SIFT -ARMY AVIATION EXAM QUESTIONS
WITH ANSWERS
Three kinds of Rotor Systems - ANSWER 1. Semirigid - consists of two blades
rigidly mounted to the main rotor hub.
2. Rigid: The blade roots are rigidly linked to the rotor hub.
3. Fully articulated - allow each blade to lead/lag (move back and forth in the
plane), flap (move up and down about an inside mounted hinge), independent of
the other blades, and feather (rotate about the pitch axis to adjust lift).
3 Approaches - ANSWER Normal: 7-12 @ 300-500 AGL
Steep: 13-15.
Shallow: 3–5.
Manufacturers Empty Weight (MEW) - ANSWER The total weight of the
airplane as built. This covers the system's operational components but not the
unusable fuel. before the fluids, fuel, or oil are inserted.
Operating Empty Weight (OEW) is calculated by adding the weight of the crew,
fluids, useless fuel, and flight equipment to the MEW.
All-Up Weight (AUW), also known as Aircraft Gross Weight (AGW), is the
aircraft's weight at any one time during flight. AUW / AGW can drop at any
time during flight.
Maximum Landing Weight (MLW) - ANSWER Aircraft's weight restriction
during landing
, Maximum Zero Fuel Weight (MZFW) - Answer Permissible weight of aircraft
with its contents and unusable fuel; no useable fuel or fluids.
Maximum takeoff weight - ANSWER The maximum permitted weight for
takeoff.
Maximum Ramp Weight (MRW) - Answer The weight restriction for taxiing or
towing an aircraft on the ground.
Parasitic Drag - Answer Non-lifting helicopter components such as the fuselage,
engine cowlings, hub, mast, landing gear, and external loads contribute to this.
The drag is lowest at low speeds and goes to the highest at high speeds.
Profile Drag: ANSWER The spinning airfoils produce drag due to frictional
resistance.
Middle drag at low speeds increases only marginally with speed.
Induced Drag - Answer The airflow circulation across the wing provides lift.
Drag is highest at low speeds and diminishes to its lowest at high speeds.
4 Forces of Hovering - Answer Weight, lift, thrust, and drag are in balance.
WITH ANSWERS
Three kinds of Rotor Systems - ANSWER 1. Semirigid - consists of two blades
rigidly mounted to the main rotor hub.
2. Rigid: The blade roots are rigidly linked to the rotor hub.
3. Fully articulated - allow each blade to lead/lag (move back and forth in the
plane), flap (move up and down about an inside mounted hinge), independent of
the other blades, and feather (rotate about the pitch axis to adjust lift).
3 Approaches - ANSWER Normal: 7-12 @ 300-500 AGL
Steep: 13-15.
Shallow: 3–5.
Manufacturers Empty Weight (MEW) - ANSWER The total weight of the
airplane as built. This covers the system's operational components but not the
unusable fuel. before the fluids, fuel, or oil are inserted.
Operating Empty Weight (OEW) is calculated by adding the weight of the crew,
fluids, useless fuel, and flight equipment to the MEW.
All-Up Weight (AUW), also known as Aircraft Gross Weight (AGW), is the
aircraft's weight at any one time during flight. AUW / AGW can drop at any
time during flight.
Maximum Landing Weight (MLW) - ANSWER Aircraft's weight restriction
during landing
, Maximum Zero Fuel Weight (MZFW) - Answer Permissible weight of aircraft
with its contents and unusable fuel; no useable fuel or fluids.
Maximum takeoff weight - ANSWER The maximum permitted weight for
takeoff.
Maximum Ramp Weight (MRW) - Answer The weight restriction for taxiing or
towing an aircraft on the ground.
Parasitic Drag - Answer Non-lifting helicopter components such as the fuselage,
engine cowlings, hub, mast, landing gear, and external loads contribute to this.
The drag is lowest at low speeds and goes to the highest at high speeds.
Profile Drag: ANSWER The spinning airfoils produce drag due to frictional
resistance.
Middle drag at low speeds increases only marginally with speed.
Induced Drag - Answer The airflow circulation across the wing provides lift.
Drag is highest at low speeds and diminishes to its lowest at high speeds.
4 Forces of Hovering - Answer Weight, lift, thrust, and drag are in balance.
