VFR to IFR Clearance

AIM ¶ 4-4-9 — VFR to IFR Clearance

AIM 4-4-9 explains pilot responsibility for terrain clearance when picking up an IFR clearance en route below MEA/MIA/MVA/OROCA. Study guide for checkride prep.

In Plain English

When you depart VFR and plan to (or need to) pick up an IFR clearance en route, you must stay aware of your aircraft's position relative to terrain and obstructions. ATC may issue a clearance at an altitude below the published minimums — and when that happens, you are responsible for your own terrain and obstruction clearance until you climb to the:

MEA — Minimum En Route Altitude
MIA — Minimum IFR Altitude
MVA — Minimum Vectoring Altitude
OROCA — Off-Route Obstruction Clearance Altitude

If you can't maintain safe clearance from terrain or obstacles at the assigned altitude, tell the controller and state your intentions (e.g., request a higher altitude or a different routing).

About OROCA: It provides 1,000 ft of terrain/obstruction clearance (2,000 ft in designated mountainous areas). However, OROCA is not evaluated for NAVAID signal coverage, ATC radar surveillance, or communications coverage. It's published for situational awareness, flight planning, and in-flight contingencies — not as a guaranteed IFR routing altitude.

This matters operationally because picking up IFR in the air, especially in marginal VFR or near rising terrain, can place you in IMC below safe altitudes if you're not actively monitoring your position.

AIM Source Text

FAA AIM ¶ 4-4-9

4-4-9. 4-4-9. VFR/IFR Flights A pilot departing VFR, either intending to or needing to obtain an IFR clearance en route, must be aware of the position of the aircraft and the relative terrain/obstructions. When accepting a clearance below the MEA/MIA/MVA/OROCA, pilots are responsible for their own terrain/obstruction clearance until reaching the MEA/MIA/MVA/OROCA. If pilots are unable to maintain terrain/obstruction clearance, the controller should be advised and pilots should state their intentions. NOTE- OROCA is a published altitude which provides 1,000 feet of terrain and obstruction clearance in the US (2,000 feet of clearance in designated mountainous areas). These altitudes are not assessed for NAVAID signal coverage, air traffic control surveillance, or communications coverage, and are published for general situational awareness, flight planning and in-flight contingency use.

Oral Exam Questions a DPE Might Ask

Q1If you depart VFR and accept an IFR clearance en route at an altitude below the MEA, who is responsible for terrain and obstruction clearance?

Per AIM 4-4-9, the pilot is responsible for their own terrain and obstruction clearance until reaching the MEA, MIA, MVA, or OROCA.

Q2What should you do if you cannot maintain terrain or obstruction clearance at an assigned altitude?

Per AIM 4-4-9, you should advise the controller that you are unable to maintain terrain/obstruction clearance and state your intentions.

Q3What is OROCA and what does it guarantee?

Per AIM 4-4-9, OROCA is the Off-Route Obstruction Clearance Altitude. It provides 1,000 ft of terrain/obstruction clearance (2,000 ft in designated mountainous areas), but is not assessed for NAVAID signal coverage, ATC surveillance, or communications. It is published for situational awareness, flight planning, and in-flight contingency use only.

Related Paragraphs in AIM Chapter 4

¶ 4-4-1

ATC Clearance

¶ 4-4-10

Adherence to ATC Clearance

¶ 4-4-11

IFR Separation Standards

¶ 4-4-12

ATC Speed Adjustments

¶ 4-4-13

Runway Separation

¶ 4-4-14