Fuel Pump Filter Differential Pressure Switch Repair & Overhaul
42D394 — Fuel Pump Filter Differential Pressure Switch Repair & Overhaul
| Part number | 42D394 |
|---|---|
| Nomenclature | Fuel Pump Filter Differential Pressure Switch |
| Manufacturer | Custom Control Sensors |
| Aircraft make | Pratt & Whitney |
| Aircraft model | PW2000/4000 |
| Capability | Differential Pressure Switches |
FAA & EASA Part 145 repair & overhaul. We'll confirm turnaround and pricing.
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Component Overview
A fuel pump filter differential pressure switch monitors the pressure drop across a fuel filter element and actuates when that differential rises to a set limit, indicating filter clogging or impending bypass. Mounted at the fuel pump filter within the sensors and switches domain, it provides crew indication or impending-bypass warning so contaminated or restricted filters are detected before unfiltered fuel passes downstream. The switch senses upstream and downstream pressure across a diaphragm or piston that closes contacts at the setpoint. Repair and overhaul are driven by diaphragm fatigue and rupture, contact erosion and pitting, calibration drift of the differential setpoint, spring fatigue, fuel-side contamination and corrosion, seal and O-ring degradation causing leakage, and electrical terminal deterioration that produces false indications or failure to actuate.
Aircraft Application
Part number 42D394 (Fuel Pump Filter Differential Pressure Switch) is installed on the Pratt & Whitney PW2000/4000. QTC supports operators and MROs servicing this platform with certified repair and overhaul.
Our Repair Capability
QTC repairs and overhauls 42D394 to the original manufacturer's specifications under our FAA and EASA Part 145 approvals. Our team — including former OEM sensors & switches engineers — performs teardown, inspection, cleaning, component replacement, functional testing, and certification, returning a serviceable unit with the appropriate airworthiness release. We also develop repairs for rejected and beyond-economic-repair (BER) hardware.
Related Parts
Other fuel pump filter differential pressure switch part numbers we repair — view all Fuel Pump Filter Differential Pressure Switch parts →
Frequently Asked Questions
Can QTC repair part number 42D394?
Yes. 42D394 (Fuel Pump Filter Differential Pressure Switch) is within QTC's FAA & EASA Part 145 repair and overhaul capability. Request a quote to confirm current turnaround and pricing.
What aircraft is part 42D394 used on?
42D394 is used on the Pratt & Whitney PW2000/4000.
What condition does QTC accept for 42D394?
QTC accepts serviceable, unserviceable, and beyond-economic-repair (BER) units for evaluation. Our engineers determine the most cost-effective repair path after incoming inspection.
What is the typical turnaround time for fuel pump filter differential pressure switch repair?
Turnaround depends on repair scope and material availability. Contact QTC for a current estimate.
Request a Quote for 42D394
Send us the part number and condition and our engineers will respond with repair scope, turnaround, and pricing.