What information must be on a NOTOC for a flight carrying dangerous goods?

The NOTOC must include the proper shipping name, hazard class and division, UN/ID number, quantity and number of packages, the specific location (cargo compartment) where the material is stowed, and any special handling or emergency response information. This allows the PIC and emergency responders to identify and react appropriately to any hazmat incident involving that shipment.

When does the dispatcher have to give the NOTOC to the pilot?

The NOTOC must be provided to the Pilot in Command before the aircraft departs—in practice, before engine start or pushback. If dangerous goods are added or removed from the flight after the original NOTOC is issued, the dispatcher must update the document and provide the revised version to the PIC before departure. The PIC must acknowledge receipt.

What happens if undeclared dangerous goods are found on an aircraft after it has already taken off?

Under 49 CFR 175.31, the Pilot in Command is required to notify the appropriate air traffic control facility and the destination airport authority as soon as undeclared or misdeclared dangerous goods are discovered in flight. The dispatcher should simultaneously coordinate emergency response resources at the destination and provide the PIC with any information that can support safe handling of the situation.

Dangerous Goods Notification to the Pilot in Command (NOTOC)

Every time an air carrier aircraft departs with hazardous materials—called dangerous goods in international terminology—the Pilot in Command (PIC) must receive a written notification before the flight departs. This document is universally known as the NOTOC, or Notification to the Pilot in Command. Without it, the crew has no way of knowing what special hazards may be lurking in the cargo hold, which can have life-or-death consequences in an emergency. For the aircraft dispatcher, generating, verifying, and transmitting the NOTOC is a critical legal and safety responsibility that sits at the intersection of hazmat regulations, crew resource management, and emergency response planning.

Understanding the NOTOC means understanding the broader regulatory framework that governs air transportation of dangerous goods. In the United States, that framework is primarily found in 49 CFR Part 175 (Carriage by Aircraft), which implements the international standards set by ICAO's Technical Instructions, and in 14 CFR 121.557, which imposes specific duties on air carriers operating under Part 121. Together these rules define who must produce the NOTOC, what it must contain, when it must be delivered, and what happens when dangerous goods are discovered after departure.

What the NOTOC Is and Who Produces It

The NOTOC is a written or electronic document prepared by the air carrier—typically by ground operations, load planning, or the dispatcher—and provided to the PIC before engine start or, at the latest, before the aircraft pushes back from the gate. Its purpose is simple: to give the flight crew an accurate, current picture of every piece of dangerous goods aboard the aircraft so they can make informed decisions if anything goes wrong.

The NOTOC is distinct from the shipper's declaration (the paperwork the shipper prepares to certify their goods). The shipper's declaration is the legal tender between the shipper and the carrier; the NOTOC is the carrier's internal communication to its own flight crew. The dispatcher or load coordinator consolidates all accepted dangerous goods shipments for a given flight into one cohesive NOTOC document.

Required Content of the NOTOC

49 CFR 175.33 specifies that the operator must provide the PIC with written information about each hazardous material shipment on board. While the regulation allows some flexibility in format, the information required includes:

Proper shipping name — the standardized name for the material as listed in the Hazardous Materials Table (49 CFR 172.101).
Hazard class and division — the primary hazard category (e.g., Class 3 Flammable Liquid, Class 8 Corrosive) and any subsidiary hazard.
UN/ID number — the four-digit identification number assigned to the material (e.g., UN 1203 for gasoline).
Quantity and number of packages — how many packages and the total net quantity of the hazardous material.
Location on the aircraft — the specific cargo compartment or position where the shipment is stowed, so the crew knows exactly where the hazard is located.
Special handling information — any relevant emergency response guidance, such as whether the material must remain upright, is incompatible with other materials, or requires special ventilation.
Shipper's certification reference — confirmation that the shipment was accepted in accordance with regulations.

Many carriers supplement the basic required content with the Emergency Response Guide (ERG) code or the 24-hour emergency contact number (CHEMTREC or equivalent), giving the flight crew immediate access to emergency response information if they need to land and coordinate with first responders.

When the NOTOC Must Be Delivered

Timing is critical. Under 49 CFR 175.33, the operator must provide the NOTOC to the PIC before the aircraft departs. In practical terms, this means the NOTOC should be in the PIC's hands before the final load is secured and before engine start. The dispatcher plays a crucial bridging role here: any last-minute additions to the cargo manifest that include dangerous goods require an immediate update to the NOTOC and re-delivery to the PIC.

The PIC is required to acknowledge receipt of the NOTOC. This acknowledgment is not merely a formality—it confirms that the crew is aware of the hazards before assuming command of the aircraft. Many carriers use an electronic system in which the PIC's acknowledgment is logged with a timestamp, creating a verifiable record.

The Dispatcher's Role Under 14 CFR 121.557

14 CFR 121.557 addresses the authority of the dispatcher and the PIC in emergencies and in the overall operational control of the flight. It reinforces that the dispatcher shares responsibility with the PIC for the safe conduct of each flight. When it comes to the NOTOC, this shared responsibility means the dispatcher is not simply a clerk filling out a form. The dispatcher must:

Verify that all dangerous goods manifested on the flight have been properly accepted and documented before issuing the NOTOC.
Ensure that incompatible materials are not co-loaded in the same compartment (e.g., oxidizers and flammables must be segregated per 49 CFR 175.75).
Confirm that quantity limitations applicable to the aircraft type and passenger/cargo configuration are not exceeded.
Communicate any unusual or high-consequence dangerous goods—such as radioactive materials or infectious substances—to the PIC with particular emphasis.
Update the NOTOC and re-notify the PIC if any hazmat is added or removed after the original document was issued.

The dispatcher's signature on the NOTOC (or the electronic equivalent) is a professional attestation that these checks have been performed. Failure to provide a required NOTOC, or providing one with incorrect information, is a violation of federal hazmat law and subjects the carrier—and potentially individual employees—to civil penalties under 49 U.S.C. 5123 and criminal penalties under 49 U.S.C. 5124.

What Happens When Dangerous Goods Are Discovered En Route

Even with the best pre-departure procedures, undeclared or misdeclared dangerous goods are sometimes discovered after the aircraft departs. 49 CFR 175.31 requires the PIC to notify the appropriate air traffic control facility and the destination airport authority whenever dangerous goods that were not properly declared are found on board. The dispatcher must be kept in the loop through normal operational control communications so that emergency resources can be pre-positioned at the destination.

14 CFR 121.557 also empowers the PIC to deviate from any rule to the extent necessary to meet an emergency involving dangerous goods. The dispatcher's responsibility in this scenario is to support the PIC's decisions—providing weather alternates, coordinating emergency notifications, and liaising with emergency response teams—not to override the PIC's in-flight judgment.

Why the NOTOC Matters for Emergency Response

Consider a scenario: an aircraft lands with a cargo compartment fire warning. Fire crews arrive within seconds. Without the NOTOC, those crews have no idea whether they are dealing with a compartment that contains flammable liquids, compressed gases, radioactive material, or infectious substances—each of which requires an entirely different suppression and exposure strategy. With the NOTOC, crews can pull the Emergency Response Guide page for the specific UN number and respond appropriately. The NOTOC is, in effect, the bridge between the air carrier's internal knowledge and the emergency response community on the ground.

Many air carriers are now required or choose to transmit NOTOC data electronically to the destination station before landing so that ground handlers and emergency coordinators have advance notice. Some integrate NOTOC data into flight following systems that can be queried by dispatchers, operations control centers, and emergency coordinators simultaneously.

Key Numbers and Rules

49 CFR 175.33 — the core rule requiring the operator to provide written dangerous goods information to the PIC before departure.
49 CFR 175.75 — segregation requirements for incompatible dangerous goods in the same cargo compartment.
49 CFR 175.31 — PIC notification duties when undeclared dangerous goods are discovered in flight.
14 CFR 121.557 — dispatcher and PIC shared authority and responsibility in operational control, including emergency situations involving dangerous goods.
Civil penalties under 49 U.S.C. 5123 can reach $84,425 per violation per day (indexed for inflation) for hazmat violations; criminal penalties can include fines and imprisonment of up to 5 years under 49 U.S.C. 5124 for knowing violations.
The NOTOC must be retained by the carrier for a specified period after the flight as part of the cargo record.

Common Test Traps

Confusing the shipper's declaration with the NOTOC. The shipper's declaration is the shipper's document; the NOTOC is the carrier's document to the PIC. They are separate and serve different regulatory purposes.
Thinking the NOTOC is optional for small quantities. Even quantities that qualify as limited quantity or excepted quantity shipments may still require notification to the PIC if they are on a passenger aircraft, though the nature of the documentation can differ. Always verify the specific exception and aircraft type.
Assuming the dispatcher's job ends at the NOTOC. Dispatchers must update the NOTOC for any last-minute cargo changes and re-deliver it to the PIC. An outdated NOTOC is as dangerous as no NOTOC at all.
Forgetting that the PIC can deviate from regulations during a dangerous goods emergency. Under 14 CFR 121.557, the PIC has emergency authority. The dispatcher supports—not overrides—the PIC once the aircraft is airborne.
Misidentifying the location requirement. The NOTOC must specify the exact cargo compartment or stowage location. Simply listing the shipment without a location is not compliant and defeats the emergency response purpose of the document.