FAA Aircraft Dispatcher (ADX)Regulations (Part 121)Easy
A Part 121 airplane is configured with 150 passenger seats. Under 14 CFR 121.309, what is the minimum number of hand fire extinguishers required to be conveniently located in the passenger compartment?
- ATwo
- BFour
- CThree
- DOne
Show answer & explanationAnswer & explanation
Correct answer: C. Three
14 CFR 121.309(c) establishes a sliding scale: 1 extinguisher for 7-30 seats, 2 for 31-60 seats, 3 for 61-200 seats, and additional extinguishers for larger cabins. With 150 seats, the airplane falls in the 61-200 seat bracket requiring 3 extinguishers.
Why the other options are wrong
- A. Two extinguishers only satisfies the 31-60 seat bracket.
- B. Four extinguishers apply to the 201-300 seat bracket, larger than this aircraft.
- D. One extinguisher only satisfies the 7-30 seat bracket.
Hand Fire Extinguisher Scale (121.309)
Sets minimum number of passenger-compartment hand fire extinguishers based on seating capacity.
- 7-30 seats = 1 extinguisher
- 31-60 seats = 2 extinguishers
- 61-200 seats = 3 extinguishers (increasing further for larger cabins)
Memory trick: Bigger cabin, more red bottles — seat brackets set the extinguisher count.