From FAA DRS. DRS record last changed December 6, 2025.
What it approves
Modify -59A LPT case to reduce the thickness of four bosses to eliminate interference with the turbine case cooling manifold installed on -7Q engines. This modification permits use of the -59A LPT case on-7Q engines.
ADs that name this STC · 0
An AD can apply because an STC is installed, or mention one in its text.