Definition
An Obstacle Departure Procedure is a published instrument departure procedure that provides a pilot with a specific route or set of climb requirements designed to keep the aircraft clear of terrain and obstacles after takeoff. ODPs are developed when the standard climb gradient (200 feet per nautical mile) is not sufficient to ensure obstacle clearance from a particular runway. They are printed in textual form, and sometimes graphical form, in the front of the FAA Terminal Procedures Publication (TPP) for the airport, and they are intended primarily for obstacle avoidance rather than for traffic separation.
Plain English
A set of takeoff instructions, published for a specific airport and runway, that tells you how to climb out safely when there are mountains, towers, or other obstacles in the way. You follow the route or meet the climb rate it specifies, and you will stay clear of everything you can't see.
Context Anchor
You encounter ODPs when planning an instrument departure from an airport, especially before takeoff in low visibility or at airports near rising terrain, towers, or other obstacles.
Derivation
The phrase is plain English, but the key idea is in the word 'procedure' — a defined sequence of actions. An ODP is a procedure built specifically to handle the obstacle problem, separately from any procedure built to handle traffic flow.
Why Pilots Care
Using the published ODP guarantees the required obstacle clearance during the initial climb, reducing the risk of controlled flight into terrain.
Grounding Statement
An ODP is the safe escape path from the airport when a normal climb-out might not clear what is nearby.
Intuition Check
Do not assume an ODP is just extra paperwork or only an air traffic control instruction. Its main purpose is obstacle clearance, and the pilot may need to use it even if air traffic control does not mention it.
Example Sentence 1
Before departing the mountain airport in low visibility, the pilot reviewed the ODP and confirmed the aircraft could meet the required 350 feet per nautical mile climb gradient.
Example Sentence 2
When no ODP was available, the pilot climbed straight ahead until reaching 400 feet above the airport elevation before turning.