Final answer:
According to most MEL Category C regulations, you are allowed to operate the aircraft for 10 consecutive calendar days. Since the 19th is within that period from the 9th, you should be legally permitted to depart. Always confirm with specific regulations and company procedures.
Step-by-step explanation:
If your TR's (Thrust Reversers) are deferred on the 9th and it is a Category C item on the Minimum Equipment List (MEL), you can refer to the MEL to determine if you can go on the 19th. Typically, MEL Category C items allow for a specific period of time in which the aircraft can be operated without the deferred equipment being operational. For most commercial aircraft, a Category C item usually allows operation for 10 consecutive calendar days. Since you are departing on the 19th, that is within 10 days of the deferral on the 9th, meaning you should be able to operate the flight legally.
However, it is critical to confirm this with the specific regulations that apply to your aircraft and operation, as MELs may vary. Always follow the regulatory requirements, airline procedures, and check with your maintenance department or operations center for the final decision.