AMS 274 TURBINES UNIT 3 EXAM
REVIEW (HANCOCK) EXAM WITH
CORRECT QUESTIONS AND ANSWERS
2025
State three functions of the oil tanks overboard relief valve: - CORRECT-ANSWERS1. Maintains
positive pressure
2. Vents to prevent tank failure
3. Allows depressurization of tank at shutdown
What is the function of the oil tanks dwell chamber? - CORRECT-ANSWERSSeparates air from
the oil (bleeds it out from the scavenge system)
What is the position of the internal valves of the pressurizing and vent valves when the aircraft
is on the ground? - CORRECT-ANSWERSAneroid valve is open
What is the position of the internal valves of the pressurizing and vent valves when the aircraft
is at 20k ft? - CORRECT-ANSWERSAneroid begins to open at around 8000-10000 ft, and will be
completely closed at 20000 ft
What is a "hot tank"? - CORRECT-ANSWERSThe cooler is located in the pressure subsystem
, What is a "cold tank"? - CORRECT-ANSWERSThe cooler is located in the scavenge system
Explain trimming: - CORRECT-ANSWERSAlso known as tuning, is when you make adjustments to
the fuel control system for idle and max power (there are 2 adjustments)
Explain the thermostatic valve position and flow of fuel and oil when the oil is cold in a fuel/oil
cooler: - CORRECT-ANSWERSThe thermostatic valve is open and ONLY fuel is flowing
Explain the thermostatic valve position and flow of fuel and oil when the oil is hot in a fuel/oil
cooler: - CORRECT-ANSWERSThe thermostatic valve is closed and forces oil through the cooler
with the fuel (the two mix and oil heats the fuel)
Oil jets: - CORRECT-ANSWERSFixed nozzles that apply constant flow to all the bearings (fixed
nozzles used for this reason)
Chip detector: - CORRECT-ANSWERSChecks for the presence of ferrous material due to internal
breakdown
What happens when ferrous pieces get into a chip detector? - CORRECT-ANSWERSWhen chips
get in they attach to the magnet and complete the circuit to the electrode and cause a chip light
to illuminate in the cockpit
REVIEW (HANCOCK) EXAM WITH
CORRECT QUESTIONS AND ANSWERS
2025
State three functions of the oil tanks overboard relief valve: - CORRECT-ANSWERS1. Maintains
positive pressure
2. Vents to prevent tank failure
3. Allows depressurization of tank at shutdown
What is the function of the oil tanks dwell chamber? - CORRECT-ANSWERSSeparates air from
the oil (bleeds it out from the scavenge system)
What is the position of the internal valves of the pressurizing and vent valves when the aircraft
is on the ground? - CORRECT-ANSWERSAneroid valve is open
What is the position of the internal valves of the pressurizing and vent valves when the aircraft
is at 20k ft? - CORRECT-ANSWERSAneroid begins to open at around 8000-10000 ft, and will be
completely closed at 20000 ft
What is a "hot tank"? - CORRECT-ANSWERSThe cooler is located in the pressure subsystem
, What is a "cold tank"? - CORRECT-ANSWERSThe cooler is located in the scavenge system
Explain trimming: - CORRECT-ANSWERSAlso known as tuning, is when you make adjustments to
the fuel control system for idle and max power (there are 2 adjustments)
Explain the thermostatic valve position and flow of fuel and oil when the oil is cold in a fuel/oil
cooler: - CORRECT-ANSWERSThe thermostatic valve is open and ONLY fuel is flowing
Explain the thermostatic valve position and flow of fuel and oil when the oil is hot in a fuel/oil
cooler: - CORRECT-ANSWERSThe thermostatic valve is closed and forces oil through the cooler
with the fuel (the two mix and oil heats the fuel)
Oil jets: - CORRECT-ANSWERSFixed nozzles that apply constant flow to all the bearings (fixed
nozzles used for this reason)
Chip detector: - CORRECT-ANSWERSChecks for the presence of ferrous material due to internal
breakdown
What happens when ferrous pieces get into a chip detector? - CORRECT-ANSWERSWhen chips
get in they attach to the magnet and complete the circuit to the electrode and cause a chip light
to illuminate in the cockpit
