Fire Protection, Fuel & APU Systems Exam | Aviation
Maintenance Practice Test & Study Guide 2025
1. How many fire protection channels (PFPS) are there?
A. 1
B. 2
C. 3
D. 4
Answer: B
Rationale: There are 2 fire protection channels, designated a and b.
2. How many copies of the PFPS software are there, and where are they located?
A. 1 copy in the Left CCR
B. 2 copies, 1 in each CCR
C. 3 copies, 2 in Left CCR and 1 in Right CCR
D. 1 copy in the Flight Deck
Answer: B
Rationale: There are 2 copies of the PFPS software, with one located in each Central Control
Rack (CCR).
3. How many fire detector assemblies are there per engine?
A. 3
B. 6
C. 9
,D. 12
Answer: B
Rationale: Each engine is equipped with 6 fire detector assemblies.
4. What controls the indications for the engine fire and cut-off switches?
A. The DCAF directly
B. The RDC's
C. The PFPS software
D. The CMCF
Answer: C
Rationale: The Powerplant Fire Protection System (PFPS) software controls these indications.
5. What system turns on the master warning for a fire?
A. PFPS
B. DCAF
C. RDC
D. CMCF
Answer: B
Rationale: The Data Concentrator and Firewall (DCAF) unit turns on the master warning.
6. What type of logic is usually used for the fire detection loops?
A. OR Logic
B. NOT Logic
C. AND Logic
D. NAND Logic
Answer: C
,Rationale: AND logic is typically used, requiring confirmation from more than one sensor to
prevent false alarms.
7. What does the Duct Leak Overheat Detection System (DLODS) detect?
A. APU Bay overheat
B. Engine Bay overheat
C. Nose cowl EAI (Engine Anti-Ice) overheat
D. Cargo Bay overheat
Answer: C
Rationale: The DLODS specifically detects overheat conditions in the nose cowl Engine Anti-
Ice (EAI) system.
8. How are the engine fire extinguisher squibs monitored?
A. Directly by the PFPS
B. By the DCAF
C. By the RDC's (Remote Data Concentrators)
D. By the CMCF
Answer: C
Rationale: The RDC's monitor the status of the engine squibs.
9. Where are the engine fire extinguisher bottles located?
A. Aft cargo, left side
B. Forward cargo, right side
C. Wheel well
D. Wing root
Answer: B
, Rationale: The engine extinguisher bottles are located on the right side of the forward cargo
compartment.
10. How many fire detectors are in the engine system?
A. 2
B. 3
C. 6
D. 9
Answer: B
Rationale: There are 3 fire detectors monitored for the engine system.
11. When will the engine extinguisher automatically operate?
A. Immediately upon detection
B. 5 seconds after detection
C. 15 seconds after detection
D. 60 seconds after detection
Answer: C
Rationale: The extinguisher will automatically operate 15 seconds after fire detection in both
attended and unattended modes.
12. In flight (attended mode), what logic mode does the APU fire detection system operate
in?
A. OR Logic
B. AND Logic
C. Sequential Logic
D. Single Loop Logic
Maintenance Practice Test & Study Guide 2025
1. How many fire protection channels (PFPS) are there?
A. 1
B. 2
C. 3
D. 4
Answer: B
Rationale: There are 2 fire protection channels, designated a and b.
2. How many copies of the PFPS software are there, and where are they located?
A. 1 copy in the Left CCR
B. 2 copies, 1 in each CCR
C. 3 copies, 2 in Left CCR and 1 in Right CCR
D. 1 copy in the Flight Deck
Answer: B
Rationale: There are 2 copies of the PFPS software, with one located in each Central Control
Rack (CCR).
3. How many fire detector assemblies are there per engine?
A. 3
B. 6
C. 9
,D. 12
Answer: B
Rationale: Each engine is equipped with 6 fire detector assemblies.
4. What controls the indications for the engine fire and cut-off switches?
A. The DCAF directly
B. The RDC's
C. The PFPS software
D. The CMCF
Answer: C
Rationale: The Powerplant Fire Protection System (PFPS) software controls these indications.
5. What system turns on the master warning for a fire?
A. PFPS
B. DCAF
C. RDC
D. CMCF
Answer: B
Rationale: The Data Concentrator and Firewall (DCAF) unit turns on the master warning.
6. What type of logic is usually used for the fire detection loops?
A. OR Logic
B. NOT Logic
C. AND Logic
D. NAND Logic
Answer: C
,Rationale: AND logic is typically used, requiring confirmation from more than one sensor to
prevent false alarms.
7. What does the Duct Leak Overheat Detection System (DLODS) detect?
A. APU Bay overheat
B. Engine Bay overheat
C. Nose cowl EAI (Engine Anti-Ice) overheat
D. Cargo Bay overheat
Answer: C
Rationale: The DLODS specifically detects overheat conditions in the nose cowl Engine Anti-
Ice (EAI) system.
8. How are the engine fire extinguisher squibs monitored?
A. Directly by the PFPS
B. By the DCAF
C. By the RDC's (Remote Data Concentrators)
D. By the CMCF
Answer: C
Rationale: The RDC's monitor the status of the engine squibs.
9. Where are the engine fire extinguisher bottles located?
A. Aft cargo, left side
B. Forward cargo, right side
C. Wheel well
D. Wing root
Answer: B
, Rationale: The engine extinguisher bottles are located on the right side of the forward cargo
compartment.
10. How many fire detectors are in the engine system?
A. 2
B. 3
C. 6
D. 9
Answer: B
Rationale: There are 3 fire detectors monitored for the engine system.
11. When will the engine extinguisher automatically operate?
A. Immediately upon detection
B. 5 seconds after detection
C. 15 seconds after detection
D. 60 seconds after detection
Answer: C
Rationale: The extinguisher will automatically operate 15 seconds after fire detection in both
attended and unattended modes.
12. In flight (attended mode), what logic mode does the APU fire detection system operate
in?
A. OR Logic
B. AND Logic
C. Sequential Logic
D. Single Loop Logic
