An airport has a published Obstacle Departure Procedure (ODP) but no Standard Instrument Departure (SID). A pilot departs IFR in IMC without requesting or briefing the ODP, and ATC issues only a heading and altitude after takeoff. What is true regarding the pilot's obligation to fly the ODP?
- AThe pilot is not required to fly the ODP unless requested, but flying it is strongly recommended for obstacle clearance since ATC vectors may not guarantee terrain separation below the minimum vectoring altitude
- BThe pilot is required by regulation to fly the charted ODP even though ATC issued different instructions
- CThe pilot must fly the ODP only if departing at night
- DODPs are only advisory for turbine-powered aircraft and do not apply to piston airplanes
Show answer & explanationAnswer & explanation
Correct answer: A. The pilot is not required to fly the ODP unless requested, but flying it is strongly recommended for obstacle clearance since ATC vectors may not guarantee terrain separation below the minimum vectoring altitude
An ODP provides obstacle clearance information but is not mandatory unless required by the operator's regulations (e.g., Part 121/135); Part 91 pilots are not required to fly it. However, unless ATC provides radar vectors above the minimum vectoring altitude, following the ODP is the only way to ensure obstacle clearance during the initial climb.
Why the other options are wrong
- B. ODPs are not mandatory for Part 91 operators absent a specific requirement.
- C. ODP recommendation applies regardless of time of day, especially in IMC.
- D. ODPs apply to all aircraft categories, not just turbine-powered ones.
Obstacle Departure Procedure (ODP)
An ODP provides the minimum obstacle clearance route/climb gradient for a departure, published in Part 97, and is not mandatory for Part 91 pilots but is strongly recommended when specific ATC clearance does not otherwise assure obstacle clearance.
- ODPs provide obstacle clearance only, not ATC routing
- Not required for Part 91 operations unless specifically stated
- Provides critical safety margin during initial climb, especially at night or in IMC
Memory trick: 'Obstacles Don't Pardon' mistakes — ODP protects you from terrain, even if optional.