Dangerous goods must not be carried in passenger aircraft unless allowed by the provisions in 2.3.2 to 2.3.5 and 2.5.1

• A. 2.3.2 to 2.3.5 and 2.5.1
• B. 3.0 to 3.4 and 4.0
• C. 1.2.1 and 1.2.2
• D. 5.1 to 5.4 and 6.1

Answer: (A)

Dangerous goods on passenger aircraft are tightly controlled because the cabin and crew are exposed to higher risk. The only time such goods may be carried is when the shipment meets the specific allowances established for passenger operations. Those provisions spell out exactly what can be carried, how it must be packed and labeled, what documentation is required, and what training and responsibilities the shipper and operator have, including any quantity, packaging, and segregation limits. When a dangerous good satisfies all of these conditions, carriage on a passenger flight is permitted; if not, it must not be carried.

Other parts of the regulations cover different topics, such as general classification, packaging, or rules for cargo aircraft, and do not authorize carriage on passenger aircraft, so they aren’t the relevant reference for allowances in this context.