FAA Aircraft Dispatcher (ADX)Regulations (Part 121)Hard
A Part 121 certificate holder plans to operate a turbine-powered airplane configured with 34 passenger seats. Under 14 CFR 121.356, this airplane must be equipped with which collision avoidance system?
- ATCAS I only
- BA basic transponder with no resolution advisory capability
- CNo collision avoidance system is required regardless of seating
- DTCAS II with automatic altitude reporting capability
Show answer & explanationAnswer & explanation
Correct answer: D. TCAS II with automatic altitude reporting capability
14 CFR 121.356 requires turbine-powered airplanes with more than 30 passenger seats operated under Part 121 to be equipped with TCAS II, which provides both traffic advisories and resolution advisories along with automatic altitude reporting.
Why the other options are wrong
- A. TCAS I is used in smaller commuter aircraft, not Part 121 airplanes exceeding 30 seats.
- B. A basic transponder alone does not satisfy the collision avoidance requirement.
- C. The 34-seat configuration exceeds the 30-seat threshold, triggering the requirement.
TCAS II Requirement (121.356)
Requires turbine-powered Part 121 airplanes with more than 30 passenger seats to carry TCAS II for collision avoidance.
- Provides both traffic and resolution advisories
- Requires automatic altitude reporting capability
- Smaller commuter aircraft may use TCAS I instead
Memory trick: Thirty-plus seats means Two-CAS (TCAS II) is a must.