Science Engineering Mechanical Engineering
AMS 274 Unit 4 ACTUAL 2025/2026 QUESTIONS
AND 100% CORRECT ANSWERS
A typical Gear ratio for an air turbine starter 3,200 RPM
is 25:1. If the turbine is rotating @ 80,000
RPM's, what would the input RPM be to the
gear box?
With a variable vane system when will at Low RPM
the vanes be most closed?
What happens if the vanes are stuck in the Engine will stall in low power
open position?
A clicking noise heard from an air turbine Pawls re-engaging and riding the ratchet in case we need a
starter on engine coast down is a result of re-start
what?
Which igniter plug requires special handling Low voltage shunted surface gap (Self Ionizing)
due to semi-conductor material?
What does the semi conductor material do Cold- Conducts
when its HOT and COLD? Hot- Isolates
What is autoignition and what does it sense? 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 Powered closed and spring loaded open
in?
What instrument indication would you most Slight Rise in EGT (10 Degrees)
likely see when engine anti-ice is turned
on?
Starting sequence Starter, Ignition, Fuel
When do you disengage the starter? When it reaches self accelerating speed
Where is the Pressure Regulating and Pneumatic starter Unit
Shutoff valve located?
What does the PRSV do? (Pressure controls airflow to the pneumatic starter
Regulating, and Shutoff valve)
What parameter is the most critical to TIT
observe?
What indicates a successful start on a Rise in EGT
turbine engine?
AMS 274 Unit 4 ACTUAL 2025/2026 QUESTIONS
AND 100% CORRECT ANSWERS
A typical Gear ratio for an air turbine starter 3,200 RPM
is 25:1. If the turbine is rotating @ 80,000
RPM's, what would the input RPM be to the
gear box?
With a variable vane system when will at Low RPM
the vanes be most closed?
What happens if the vanes are stuck in the Engine will stall in low power
open position?
A clicking noise heard from an air turbine Pawls re-engaging and riding the ratchet in case we need a
starter on engine coast down is a result of re-start
what?
Which igniter plug requires special handling Low voltage shunted surface gap (Self Ionizing)
due to semi-conductor material?
What does the semi conductor material do Cold- Conducts
when its HOT and COLD? Hot- Isolates
What is autoignition and what does it sense? 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 Powered closed and spring loaded open
in?
What instrument indication would you most Slight Rise in EGT (10 Degrees)
likely see when engine anti-ice is turned
on?
Starting sequence Starter, Ignition, Fuel
When do you disengage the starter? When it reaches self accelerating speed
Where is the Pressure Regulating and Pneumatic starter Unit
Shutoff valve located?
What does the PRSV do? (Pressure controls airflow to the pneumatic starter
Regulating, and Shutoff valve)
What parameter is the most critical to TIT
observe?
What indicates a successful start on a Rise in EGT
turbine engine?
