PNG CASA Basic Gas Turbine case studies
PNG CASA Basic Gas Turbine · Put your knowledge to work in context.
The Basic Gas Turbine examination is a PNG CASA licence knowledge assessment for aircraft maintenance engineers who want a gas turbine rating on their licence, or who need to satisfy the authority that they understand turbine engines before working on them under supervision. It is aimed at people with a grounding in airframe and powerplant fundamentals who are moving into turbine-powered types, and at experienced piston-engine engineers extending their scope. The PNG CASA Basic Gas Turbine case studies are 5 cases and about 2,079 words.
1High-Density-Altitude Lift Decision
You are the duty line engineer at a PNG highlands helicopter base. Field elevation is 1,650 m, QNH 1008 hPa, and the shaded air temperature is 31 °C.
459 words, about 2 min2Rising Oil Consumption on a Turboprop
During a 100-hour inspection of a twin-engine turboprop, the right engine's oil consumption has risen from 0.10 L/h to 0.38 L/h over the last 35 h. The oil filter element shows a light grey sludge but no metallic flakes; the chip detector has fine ferrous fuzz less than 1 mm.
412 words, about 2 min3Aborted Start With Rising ITT
At 05:40 at a coastal PNG airfield, you attempt to start a turboprop engine using the aircraft battery. OAT is 24 °C, battery voltage is 22.4 V before start, and external power is not available.
392 words, about 2 min4Engine Change With Calibration and Rigging Gaps
You are the maintenance controller for a PNG charter operator. An engine was removed and replaced after a compressor failure.
398 words, about 2 min5Cross-Engine ITT Spread in Cruise
A twin-engine turboprop is reported by the crew: at the same torque setting, the left engine shows ITT 22 °C higher and N1 1.2 % lower than the right, with fuel flow about 40 kg/h higher. The discrepancy appeared gradually over the last 60 h and is most noticeable in cruise at 20,000 ft.
418 words, about 2 min