En Route IFR Clearances: Efficient Operations Through VFR-to-IFR Transitions 

When ceilings and visibility begin to deteriorate, obtaining an IFR clearance en route—often called a “pop-up IFR clearance”—can be an effective way to increase safety margins and still accomplish the objective. This post outlines key considerations, risk mitigation, and best practices for making the transition from VFR to IFR and provides an excerpt of the relevant FAA policy followed by a sample pilot and ATC radio call. 

Maintaining Obstruction Clearance 
ATC cannot issue an IFR clearance below the Minimum IFR Altitude (MIA) unless you are on a published procedure. If a pilot requests a clearance below the MIA, controllers will typically respond: “Maintain VFR and climb to [MIA].” When conditions preclude a VFR climb, the controller may ask, “Are you able to maintain your own terrain and obstruction clearance to [MIA]?” Not all controllers will offer this solution, so pilots may need to offer it themselves: “I can maintain my own terrain and obstruction clearance in a climb to [MIA].” If the pilot accepts that responsibility, ATC can issue the clearance—but they will not provide specific course guidance below MIA. Obstruction clearance remains the pilot’s responsibility until reaching MIA.  

Acceptance Criteria 
Before providing your own terrain and obstruction clearance, evaluate carefully: 

• Chart Review – Near shore, Coast Guard crews often have the option to climb in IMC over the ocean. Inland, however, crews must study aeronautical charts for terrain and obstacles—towers, ridgelines, or other hazards—and compare them against the planned climb path. 

• Performance – Assess aircraft climb capability. For example, an MH-60T below 8,000’ MSL can typically climb at least 1,000 ft./min. at 60 knots groundspeed, translating to about 1NM of ground track per 1,000 ft. gained. Compare this performance with obstacle clearance requirements. 

• Escape Alternatives – Always stay ahead of the aircraft. Request the IFR clearance while options still exist. If you wait until you are already in IMC and near terrain and obstacles, the transition becomes a reactive emergency rather than a deliberate choice. 

• Course Reversal – If performance, terrain, or weather raise doubts, the best option may be to turn back toward an area with higher ceilings and visibility and/or less terrain and obstacles for your IFR climb. 

Risk Mitigation 
Continuing VFR into marginal or deteriorating weather is one of aviation’s most dangerous traps, and a leading cause of controlled flight into terrain (CFIT) accidents. Knowing how to obtain an IFR clearance en route—and understanding when and how to accept terrain clearance responsibility—is a key element of professional airmanship.  In my view, Coast Guard rotary-wing crews (and helicopter pilots in general) often assume more risk than necessary in low ceilings and visibility. Instead of pushing forward into long transits in those conditions, moving the aircraft to a location that permits an IMC climb to MIA so that an IFR clearance can be obtained often results in a more efficient mission with wider safety margins.  

Premeditated IFR: A Better Contingency 
Over time, I realized the benefit of filing an IFR flight plan prior to missions in which a transition from VFR to IFR may be warranted. Having the plan on file allowed the crew to complete altitude, routing, performance checks, NOTAM reviews, and weather analysis ahead of IFR flight—rather than amid a transition to IFR with limited resources and competing demands. Also, by reducing controller workload during the transition, it made the clearance process smoother and more efficient. Even though picking up a pop-up IFR clearance en route is an excellent in-flight adjustment, preparing and filing for IFR clearance ahead of time is more advantageous. 

FAA Policy  

FAA Order JO 7110.65BB – Air Traffic Control 
This order prescribes air traffic control procedures and phraseology for use by personnel providing air traffic control services. Controllers are required to be familiar with the provisions of this order that pertain to their operational responsibilities and to exercise their best judgment if they encounter situations not covered by it. 

SECTION 4-2-8 IFR-VFR AND VFR-IFR FLIGHTS 
C. When an aircraft changes from VFR to IFR, the controller must assign a beacon code to Mode‐C equipped aircraft that will allow MSAW alarms (Minimum Safe Altitude Warning and Conflict Alert).

D. When VFR aircraft operating below the minimum altitude for IFR operations requests an IFR clearance and the pilot informs you, or you are aware, that they are unable to climb in VFR conditions to the minimum IFR altitude: 

1. Before issuing a clearance, ask if the pilot is able to maintain terrain and obstruction clearance during a climb to the minimum IFR altitude. 

PHRASEOLOGY
(Aircraft call sign), ARE YOU ABLE TO MAINTAIN YOUR OWN TERRAIN AND OBSTRUCTION CLEARANCE UNTIL REACHING (appropriate MVA/MIA/MEA/OROCA) 

NOTE
Pilots of pop-up aircraft are responsible for terrain and obstacle clearance until reaching minimum instrument altitude (MIA) or minimum en route altitude (MEA). Pilot compliance with an approved FAA procedure or an ATC instruction transfers that responsibility to the FAA; therefore, do not assign (or imply) specific course guidance that will (or could) be in effect below the MIA or MEA. 

EXAMPLE
“November Eight Seven Six, are you able to provide your own terrain and obstruction clearance between your present altitude and six thousand feet?” 

2. If the pilot is able to maintain their own terrain and obstruction clearance, issue the appropriate IFR clearance as prescribed in paragraph 4-2-1, Clearance Items, and paragraph 4-5-6, Minimum En Route Altitudes. 

3. If the pilot states that they are unable to maintain terrain and obstruction clearance, instruct the pilot to maintain VFR and to state intentions. 

4. If appropriate, apply the provisions of paragraph 10-2-7, VFR Aircraft In Weather Difficulty, or paragraph 10-2-9, Radar Assistance Techniques, as necessary. 

Example Pilot and ATC communication 
Pilot: [Call Sign] [Aircraft type] [Altitude] [Location] Requesting a pop-up clearance (or IFR clearance if you have one on file) to [Destination]. 
ATC: [Call Sign] Squawk [Code] and IDENT 
Pilot: Squawk [Code] [Call Sign]. 
ATC: [Call Sign] You are radar contact [miles from the airport]. Maintain VFR and climb to [MIA]. 
Pilot: Unable [Call Sign]. – to expedite, a pilot could offer up their ability to maintain terrain and obstacle clearance with the “unable” call. If the pilot does not… 
ATC: [Call Sign] Are you able to provide your own terrain and obstruction clearance between your present altitude and [MIA]?  
Pilot: Affirmative [Call Sign]. 
ATC: [Call Sign] You are cleared to the [Destination airport], maintain your own terrain and obstruction clearance to [MIA], upon reaching [MIA] fly heading [Vector] (or cleared direct [Fixes].