fault isolation
- FIM35-12-00-810-802Crew Oxygen Pressure Indicator - Pressure Decreases - Fault Isolation
Product Details
Technical Specifications
Part NumberB00033
Boeing Tool TagSPL-1473
Operating Frequency40 kHz ± 1.5 kHz
Frequency Bandwidth1.8-2.2 kHz @ -3 dB SPL
Detection Range150 feet (45 meters)
Sensitivity Threshold10⁻¹²W/m² (0 dB SPL)
Minimum Ultrasonic Pressure2.0 x 10⁻⁵ PA @ 40 kHz
Operating Temperature-20°F to 130°F (-4°C to 54°C)
Battery Life45+ hours continuous use (9V alkaline)
Receiver Dimensions8.75" x 1.26" x 1.26" (222 x 32 x 32 mm)
Receiver Weight11.6 oz (330 grams)
Transmitter Dimensions4.125" x 1.26" x 1.26" (105 x 32 x 32 mm)
Transmitter Weight6.2 oz (175 grams)
Housing MaterialIndustrial Grade Extruded Aluminum (2.3mm wall)
Headset Impedance600 Ohm with 21 dB noise attenuation
Intrinsic SafetyANSI/UL 913-88 Division 1 & 2 Certified
Warranty6-Year Parts & Labor
CalibrationBiennial sensitivity validation required
Kit components & replacement parts
Every B00033 / SPL-1473 component, available individually
Lost a probe, need a spare headset or a second case? Each component of the UL101 Aviation Troubleshooter kit can be purchased on its own — from our distribution partner AvionTEq or directly from CTRL Systems. Add every part you need to the quote list and send one request.
Tick what's in your case — reorder the rest in one go.
22 parts
P/N 026007
P/N 026012UT2000 Universal Transmitter — Intrinsically Safe
Intrinsically safe ultrasonic tone generator for seal, duct and enclosure leak checks without pressurization.
P/N 026305 SetUT2000 Cabin Multi-Pak — Set of 4
Four UT2000 transmitters in an orange NANUK 903 case — place one per cabin zone for full pressurization leak checks in a single pass.
P/N 026310 SetUT2000 Cabin Multi-Pak — Set of 8
Eight UT2000 transmitters in an orange NANUK 903 case for wide-body cabins and simultaneous multi-zone door, window and seal checks.
P/N 0700351-inch Metal Acoustic Probe
Short acoustic (scan mode) probe that threads directly onto the UL101 receiver.
P/N B00005 SetAcoustic Extension Probe Set (5 pc.)
Double-threaded adapter, two 12" double-threaded probes, one 12" single-threaded probe and a flex acoustic tube for reaching into ducts and tight bays.
P/N 070005Double-Threaded Adapter
Couples the receiver to the extension probes.
Included in set P/N B00005 · also sold individually
P/N 07004512-inch Acoustic Probe — Double-Threaded End
Aluminum extension probe, threaded both ends so probes can be chained (two included in the set).
Included in set P/N B00005 · also sold individually
P/N 07005012-inch Acoustic Probe — Single-Threaded End
Aluminum extension probe with an open sensing end; attaches last in the chain.
Included in set P/N B00005 · also sold individually
P/N 070055Flex Acoustic Tube
Bendable segmented acoustic tube that holds its shape for listening around corners and behind components.
Included in set P/N B00005 · also sold individually
P/N 000050 SetSolid Probe Set (4 pc.)
13", 8", 5" and 3" solid probes for contact-mode inspection of valves, bearings and hydraulic bypass.
P/N 04006013-inch Solid Probe
Longest standard contact probe for reaching recessed components.
Included in set P/N 000050 · also sold individually
P/N 0400558-inch Solid Probe
Mid-length contact probe.
Included in set P/N 000050 · also sold individually
P/N 0400505-inch Solid Probe
Short contact probe for confined spaces.
Included in set P/N 000050 · also sold individually
P/N 040045
3-inch Solid Probe
Shortest contact probe.
Included in set P/N 000050 · also sold individually
P/N 000065 SetConcentrator Set (3 pc.)
Large concentrator, mini concentrator and acoustic tip for narrowing the receiving field and pinpointing leaks.
P/N 070007Large Concentrator
Horn-style concentrator for scanning wide areas at distance.
Included in set P/N 000065 · also sold individually
P/N 070009Mini Concentrator
Compact concentrator for closer work.
Included in set P/N 000065 · also sold individually
P/N 070037Delrin Acoustic Tip
Narrow Delrin tip for pinpointing the exact leak source.
Included in set P/N 000065 · also sold individually
P/N 025020Industrial Headset — Over-the-Head
Noise-isolating headset with coiled cord for the UL101 receiver.
P/N 025035Headset Cable — Coiled, mini-XLR
Replacement coiled cord connecting the headset to the UL101 receiver jack.
P/N 020019Carrying Case with UL101 Inserts
Orange NANUK 920 hard case with custom foam for the complete B00033 kit.
Pricing and availability for individual parts are provided by AvionTEq or on quote from CTRL Systems. Add as many parts as you need to the quote list and send them to CTRL in a single request. The B00033 kit ships with the intrinsically safe receiver and transmitter — check the label on your existing unit before ordering.
Ready to Get Started?
Contact us today for a demonstration or to discuss your specific requirements.
Other Recommended Products
UL101 Compact Ultrasonic Inspection and Imaging Kit (B00705)
The complete UL101 kit plus the FOTRIC H4mini acoustic imaging camera — see the leak, then confirm it.
UT2000 Cabin Multi-Pak — Set of 4 (026305)
Four UT2000 transmitters in a NANUK 903 case for full-cabin pressurization leak checks.
UT2000 Cabin Multi-Pak — Set of 8 (026310)
Eight UT2000 transmitters for wide-body cabins and simultaneous multi-zone checks.
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