Placards required on an aircraft are specified in which documents?

• A. FAA Form 337
• B. Airworthiness Certificate
• C. Supplemental Type Certificate
• D. Aircraft Specifications or TCDS

Answer: (D)

Placards on an aircraft are defined by the official limits and operating requirements for that type, which are published in the Aircraft Specifications, also known as the Type Certificate Data Sheet (TCDS). The TCDS is the FAA’s document that accompanies the type certificate and lists what must be installed and what placards must be displayed, along with other operating limitations and equipment details. This makes it the authoritative source for placard requirements because it ties directly to the approved design and permissible operations for that aircraft model.

The other items listed aren’t where placards are specified. A form used for documenting major repairs or alterations doesn’t designate placards. An Airworthiness Certificate is proof that the aircraft meets its approved standards, not a source of placard requirements. A Supplemental Type Certificate covers modifications, but the placard requirements come from the TCDS for the affected aircraft type, and any STC changes would typically reference updated placard needs in the related documentation.