AMS 274 UNIT 4 QUESTIONS WITH
COMPLETE VERIFIED ANSWERS
\.A typical Gear ratio for an air turbine starter is 25:1. If the turbine is rotating @
80,000 RPM's, what would the input RPM be to the gear box? - ANSWERS✔-3,200
RPM
\.With a variable vane system when will the vanes be most closed? - ANSWERS✔-
at Low RPM
\.What happens if the vanes are stuck in the open position? - ANSWERS✔-Engine
will stall in low power
\.A clicking noise heard from an air turbine starter on engine coast down is a
result of what? - ANSWERS✔-Pawls re-engaging and riding the ratchet in case we
need a re-start
\.Which igniter plug requires special handling due to semi-conductor material? -
ANSWERS✔-Low voltage shunted surface gap (Self Ionizing)
\.What does the semi conductor material do when its HOT and COLD? -
ANSWERS✔-Cold- Conducts
Hot- Isolates
, \.What is autoignition and what does it sense? - ANSWERS✔-Ensures
instantaneous igniton if an engine loses power. Senses Torque, Oil Pressure, and
loss of Compressure dischatge pressure
\.What positions are fail type anti-ice valves in? - ANSWERS✔-Powered closed and
spring loaded open
\.What instrument indication would you most likely see when engine anti-ice is
turned on? - ANSWERS✔-Slight Rise in EGT (10 Degrees)
\.Starting sequence - ANSWERS✔-Starter, Ignition, Fuel
\.When do you disengage the starter? - ANSWERS✔-When it reaches self
accelerating speed
\.Where is the Pressure Regulating and Shutoff valve located? - ANSWERS✔-
Pneumatic starter Unit
\.What does the PRSV do? (Pressure Regulating, and Shutoff valve) - ANSWERS✔-
controls airflow to the pneumatic starter
\.What parameter is the most critical to observe? - ANSWERS✔-TIT
\.What indicates a successful start on a turbine engine? - ANSWERS✔-Rise in EGT
COMPLETE VERIFIED ANSWERS
\.A typical Gear ratio for an air turbine starter is 25:1. If the turbine is rotating @
80,000 RPM's, what would the input RPM be to the gear box? - ANSWERS✔-3,200
RPM
\.With a variable vane system when will the vanes be most closed? - ANSWERS✔-
at Low RPM
\.What happens if the vanes are stuck in the open position? - ANSWERS✔-Engine
will stall in low power
\.A clicking noise heard from an air turbine starter on engine coast down is a
result of what? - ANSWERS✔-Pawls re-engaging and riding the ratchet in case we
need a re-start
\.Which igniter plug requires special handling due to semi-conductor material? -
ANSWERS✔-Low voltage shunted surface gap (Self Ionizing)
\.What does the semi conductor material do when its HOT and COLD? -
ANSWERS✔-Cold- Conducts
Hot- Isolates
, \.What is autoignition and what does it sense? - ANSWERS✔-Ensures
instantaneous igniton if an engine loses power. Senses Torque, Oil Pressure, and
loss of Compressure dischatge pressure
\.What positions are fail type anti-ice valves in? - ANSWERS✔-Powered closed and
spring loaded open
\.What instrument indication would you most likely see when engine anti-ice is
turned on? - ANSWERS✔-Slight Rise in EGT (10 Degrees)
\.Starting sequence - ANSWERS✔-Starter, Ignition, Fuel
\.When do you disengage the starter? - ANSWERS✔-When it reaches self
accelerating speed
\.Where is the Pressure Regulating and Shutoff valve located? - ANSWERS✔-
Pneumatic starter Unit
\.What does the PRSV do? (Pressure Regulating, and Shutoff valve) - ANSWERS✔-
controls airflow to the pneumatic starter
\.What parameter is the most critical to observe? - ANSWERS✔-TIT
\.What indicates a successful start on a turbine engine? - ANSWERS✔-Rise in EGT
