Cessna 172 Type Certificate Data Sheet (TCDS 3A12)

What Is a Type Certificate Data Sheet?

A Type Certificate Data Sheet (TCDS) is an official FAA document that defines the approved airworthiness standards for a specific aircraft type. It is part of the aircraft's type certificate — the FAA's approval of the aircraft design. The TCDS specifies approved engine options, weight limits, CG envelope, airspeed limitations, fuel types, and more for each model variant covered under the certificate.

When a question arises about whether a particular configuration is airworthy — what engine can be installed, what the maximum gross weight is, what fuel types are approved — the TCDS is the authoritative reference.

Engine Options by Model

Weight and CG Limits

• Maximum gross weight: 2,300–2,550 lbs depending on model variant
• CG range: approximately 35–47.3 inches aft of datum (varies by model and fuel/loading configuration)
• Datum: leading edge of the firewall (check specific model for exact datum location)

Airspeed Limitations (Typical)

Note: Exact values vary by model year and serial number. Always reference the specific aircraft's POH for operating limitations.

Why Pilots Reference the TCDS

• Weight & balance calculations — TCDS confirms the datum reference and CG envelope
• Engine/propeller substitution — only engines and propellers listed in the TCDS (or an STC) are approved
• Maintenance decisions — TCDS specifies required inspections and compliance notes
• Oral exam preparation — DPEs may ask where to find gross weight limits; the TCDS and POH are both valid answers