Cruise Clearances: The Block, the Report That Locks It, the Built-In Approach Clearance, and the No-IAP Catch
Updated: 2 days ago
Among the many clearances issued by Air Traffic Control, few cause more confusion than the cruise clearance. Pilots hear the term in training, meet it on the checkride, and then may not hear it again for years — yet when it is issued, misunderstanding it leads to altitude busts, unauthorized climbs, and approach errors. A cruise clearance is powerful and flexible: it hands you a whole block of altitudes and a built-in approach authorization in a single word. But the details carry the weight — it’s the report, not the descent, that gives an altitude back; the block has a floor you still own; and at an airport without an instrument approach, the clearance gets you there but doesn’t get you down through the clouds. Understanding exactly what it authorizes — and what it doesn’t — is essential for IFR pilots.
This post covers cruise clearances in practical depth: the definition and the Glossary text behind it, what the block authorizes, the report that surrenders an altitude (and the strategy that follows from it), the built-in approach authorization and what it means for the missed, the two formal uses (airports with and without an instrument approach), the minimums that still apply, cruise versus maintain, when and why ATC issues one, lost communications, worked scenarios, and the checkride questions.
Study this full length lesson (video, podcast, flashcards, and quiz) here: Full Length Lesson >
What a Cruise Clearance Is
A cruise clearance authorizes you to operate at any altitude from the minimum IFR altitude up to and including the altitude specified in the clearance, climbing and descending within that block at your own discretion — and it’s also approval to proceed to the destination and make an approach there.
A typical cruise clearance:
“N123AB, cruise seven thousand.”
Or combined with routing: “N123AB, cleared direct ABC, cruise six thousand.”
One word — “cruise” — replaces “climb and maintain”
A short clearance with a lot inside it
The Pilot/Controller Glossary definition (closely quoted):
“Used in an ATC clearance to authorize a pilot to conduct flight at any altitude from the minimum IFR altitude up to and including the altitude specified in the clearance. The pilot may level off at any intermediate altitude within this block of airspace. Climb/descent within the block is to be made at the discretion of the pilot. However, once the pilot starts descent and verbally reports leaving an altitude in the block, he/she may not return to that altitude without additional ATC clearance. Further, it is approval for the pilot to proceed to and make an approach at destination airport…”
Every sentence of that definition is a rule
Three ideas: a block, a report that shrinks it, and a built-in approach
Memorize the structure, not just the word
The three things it gives you:
A block of altitudes — from the minimum IFR altitude up to the cruise altitude
Discretion — climb, descend, and level off anywhere in the block without asking
An approach — authorization to proceed to the destination and fly the approach without a separate approach clearance
What a Cruise Clearance Authorizes
The block, in detail.
The altitude block:
The top is the cruise altitude in the clearance (7,000 in “cruise seven thousand”)
The bottom is the minimum IFR altitude for wherever you are — the MEA on an airway, the MOCA where it applies, the OROCA or the 91.177 off-route minimum when off airways
Everything in between is yours
A vertical slice, not a single altitude
Within the block you may:
Level off at any intermediate altitude
Descend at your discretion
Climb at your discretion — as long as you haven’t reported leaving the altitude you want to return to (next section)
Change altitude for weather, ride, icing, or winds without asking
Begin the descent for the destination whenever you choose
It also authorizes you to:
Proceed to the destination airport
Make an approach there (with a published instrument approach, the IAP; without one, a VFR descent and landing — below)
Do so without a further “cleared for the approach” from ATC
Continue through the arrival as a single clearance
Where it’s useful:
Non-radar environments (ATC can’t see you to step you down, so they give you the whole block)
Low-traffic areas and quiet hours
Mountainous terrain where you may want to vary altitude for weather or ride
Remote destinations without approach control
Airports without a published instrument approach (with the VFR caveat)
The Rule That Matters Most: The Report Locks the Altitude
This is the one examiners test — and the one the simple version gets subtly wrong.
The actual rule:
Climb and descent within the block are at your discretion
BUT once you start a descent and verbally report leaving an altitude in the block, you may not return to that altitude without a new ATC clearance
The trigger is the report, not the descent itself
The words “leaving seven thousand” are what give 7,000 away
Why the report is the trigger:
ATC is protecting the entire block for you
When you report leaving an altitude, the controller can release that altitude to other traffic — that’s the whole point of the report
Once released, it may be occupied; you can’t have it back without ATC checking
The report is the handoff of that airspace
The connection to reporting:
AIM 5-3-3 lists reporting when you vacate a previously assigned altitude for a newly assigned one
Under a cruise clearance, the block is what’s assigned — so the AIM doesn’t strictly mandate a report for every intermediate level-off inside it
But the cruise clearance rule is built on the assumption that you report when you leave an altitude: that report is what lets ATC release the altitude, and controllers expect it
Standard practice is to report each descent step (“leaving eight thousand for six thousand”) — and each report surrenders the altitude you left
The practical strategy that follows:
Don’t report leaving an altitude until you’re sure you won’t want it back
If you’re descending to try to get under a layer or out of ice, consider that once you report leaving the higher altitude, it’s gone
Some pilots stay high as long as practical and make the report when the descent to the destination is committed
Know what you’re giving away before you say it
What it looks like:
“Cruise eight thousand.” You’re level at 8,000
You descend to 6,000 for a smoother ride and report, “leaving eight thousand for six thousand”
8,000 is now surrendered — you may fly anywhere from the minimum IFR altitude to 6,000, but not back to 8,000 without a new clearance
If you later want 8,000 again: “Request climb to eight thousand” — and wait for the approval
What the simple version gets wrong:
“Once you descend, you can’t go back up” — not quite; it’s once you REPORT leaving
A descent you haven’t reported hasn’t surrendered anything
But descending without reporting defeats the purpose of the clearance — ATC can’t release the altitude, and the system the clearance depends on breaks down — so report your descents as standard practice
The precise rule: the report is the lock
The one-way ratchet:
Each reported descent step shrinks the top of your block
The block never grows back on its own
It only expands with a new clearance
Manage it like a resource
The Built-In Approach Authorization
What “proceed to and make an approach” actually buys you.
No separate approach clearance needed:
A cruise clearance to an airport with a published instrument approach IS your approach clearance
You don’t need to hear “cleared for the approach” from ATC
You proceed to the IAF (or as the procedure allows), descend within your block, and fly the approach
One clearance covers the whole arrival
Which approach:
You fly a published standard (or special) instrument approach for that airport
The clearance doesn’t name one — you choose a published approach that your equipment and the weather support
Fly it as published (including any required course reversal)
Tell ATC which one if they ask or if coordination is needed
Descending to the approach:
Your block’s floor is the minimum IFR altitude for your position — along the route, that’s the MEA (or applicable minimum); within the approach’s protected airspace, it’s the published approach altitudes
Stay at or above those minimums until the approach procedure lets you descend further
The cruise clearance doesn’t let you go below the IAP’s altitudes
The approach takes over the minimums once you’re on it
The missed approach:
If you go missed, the cruise clearance’s approach authorization is used up
Fly the published missed approach procedure and contact ATC for further clearance (another approach, a hold, the alternate)
You don’t get to fly a second approach on the original clearance
The missed is the point where you need ATC again
Why “one approach” in practice:
The clearance authorizes “an approach” — the one you fly
A second attempt is a new clearance request
In non-radar airspace, ATC needs to know you’re going around to protect the airspace for the missed and any re-attempt
Call them as you execute the missed
The Two Formal Uses: With and Without an Instrument Approach
The Glossary describes two situations, and the second has a catch.
Use 1 — a destination WITH a published instrument approach:
The cruise clearance is your clearance limit at that airport
If you need an instrument letdown, you make it via a standard or special instrument approach for that airport
The approach authorization is the normal case
Straightforward
Use 2 — a destination WITHOUT a published instrument approach:
A cruise clearance can still be issued to an airport that has no IAP (in, below, or outside controlled airspace)
It lets you proceed there, descend, and land
But it is NOT authorization to descend below the minimum IFR altitude in IFR conditions — there’s no approach procedure to protect such a descent
You descend and land under VFR — meaning you must have VMC below the minimum IFR altitude to do it
What Use 2 actually provides:
A way to get an IFR flight plan to a small, approach-less airport
Search-and-rescue protection until you close the flight plan (the IFR flight plan stays open)
No implication that ATC controls you in Class G airspace
Legal structure for a flight that will finish in VMC
The catch, plainly:
“Cruise 5,000” to an airport with no instrument approach, in solid IMC down to 800 feet, does NOT let you let down through the clouds
You’d have to stay at or above the minimum IFR altitude until in VMC — and if you can’t get VMC, you go to an alternate with an approach
The cruise clearance doesn’t manufacture an approach where none exists
Plan the VFR descent before accepting it
Why this is tested:
Pilots hear “cruise clearance authorizes an approach” and assume it authorizes a descent to any airport
The Glossary draws the line explicitly
With an IAP: fly the IAP; without one: VFR descent only
Know which airport you’re going to
Minimum Altitudes Still Apply
The bottom of the block is a real floor.
A cruise clearance does NOT waive:
The MEA on an airway
The MOCA (usable only where it applies — within 22 NM of the VOR by VOR, or anywhere on the segment by GPS)
The MCA at a fix
The OROCA or the 91.177 off-route minimum when off airways
The altitudes on the instrument approach procedure once you’re on it
The minimum IFR altitude in Class G if the route passes through it
“Minimum IFR altitude” is the floor, and it moves:
The floor of your block is whatever minimum applies where you are right now
On an airway with an MEA of 6,000, “cruise 9,000” gives you 6,000 to 9,000 — not the ground to 9,000
As the MEA changes along the route, the floor changes with it (and an MCA may require you to be higher before a fix)
Track the floor as carefully as the top
Cruise means flexibility, not immunity:
Terrain and obstacle clearance are entirely yours within the block
ATC has given you the block on the assumption you’ll respect its floor
A cruise clearance into mountainous terrain is a trust that you know the MEAs
Brief them
Cruise vs. Maintain
The comparison, sharpened.
“Climb and maintain 7,000”:
You fly 7,000 — only 7,000
Any altitude change requires a new clearance (or an emergency)
ATC protects 7,000 and expects you there
The standard clearance in radar environments
“Cruise 7,000”:
You may fly any altitude from the minimum IFR altitude up to and including 7,000
You climb and descend within that block at your discretion
Each altitude you report leaving is surrendered
You’re also cleared to proceed to the destination and make an approach
A block clearance for procedural environments
The key contrasts:
Maintain | Cruise | |
Altitudes available | One | A block (minimum IFR altitude to the cruise altitude) |
Changing altitude | New clearance required | At your discretion within the block |
Giving up altitude | N/A | Each reported descent surrenders that altitude |
Approach authorization | Separate “cleared for the approach” | Built in |
Typical environment | Radar | Non-radar, low traffic |
Why the difference exists:
With radar, ATC can step you down precisely and separate traffic altitude by altitude
Without radar, ATC separates by reserving a whole block for you — a cruise clearance is how they hand you that block
Different separation methods, different clearances
The clearance reflects what ATC can see
When and Why ATC Issues a Cruise Clearance
The controller’s side.
Most commonly issued when:
Radar coverage is limited or unavailable (mountains, low altitude, remote areas, nights at facilities with reduced coverage)
Traffic density is low enough to give one aircraft a whole block
The destination has no approach control (Center is working you all the way to the approach)
Pilot flexibility improves efficiency (weather, ride, terrain)
Reducing ATC workload — one clearance instead of multiple step-downs and an approach clearance
What the controller is doing:
Reserving the entire block for you — no other IFR aircraft will be assigned an altitude in it along your route
Trusting you to manage terrain clearance within it
Expecting your reports as you descend so the released altitudes can be reused
Handing you the arrival without needing to talk to you again until the missed
Where you’ll actually hear it:
Approaching a non-towered destination in Center airspace at night
Remote and mountain airports
Non-radar areas of the country
Rarely in busy terminal airspace
Cruise Clearances and Lost Communications
How the two interact.
The clearance limit:
A cruise clearance’s clearance limit is the destination airport
Under 91.185, with lost comms, you proceed to the clearance limit and begin the approach as close as possible to your ETA (or the expect-further-clearance time, if applicable)
The cruise clearance already authorized the approach, so there’s no ambiguity about whether you may fly it
Proceed and fly the approach
The altitude under lost comms:
91.185 says fly the highest of the altitude assigned in your last clearance, the MEA for the segment, or the altitude ATC told you to expect
Under a cruise clearance, the altitude assigned in your last clearance is the cruise altitude — the top of the block
So the straightforward reading is: fly the highest of the MEA and the cruise altitude, then descend for the approach at the clearance limit
If you had already reported leaving the cruise altitude before losing comms, the regulation doesn’t address whether that surrendered altitude still counts as “assigned”; ATC will be protecting airspace based on your last report, so remaining at or above your current altitude (and the MEA) and proceeding to the approach is the consistent choice — but recognize it’s a gray area, not a published rule
The destination without an approach:
With lost comms to a no-IAP airport, you still can’t descend below the minimum IFR altitude in IMC
If you can’t get VMC, divert to the alternate per 91.185
The cruise clearance didn’t change the physics or the rule
Same caveat, applied without ATC
Why cruise helps lost comms:
The approach authorization is already in hand
No question of “was I cleared for the approach?”
One fewer ambiguity in a bad situation
A quiet advantage
Worked Scenarios
Scenario 1 — the standard case:
“N456CD, cleared direct ABC, cruise six thousand.” The MEA along the direct route is 4,000; ABC has an RNAV approach
You may fly anywhere from 4,000 to 6,000, climbing and descending at will
Approaching ABC, you descend and report “leaving six thousand” — 6,000 is now surrendered
You proceed to the IAF, fly the RNAV approach within its published altitudes, and land
No approach clearance needed; if you go missed, you contact ATC for further clearance
Scenario 2 — the re-climb question:
“Cruise eight thousand.” You’re at 8,000
You descend to 6,000 to get out of light ice and report “leaving eight thousand for six thousand”
At 6,000 the ice is worse
You may NOT climb back to 8,000 on your own — you reported leaving it; request “climb to eight thousand” and wait for approval (declare if you must)
Had you descended to 6,000 WITHOUT reporting, the altitude would not have been formally surrendered — but ATC couldn’t have released it either, and you’d have defeated the purpose of the clearance; report your descents under a cruise clearance as standard practice. The point of the scenario is the mechanism: the report is the lock
Scenario 3 — the no-approach airport:
“Cruise five thousand” to an airport with no instrument approach; the minimum IFR altitude in the area is 3,500; the weather there is 1,200 overcast
You may fly 3,500 to 5,000 and proceed to the airport
You may NOT descend below 3,500 in IMC — there’s no approach to protect it
At 3,500 you’re still in cloud; you cannot legally descend to land — divert to the alternate with an approach
Had the weather been 4,500 scattered with good visibility, you’d descend below 3,500 in VMC and land under VFR, keeping the IFR flight plan open for SAR until you close it
Scenario 4 — managing the block strategically:
“Cruise nine thousand.” MEA 7,000; tops are at 8,500 and it’s smooth on top
You stay at 9,000 on top and make no reports
Approaching the destination, you begin the descent and report leaving 9,000 only when you’re committed to going down
The block stayed intact until you needed to use it
Don’t give altitudes away early
Common Pilot Errors
Treating “cruise” like “maintain” (flying only the top altitude and asking permission to descend — harmless, but shows you don’t understand the clearance)
Climbing back to a previously reported-vacated altitude without a new clearance
Believing the descent itself surrenders the altitude (it’s the report)
Reporting leaving an altitude before you’re sure you won’t want it back
Descending below the MEA, MOCA limits, or an MCA because “cruise means any altitude”
Expecting a separate “cleared for the approach” and holding above the IAF waiting for it
Flying a second approach after a missed without a new clearance
Descending below the minimum IFR altitude in IMC at an airport with no instrument approach
Deviating laterally — a cruise clearance is vertical freedom only; the route is still the route
Descending within the block without reporting it (ATC can’t release the altitude, and the practice the clearance depends on breaks down)
Checkride Questions — With Answers
“What is a cruise clearance?”
A clearance authorizing flight at any altitude from the minimum IFR altitude up to and including the cruise altitude, with climbs and descents within that block at the pilot’s discretion. It also authorizes the pilot to proceed to the destination and make an approach.
“Can you climb back to an altitude you’ve left?”
Not once you’ve verbally reported leaving it — that altitude is surrendered and requires a new ATC clearance. Climb and descent within the block are at your discretion until you report leaving an altitude.
“What’s the floor of the block?”
The minimum IFR altitude for your position — the MEA on an airway, the MOCA where it applies, the MCA at a fix, or the OROCA/91.177 minimum off-route. A cruise clearance never waives minimum altitudes.
“Do you need an approach clearance?”
No. A cruise clearance is approval to proceed to the destination and make a published instrument approach without a separate approach clearance. After a missed approach, you need further clearance from ATC.
“What if the destination has no instrument approach?”
The cruise clearance lets you proceed there and land, but it’s not authorization to descend below the minimum IFR altitude in IFR conditions. You must descend and land under VFR, in VMC, with the IFR flight plan providing SAR protection until you close it. If you can’t get VMC, divert.
“How is cruise different from maintain?”
Maintain assigns one altitude; any change needs a clearance, and the approach is cleared separately. Cruise assigns a block from the minimum IFR altitude to the cruise altitude, changes within it are at your discretion (each reported descent surrenders that altitude), and the approach authorization is built in.
“What’s your altitude under lost comms with a cruise clearance?”
The highest of the MEA and the cruise altitude — the cruise altitude is the altitude assigned in your last clearance — then descend for the approach at the clearance limit, which the cruise clearance already authorized.
Final Thoughts
Cruise clearances give IFR pilots a rare degree of vertical freedom — a whole block of altitudes and a built-in approach in a single word. That freedom comes with precise obligations: the floor of the block is the minimum IFR altitude and it moves with the route; each altitude you report leaving is surrendered and only a new clearance brings it back; the approach authorization covers one approach and ends at the missed; and at an airport without an instrument approach, the clearance delivers you there but the descent through the clouds is not on offer.
If you understand what altitudes are available, exactly when they’re surrendered, and what the approach authorization does and doesn’t cover, a cruise clearance becomes a powerful tool instead of a trap. In IFR flying, flexibility is valuable — but only when paired with precision and discipline.
On the Written Test and Checkride
Cruise clearances appear on instrument writtens and orals. The most commonly tested topics:
The definition (the block from the minimum IFR altitude to the cruise altitude)
The report that surrenders an altitude (not the descent itself)
The built-in approach authorization and the missed-approach limit
The no-instrument-approach airport caveat (VFR descent only)
Minimum altitudes still apply
Cruise vs. maintain
Lost communications under a cruise clearance
Quick Reference
Cruise Clearance (“cruise 7,000”):
A block: from the minimum IFR altitude up to and including the cruise altitude
Climb, descend, and level off anywhere in the block at your discretion
Also authorizes you to proceed to the destination and make an approach
The Floor (moves with the route):
MEA on an airway; MOCA where it applies; MCA at a fix; OROCA / 91.177 minimum off-route; the IAP’s altitudes once on the approach
Never waived by a cruise clearance
The Report Locks the Altitude:
Once you start a descent AND verbally report leaving an altitude, you may not return to it without a new clearance
The REPORT is the trigger, not the descent
Each reported descent shrinks the top of the block (a one-way ratchet)
Report your descents as standard practice — it’s what lets ATC release the altitude
Strategy: don’t report leaving an altitude until you’re sure you won’t want it back
The Built-In Approach:
No separate “cleared for the approach” needed — proceed to the destination and fly a published IAP
Stay within the IAP’s altitudes once on it
After a missed approach: fly the published missed and contact ATC for further clearance (no second approach on the original clearance)
Two Formal Uses:
Destination | What the cruise clearance provides |
Has a published IAP | Proceed, descend within the block, fly the IAP, land |
No IAP | Proceed and land under VFR; NOT authorization to descend below the minimum IFR altitude in IMC; SAR protection until the flight plan is closed |
Cruise vs. Maintain:
Maintain: one altitude; changes need a clearance; approach cleared separately; radar environments
Cruise: a block; changes at your discretion; reported descents surrender altitudes; approach built in; non-radar / low-traffic
When ATC Uses It:
Non-radar coverage, low traffic, remote or mountain destinations, no approach control, night
ATC reserves the whole block for you and trusts you with terrain clearance
Lost Comms:
Clearance limit = the destination; the approach is already authorized
Altitude: highest of the MEA and the cruise altitude (the assigned altitude in your last clearance); if you’d already reported leaving it, the regulation is silent — stay at or above your current altitude and the MEA and proceed to the approach
No-IAP airport: still no descent below the minimum IFR altitude in IMC — divert if no VMC
Common Errors:
Re-climbing to a reported-vacated altitude
Thinking the descent (not the report) surrenders the altitude
Descending below the MEA/MOCA/MCA
Waiting for an approach clearance you already have
Flying a second approach after a missed without clearance
Descending into IMC at a no-IAP airport
Deviating laterally (cruise is vertical freedom only)
Key Principle:
“Cruise” hands you a block — from the minimum IFR altitude to the cruise altitude — with climbs and descents at your discretion and the approach built in. The floor is real and moves with the route. Each altitude you report leaving is surrendered until a new clearance restores it, so don’t report until you mean it. The approach covers one attempt; the missed needs ATC. And at an airport with no instrument approach, the clearance gets you there — but the descent is VFR only.
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Author: Nathan Hodell
CFI, CFII, MEI, ATP, Creator and CEO
Nathan is an aviation enthusiast with thousands of hours of flying and dual instruction over the past 15+ years. Through his aviation career he has been able to earn his ATP, fly as an airline pilot, own/operate flight schools, and create and host wifiCFI.