Final answer:
Climb gradients in departure procedures outline the necessary climb rate post-takeoff for obstacle clearance. In DVAs, air traffic control vectors aircraft, providing flexibility in climb requirements. Pilots must meet climb standards given by control for safety.
Step-by-step explanation:
In aviation, climb gradients are a crucial aspect of departure procedures(DP). They detail the minimum climb rate required to ensure obstacle clearance after takeoff. Specifically, the 'Trouble T' refers to a note on the DP chart that indicates non-standard takeoff minimums or non-standard obstacle departure procedures are published. Diverse Vector Area (DVA) procedures are designed to provide obstacle protection via vectoring by air traffic control rather than solely by pilot navigation.
For DVAs, published climb gradients in a departure procedure may not apply as strictly as they do for standard departures because air traffic control has more flexibility in vectoring aircraft around obstacles. Instead, pilots are expected to meet or exceed the minimum climb rate required for obstacle clearance as dictated by the vectoring air traffic control provides. It is essential for pilots to understand the departure procedure requirements and ensure their aircraft can comply with any altitude or climb standards that may apply to both standard and DVA departure procedures.