ASTM NCATT Onboard Communications and Safety
Systems (OCS) Endorsement Newest (2025 - 2026
Update) From Real Past Papers Questions – A Set
Of 100 Most Common Exam Frequently Tested
Questions And Answers In Details 100% Verified
Exam Highly Recommendable For Grade A+
1. What is the primary purpose of the aircraft passenger address (PA) system?
A. Engine monitoring
B. Weather radar operation
C. Passenger communication
D. Fuel balancing
Answer: C. Passenger communication
Explanation: The PA system enables the flight crew or cabin crew to communicate
important information and emergency instructions to passengers.
2. Which onboard communication system allows direct communication
between flight deck and cabin crew?
A. Weather radar
B. Flight interphone
C. ELT
D. TCAS
Answer: B. Flight interphone
Explanation: The flight interphone provides continuous communication between
cockpit and cabin personnel.
3. What is the primary purpose of a cockpit voice recorder (CVR)?
A. Record passenger conversations
, B. Record ATC radar
C. Record cockpit audio for accident investigation
D. Record engine parameters
Answer: C. Record cockpit audio for accident investigation
Explanation: The CVR captures crew communications and cockpit sounds to aid
accident investigators.
4. The emergency locator transmitter (ELT) automatically activates after:
A. Cabin depressurization
B. Hard impact or crash
C. Engine shutdown
D. Landing gear extension
Answer: B. Hard impact or crash
Explanation: Most ELTs activate automatically when they sense significant impact
forces.
5. Which frequency is internationally associated with modern satellite-
monitored ELTs?
A. 121.5 MHz
B. 243 MHz
C. 406 MHz
D. 108 MHz
Explanation: 406 MHz ELTs provide digital distress signals with aircraft
identification.
6. The purpose of the cabin interphone is to:
A. Navigate the aircraft
B. Communicate between crew stations
C. Control cabin lighting
D. Operate weather radar
Answer: B. Communicate between crew stations
, Explanation: Interphone systems provide internal communications throughout the
aircraft.
7. Emergency lighting is powered primarily by:
A. Engine oil pressure
B. Backup batteries
C. Fuel pumps
D. Hydraulic pressure
Answer: B. Backup batteries
Explanation: Emergency lighting remains operational after loss of normal aircraft
electrical power.
8. Floor proximity escape path lighting assists passengers during:
A. Cruise flight
B. Taxi operations
C. Emergency evacuation
D. Aircraft servicing
Answer: C. Emergency evacuation
Explanation: Low-level lighting remains visible even in smoke-filled cabins.
9. Smoke detectors installed in aircraft lavatories primarily protect against:
A. Fuel leaks
B. Unauthorized smoking
C. Cabin pressure loss
D. Hydraulic leaks
Answer: B. Unauthorized smoking
Explanation: Lavatory smoke detectors provide early fire detection.
10.Cargo compartment smoke detectors primarily provide:
A. Fire suppression
B. Fire detection
Systems (OCS) Endorsement Newest (2025 - 2026
Update) From Real Past Papers Questions – A Set
Of 100 Most Common Exam Frequently Tested
Questions And Answers In Details 100% Verified
Exam Highly Recommendable For Grade A+
1. What is the primary purpose of the aircraft passenger address (PA) system?
A. Engine monitoring
B. Weather radar operation
C. Passenger communication
D. Fuel balancing
Answer: C. Passenger communication
Explanation: The PA system enables the flight crew or cabin crew to communicate
important information and emergency instructions to passengers.
2. Which onboard communication system allows direct communication
between flight deck and cabin crew?
A. Weather radar
B. Flight interphone
C. ELT
D. TCAS
Answer: B. Flight interphone
Explanation: The flight interphone provides continuous communication between
cockpit and cabin personnel.
3. What is the primary purpose of a cockpit voice recorder (CVR)?
A. Record passenger conversations
, B. Record ATC radar
C. Record cockpit audio for accident investigation
D. Record engine parameters
Answer: C. Record cockpit audio for accident investigation
Explanation: The CVR captures crew communications and cockpit sounds to aid
accident investigators.
4. The emergency locator transmitter (ELT) automatically activates after:
A. Cabin depressurization
B. Hard impact or crash
C. Engine shutdown
D. Landing gear extension
Answer: B. Hard impact or crash
Explanation: Most ELTs activate automatically when they sense significant impact
forces.
5. Which frequency is internationally associated with modern satellite-
monitored ELTs?
A. 121.5 MHz
B. 243 MHz
C. 406 MHz
D. 108 MHz
Explanation: 406 MHz ELTs provide digital distress signals with aircraft
identification.
6. The purpose of the cabin interphone is to:
A. Navigate the aircraft
B. Communicate between crew stations
C. Control cabin lighting
D. Operate weather radar
Answer: B. Communicate between crew stations
, Explanation: Interphone systems provide internal communications throughout the
aircraft.
7. Emergency lighting is powered primarily by:
A. Engine oil pressure
B. Backup batteries
C. Fuel pumps
D. Hydraulic pressure
Answer: B. Backup batteries
Explanation: Emergency lighting remains operational after loss of normal aircraft
electrical power.
8. Floor proximity escape path lighting assists passengers during:
A. Cruise flight
B. Taxi operations
C. Emergency evacuation
D. Aircraft servicing
Answer: C. Emergency evacuation
Explanation: Low-level lighting remains visible even in smoke-filled cabins.
9. Smoke detectors installed in aircraft lavatories primarily protect against:
A. Fuel leaks
B. Unauthorized smoking
C. Cabin pressure loss
D. Hydraulic leaks
Answer: B. Unauthorized smoking
Explanation: Lavatory smoke detectors provide early fire detection.
10.Cargo compartment smoke detectors primarily provide:
A. Fire suppression
B. Fire detection
