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FAA COMMERCIAL PILOT KNOWLEDGE
EXAM (CAX) 2026/2027 QUESTIONS WITH
VERIFIED ANSWERS & COMPLETE
RATIONALES
**1. Which class of airspace requires two-way radio
communication before entry?**
A. Class G
B. Class E
C. Class C
D. Class G above 1,200 feet AGL only
**Correct answer:** C
**Rationale:** Before entering Class C airspace, the pilot must
establish two-way radio communication with the appropriate
ATC facility. Hearing the aircraft's callsign satisfies this
requirement. Class G and Class E do not require mandatory
radio communication for VFR flight .
---
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**2. During a steep turn, the load factor increases primarily
because:**
A. Airspeed decreases
B. Lift must increase to support the airplane
C. Drag disappears
D. Weight decreases
**Correct answer:** B
**Rationale:** As bank angle increases, additional lift is
required to support the aircraft's weight. This increased lift
results in a higher load factor. In a level coordinated turn,
increasing bank angle increases load factor, requiring a higher
angle of attack for level flight .
---
**3. Which atmospheric condition is most favorable for
carburetor icing?**
A. Very cold and dry air
B. Warm, humid air at partial power
C. Hot, dry desert conditions
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D. Extremely high altitude only
**Correct answer:** B
**Rationale:** Carburetor icing commonly develops when
temperatures are moderate and humidity is high, especially
with reduced power settings. The temperature range of -5°C to
+15°C with high humidity is most conducive to carburetor ice
formation .
---
**4. If the center of gravity moves aft within allowable limits, the
airplane generally becomes:**
A. More stable longitudinally
B. Easier to recover from stalls
C. Less stable longitudinally
D. Unable to take off
**Correct answer:** C
**Rationale:** An aft center of gravity reduces longitudinal
stability, making stall recovery more difficult and increasing the
risk of loss of control. The restoring pitching moment after a
disturbance is reduced, making the aircraft less stable in pitch .
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---
**5. Vx is defined as the speed that provides:**
A. Maximum endurance
B. Best angle of climb
C. Best glide distance
D. Best rate of descent
**Correct answer:** B
**Rationale:** Vx provides the greatest altitude gain over the
shortest horizontal distance and is used to clear obstacles after
takeoff. Best angle of climb is critical when obstacle clearance
is the primary concern .
---
**6. Vy is the speed for:**
A. Maximum range
B. Best rate of climb
C. Best glide speed
FAA COMMERCIAL PILOT KNOWLEDGE
EXAM (CAX) 2026/2027 QUESTIONS WITH
VERIFIED ANSWERS & COMPLETE
RATIONALES
**1. Which class of airspace requires two-way radio
communication before entry?**
A. Class G
B. Class E
C. Class C
D. Class G above 1,200 feet AGL only
**Correct answer:** C
**Rationale:** Before entering Class C airspace, the pilot must
establish two-way radio communication with the appropriate
ATC facility. Hearing the aircraft's callsign satisfies this
requirement. Class G and Class E do not require mandatory
radio communication for VFR flight .
---
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**2. During a steep turn, the load factor increases primarily
because:**
A. Airspeed decreases
B. Lift must increase to support the airplane
C. Drag disappears
D. Weight decreases
**Correct answer:** B
**Rationale:** As bank angle increases, additional lift is
required to support the aircraft's weight. This increased lift
results in a higher load factor. In a level coordinated turn,
increasing bank angle increases load factor, requiring a higher
angle of attack for level flight .
---
**3. Which atmospheric condition is most favorable for
carburetor icing?**
A. Very cold and dry air
B. Warm, humid air at partial power
C. Hot, dry desert conditions
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D. Extremely high altitude only
**Correct answer:** B
**Rationale:** Carburetor icing commonly develops when
temperatures are moderate and humidity is high, especially
with reduced power settings. The temperature range of -5°C to
+15°C with high humidity is most conducive to carburetor ice
formation .
---
**4. If the center of gravity moves aft within allowable limits, the
airplane generally becomes:**
A. More stable longitudinally
B. Easier to recover from stalls
C. Less stable longitudinally
D. Unable to take off
**Correct answer:** C
**Rationale:** An aft center of gravity reduces longitudinal
stability, making stall recovery more difficult and increasing the
risk of loss of control. The restoring pitching moment after a
disturbance is reduced, making the aircraft less stable in pitch .
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---
**5. Vx is defined as the speed that provides:**
A. Maximum endurance
B. Best angle of climb
C. Best glide distance
D. Best rate of descent
**Correct answer:** B
**Rationale:** Vx provides the greatest altitude gain over the
shortest horizontal distance and is used to clear obstacles after
takeoff. Best angle of climb is critical when obstacle clearance
is the primary concern .
---
**6. Vy is the speed for:**
A. Maximum range
B. Best rate of climb
C. Best glide speed
