Which of the following is a typical indicator of a damaged gear door seal?

• A. Fluid leakage into gear well
• B. Gear door color change
• C. Gear well temperature decreases
• D. No noticeable effects

Answer: (A)

A damaged gear door seal allows hydraulic fluid used in the landing gear to escape into the gear well. The seal’s purpose is to contain fluid within the gear bay and keep contaminants out; when it’s damaged, you’ll typically see fluid leaking into the gear well—as dampness, stains, or even a small puddle along the door tracks. This leakage is the most direct and reliable indication of seal failure.

Color change on the gear door isn’t tied to seal integrity and isn’t a dependable sign. A change in gear well temperature isn’t a reliable indicator of a leaking seal, and a result of no noticeable effects would ignore an observable fluid leak, which is the practical symptom you’d look for in maintenance.