STC ST521SO

Supplemental type certificate · Lockheed Martin Aeronautics Company

Holder
Lockheed Martin Aeronautics Company · United States
Status
Current · Amended
Status date
August 24, 1983
Product
Aircraft · Large Multi-Engine
Certification basis
Part 21
Data sheet
TCDSA1SO

From FAA DRS. DRS record last changed December 6, 2025.

What it approves

Increase in maximum landing weight to 135,000 pounds and maximum zero fuel weight to 128,790 pounds with pylon tanks on and 127,000 pounds with pylon tanks off.

ADs that name this STC · 0

An AD can apply because an STC is installed, or mention one in its text.

No AD in this release names this STC

Approved models · 2

MakeModelData sheet
Lockheed Aircraft Corporation382A1SO
Lockheed Aircraft Corporation382EA1SO