TRACE FUEL METERING AND ENGINE CONTROL SIGNALS
WWAOG Technical Academy
ATA 73 • Grand Caravan EX • PT6A-140

TM-046 | Grand Caravan EX Engine Fuel Metering & Diagnostic Testing

Connected fuel and control paths

Follow pump delivery, FCU metering, Ng feedback and P3/Py governing signals

Interpret specific test records

Distinguish duplex-nozzle spray quality, internal cross-leakage and external leaks

Explain cause and prove restoration

Connect each symptom to its physical route and the evidence needed after correction
Trace Grand Caravan EX fuel through the heater, pump, FCU, flow divider and fourteen duplex nozzles. Understand how mechanical Ng feedback, compressor-discharge P3 air and Py governing air influence fuel delivery. Follow shutdown-fuel recovery and distinguish actual metering faults from fuel-flow indication faults.

What's included?

  • 8 focused lessons
  • Completion certificate
  • 40-question final
  • 8 guided fault cases
  • Illustrated student handbook

Understand the connected system

Learn how fuel conditioning, pump delivery, FCU demand and feedback, nozzle distribution and ecology recovery work together. Practice identifying designed pneumatic bleed outlets, interpreting a latched filter indicator, and separating nozzle spray defects from internal and external leakage. Each test record names the component, method and study criterion.

Practice defensible fault isolation

Complete eight lessons, six prediction-and-Apply exercises, eight two-stage cases and six fixed diagnostic records. All 24 lab requirements must be complete. The twelve-decision independent review requires at least 80% and all eight critical decisions correct in the same attempt. The separate forty-question final requires at least 32 correct answers. The online certificate requires the handbook, mastered lab and final pass; practical qualification is separate.