Do Part 107 drone pilots need a radio to fly in controlled airspace?

Part 107 remote pilots are not required to establish two-way radio communication with ATC to enter controlled airspace. Instead, they must obtain prior airspace authorization through the FAA's Low Altitude Authorization and Notification Capability (LAANC) system or by submitting a request through DroneZone before the operation. This is a fundamental difference from manned aircraft operations, where two-way radio contact is the standard entry requirement under 14 CFR Part 91.

What is LAANC and how does it work for Part 107 operations in controlled airspace?

LAANC, the Low Altitude Authorization and Notification Capability, is an automated FAA system that allows Part 107 remote pilots to request and receive near-real-time airspace authorization to fly in certain controlled airspace at or below established altitude ceilings. The system works through FAA-approved UAS Service Suppliers whose apps interface directly with FAA data to grant or deny requests based on pre-approved altitude grids. Pilots flying outside LAANC-supported areas or above grid altitudes must apply for authorization through the FAA DroneZone portal, which can take additional processing time.

What's the difference between airspace authorization and airspace waiver for Part 107 drone pilots?

An airspace authorization permits a remote pilot to fly in controlled airspace under standard Part 107 operating rules, typically at or below the altitudes defined in LAANC grids or as approved through DroneZone. An airspace waiver, by contrast, allows a remote pilot to deviate from a specific provision of Part 107 rules — such as flying at night or over people — and requires a separate application with a detailed safety case submitted to the FAA. Understanding this distinction is important for the FAA Part 107 Aeronautical Knowledge Test, as the two approval types serve different regulatory purposes under 14 CFR Part 107.

Controlled Airspace Communication Requirements for Part 107 Operations

When a manned aircraft pilot wants to enter Class B, C, or D airspace, they pick up the radio, call the appropriate facility, and receive a clearance or acknowledgment before proceeding. For a Part 107 remote pilot commanding a small unmanned aircraft system (sUAS), the pathway looks different — but the underlying purpose is identical: ensuring that air traffic control (ATC) knows who is operating in controlled airspace, where they are, and what they intend to do. Understanding how communication requirements apply (and sometimes do not apply) to Part 107 operations is one of the most tested and most misunderstood topic areas on the FAA Unmanned Aircraft General knowledge exam.

This article walks through each class of controlled airspace, explains exactly what Part 107 requires in each, describes the authorization systems available, and clarifies the handful of edge cases that trip up even well-prepared candidates.

Why Airspace Communication Rules Exist

The National Airspace System (NAS) was designed primarily around manned aircraft equipped with radios, transponders, and pilots who can see and be seen. A small drone operating below 400 feet AGL is nearly invisible to radar at typical altitudes and completely silent on the radio. ATC cannot sequence or separate an sUAS the way it separates a Cessna from a Boeing. The solution Congress and the FAA chose under 14 CFR Part 107 is prior authorization rather than real-time radio communication. By requiring operators to obtain approval before entering controlled airspace, the FAA gives ATC advance awareness of drone activity without demanding that every remote pilot carry and operate a radio.

That said, a remote pilot who does have radio capability and chooses to monitor ATC frequencies adds an important layer of situational awareness. Nothing in Part 107 prohibits monitoring a frequency — and during complex or high-risk operations many professional remote pilots do exactly that.

The Authorization Requirement: The Core Rule

Under 14 CFR §107.41, a remote pilot in command (RPIC) may not operate an sUAS in Class B, Class C, Class D, or the surface area of Class E airspace without prior authorization from the appropriate ATC facility or through an FAA-approved system. This is the single most important sentence in this topic area. Notice what it says and what it does not say:

It applies to Class B, C, and D airspace and to the surface area of Class E — not to Class E airspace in general (Class E airspace that starts at 700 feet AGL or 1,200 feet AGL does not require authorization for sUAS operations conducted below those ceilings).
It requires prior authorization — you must have approval before you launch, not after you are already airborne.
Authorization is obtained from ATC or through an FAA-approved mechanism — most commonly the Low Altitude Authorization and Notification Capability (LAANC) system or the FAA DroneZone portal.
Real-time two-way radio communication with ATC is not the mechanism Part 107 uses — authorization replaces the radio call that a manned pilot would make.

How LAANC Works

The Low Altitude Authorization and Notification Capability (LAANC) is an automated data exchange system between the FAA and approved UAS Service Suppliers (USS). It allows remote pilots to apply for and receive near-real-time airspace authorization for operations at or below FAA-published altitude ceilings in designated grid squares around airports. When you use a LAANC-enabled app, the system checks your requested location and altitude against the FAA's UAS Facility Map (UASFM) ceiling for that grid. If your requested altitude is at or below the published ceiling, authorization is typically granted within seconds.

Key points about LAANC for the knowledge test:

LAANC authorizations are tied to a specific location, altitude, and time window. Changing any of those parameters requires a new or amended authorization.
LAANC covers most (but not all) controlled airports. At airports without LAANC coverage, operators must apply through the FAA DroneZone portal, which involves manual ATC review and can take days or weeks.
A LAANC authorization does not remove other Part 107 requirements — the pilot still must maintain visual line of sight (VLOS), yield right-of-way to manned aircraft, stay below 400 feet AGL (or within 400 feet of a structure), and comply with all other applicable rules.
The UAS Facility Map ceiling for a given grid square can be as low as 0 feet — meaning no automatic LAANC approval is possible and a manual DroneZone waiver is required even to hover at ground level in that area.

Class B Airspace

Class B airspace surrounds the nation's busiest commercial airports and extends outward and upward in a layered, upside-down wedding cake configuration. For manned aircraft, entry requires an ATC clearance and a functioning two-way radio. For Part 107 sUAS operations, authorization under §107.41 is required. Because Class B surface areas are among the most complex and congested airspace environments in the NAS, UAS Facility Map ceilings in Class B surface areas are frequently set at 0 feet, requiring operators to apply for manual authorization through DroneZone. Approvals, if granted at all, typically include specific altitude, location, and time restrictions.

Class C Airspace

Class C airspace typically surrounds airports with a radar approach control facility and a significant level of IFR traffic. Its standard dimensions are a 5 nautical mile (NM) radius inner core surface area from the surface up to 4,000 feet AGL and a 10 NM radius outer area, with a shelf beginning at 1,200 feet AGL and extending up to 4,000 feet AGL (dimensions can vary by facility). Manned pilots entering Class C must establish two-way radio contact with approach control. Part 107 remote pilots must have prior authorization under §107.41. LAANC coverage exists at most Class C airports, though facility map ceilings in the inner circle are often 0–50 feet near the runways.

Class D Airspace

Class D airspace is the most common type of controlled airspace a Part 107 operator is likely to encounter — it surrounds towered airports that do not have the traffic levels warranting Class B or C. Class D typically extends from the surface up to 2,500 feet AGL and has a roughly 4–5 NM radius. Manned pilots must establish two-way radio communication with the tower before entering. Part 107 operators again use prior authorization (LAANC or DroneZone). One nuance: Class D airspace only exists when the control tower is operational. When the tower closes, Class D reverts to Class E or Class G airspace depending on the published procedures, potentially eliminating the authorization requirement for low-altitude sUAS operations — but operators must verify this with current NOTAMs and charts.

Class E Surface Areas

Class E surface area (depicted on sectional charts with a dashed magenta line) exists around airports that have instrument approaches but no operating control tower, or around some airports during specific hours. This airspace extends from the surface upward. Under §107.41, operating an sUAS within a Class E surface area requires prior authorization, just like Class B, C, and D. This surprises many students who assume Class E is uncontrolled — in fact, all Class E airspace is controlled airspace regardless of where its floor begins. The distinction that matters for Part 107 purposes is not controlled versus uncontrolled, but where the Class E floor sits: a Class E surface area requires prior authorization under §107.41, while Class E beginning at 700 feet or 1,200 feet AGL does not require authorization for sUAS operations conducted below that floor.

Class G Airspace and the No-Authorization Zone

Class G (uncontrolled) airspace requires no ATC authorization for Part 107 operations. This is typically found in rural areas away from airports, below 700 feet AGL (or 1,200 feet AGL in some areas). Remote pilots can operate freely in Class G as long as they comply with all other Part 107 limitations. Because most recreational drone flying happens in Class G, new pilots sometimes incorrectly assume no airspace authorization is ever needed — this assumption becomes dangerous near airports.

Key Numbers and Rules

14 CFR §107.41 — the authorization requirement for controlled airspace sUAS operations.
Class B, C, D, and E surface areas — all require prior authorization; Class E above 700 or 1,200 feet AGL does not.
400 feet AGL — the standard altitude ceiling for Part 107 operations; authorization does not override this limit unless a waiver is also obtained under §107.51.
LAANC — near-real-time authorization; compare requested altitude to UAS Facility Map ceiling.
FAA DroneZone — manual authorization pathway for airports without LAANC or for operations exceeding LAANC ceilings.
0-foot ceiling grids — common near runways; require manual waiver even for ground-level operations.
Class D exists only while the tower is operational — check NOTAMs for part-time towers.

Common Test Traps

Confusing authorization with radio calls. The FAA knowledge test may present a scenario where an answer choice says the remote pilot must contact the tower by radio before flying. Under Part 107, prior written/electronic authorization (not a radio call) is the correct mechanism.
Assuming all Class E requires authorization. Only Class E surface areas require authorization. Class E beginning at 700 or 1,200 feet AGL does not, and most Part 107 operations at low altitude in those areas are legal without approval.
Thinking authorization means unlimited access. A LAANC or DroneZone authorization still comes with specific conditions — altitude ceilings, geographic boundaries, time limits. Exceeding any of these conditions violates §107.41 just as flying without authorization would.
Forgetting that Class D is part-time. When a tower closes, Class D reverts, potentially removing the authorization requirement — but also removing ATC services, which can affect situational awareness and safety.
Overlooking the UAS Facility Map ceiling of zero. Students sometimes assume LAANC will always provide a path to authorization. A 0-foot ceiling means LAANC cannot help; only a manual DroneZone application, with potential ATC denial, stands between the operator and an illegal flight.