A bulkhead is any wall, screen or curtain that partitions the fuselage into distinct spaces. Found from nose to tail, the panels divide the cabin into classes, separate passengers from galleys and lavatories, and mark the front row of seating. These first-row bulkhead seats are easily spotted on seat maps: with no seat directly ahead, they grant extra legroom and quicker aisle access. Beyond passenger comfort, bulkheads are structural members that carry load and preserve the aircraft's overall integrity.
Expert behind this article
Jim Goodrich
Jim Goodrich is a pilot, aviation expert and founder of Tsunami Air.
What is a bulkhead in an airplane?
A bulkhead is a physical partition that divides a plane into different classes or sections and separates the seats from the galley and lavatory areas. Bulkhead seating refers to the seats immediately behind the bulkheads, which provide extra room in front but may also mean less legroom.
A bulkhead is an interior dividing wall that separates cabins and different sections of the aircraft interior. These upright walls within the fuselage of an airplane serve as barriers between different sections of the cabin, like between first class and coach seating areas, or between passenger areas and service sections like galleys and lavatories.
Bulkheads are transverse walls that contribute to the overall layout of the cabin. They enclose lavatories and galleys, creating distinct functional zones within the aircraft. These partitions optimize the plane's layout while boosting both passenger safety and comfort throughout the flight experience.
What is the purpose of a bulkhead in an aircraft?
The purpose of a bulkhead in an aircraft is to provide structural strength. Bulkheads are important structural components that strengthen the thin-skinned fuselage by creating a rigid frame. The structural partition absorbs flight loads, so bulkheads contribute to structural integrity of the aircraft. Because bulkheads are strategically positioned throughout an aircraft to optimize structural integrity, they help the thin shell resist bending and twisting. The bulkhead resists stresses so that the dividing wall keeps the circular cross-section intact.
Bulkheads are important functional components that preserve safety in flight. After sudden decompression, bulkheads give crew time to don oxygen masks because each sealing wall contains the pressure drop to one bay. In fire protection, a firewall is a fireproof bulkhead that separates a hot area like an engine compartment from an adjacent structure, increasing safety by preventing the spread of flames.
Bulkheads are used to separate classes in passenger aircraft. Bulkheads are used to segregate cargo areas and to enclose galleys and lavatories. Bulkheads enhance safety and organization by forming a barrier between different sections of the aircraft, so bulkheads contribute to the overall layout of the cabin and help make boarding and service quicker.
What is the structure of a bulkhead in aircraft?
A bulkhead is a structural lateral panel in a fuselage. It separates different sections of an aircraft and is installed in the fuselage. The bulkhead assembly includes a simple frame, a rim angle, a buttstrap, and tension fittings. The frame follows the contour of the fuselage and is comprised of a center web, an upper flange, and a lower flange. The upper flange has a front portion and a rear portion, with the rear portion projecting upward and backward.
The simple frame is fixed to the skin with a reinforcement plate named buttstrap, which is placed between the lower flange of the frame and the skin. Rivets are used to attach the frame to the skin, and the skin is fixed to the lower flange by rivets. The stiffening plate is riveted along a rear rim to the center web of the simple frame. The rim angle is L-type with a front portion and a rear portion, and the rear portion is slanted upward and backward relative to the skin. The rim angle receives pressure loads from the bulkhead.
Stringers are coupled to the skin via tension fittings, which include front and rear tension fittings. The front and rear tension fittings couple the stringers to the buttstrap and are riveted to the stringers. The buttstrap is a reinforcement plate placed between the lower flange of the frame and the skin. The frame is cylindrically-symmetrical, and the assembly structure incorporates stiffening plates. The skin can be manufactured in one piece and is part of the load-carrying system.
What materials are aircraft bulkheads made of?
Aerospace pressure bulkheads are typically made from lightweight yet durable materials like aluminum alloys, titanium, or advanced composites like carbon fiber-reinforced plastic (CFRP). Aluminum alloys remain the most widely used wrought aluminum alloy in aircraft construction due to their light weight and excellent conductivity. Titanium rings or rings produced by resin transfer molding are often incorporated into composite bulkheads to provide stiffness without adding excessive weight.
To achieve further weight savings, manufacturers bond CFRP skins to honeycomb cores made of DuPont Kevlar or Nomex . These cores have very low electrical conductivity, high fire resistance, and help increase airplane fuel efficiency while reducing aviation emissions. Airbus, for example, integrates advanced composite materials into their bulkhead designs for weight reduction, and the A350 features the first MLGB pressure bulkhead made entirely in composite. GKN Aerospace offers lightweight, durable titanium and composite bulkheads, while Spirit AeroSystems specializes in composite structures and intricate assembly techniques. Ceramic-based composites are employed in firewalls and turbine engine compartment liners because they can withstand temperatures of 2,500 degrees Fahrenheit, addressing stringent safety standards.
Traditional applications still employ high-quality birch or aircraft plywood for fuselage bulkheads, wing ribs, and firewalls in smaller aircraft or high-power rocketry. These plywoods have very few voids, more plies than standard shop plywood, and provide necessary strength without adding excessive weight. Magnesium alloy sheets are employed in the frame of various helicopters when weight reduction is especially vital. Regardless of the material, epoxy like West System 105/205 is used to bond bulkheads, guaranteeing the resulting parts withstand vibration extremely well.
What are the types of bulkheads in an aircraft?
Bulkheads are categorized based on position and purpose. Transverse bulkheads divide the fuselage side to side and prevent deformation and racking stresses. Longitudinal bulkheads extend fore and aft; engineers use them inside transverse bulkheads to increase the number of compartments. Watertight bulkheads include collision bulkheads, which are situated in the front part of the aircraft. Transverse walls are bulkheads that create separate compartments, while longitudinal walls are bulkheads that run along the length of the cabin. Door surrounds are reinforced frames within a bulkhead wall, forming a doorway while maintaining structural and fire-containment integrity.
What are bulkhead seats on planes?
Bulkhead seats are airline seats directly behind the bulkhead. They are the first row of seats in a cabin, located directly behind a physical wall that separates different sections of the cabin or between classes. Because there is no seat directly in front, bulkhead seats usually have more legroom than other seats of the same fare class. This extra room makes them a choice for passengers who prioritize extra legroom, as well as for parents traveling with infants, since these seats often have bassinet hooks and are marked on the seat map for family friendly features.
Proximity to the front of the plane, lavatories, and galleys is another hallmark of bulkhead seating. This placement allows faster deplaning and easier aisle access, and the seats often come with priority or early boarding. However, the same location puts passengers close to hubs of activity, including galley noise and lavatory foot traffic. Tray tables are stowed in the armrest, and federal rules require that all carry-on items be placed in the overhead compartment during taxi, takeoff, and landing because there is no seatback in front. Some bulkhead seats have an additional fee, and in premium cabins they feature a larger footwell cutout or a counter in front.
What is the purpose of a pressure bulkhead in an airplane?
The purpose of a pressure bulkhead is to give physical protection. In every jet that climbs to the tropopause, the forward pressure bulkhead closes the front of the pressurized fuselage and the aft pressure bulkhead closes the back. Both bulkheads are primary structure members; they carry the forward and aft pressure loads when the cabin is inflated to an 8,000 ft (2,438 m) equivalent. Acting like the end caps on a cylindrical air tank, the domed or flat walls let a sealed pressure vessel exist inside the fuselage, keeping passengers comfortable and avionics, cargo, or the radome outside the pressure envelope.
The forward pressure bulkhead is located at the nose of the fuselage, directly behind the unpressurized radome formed from fiberglass. It gives physical protection against strikes from foreign objects like birds and is designed to withstand pressure loading when the cabin is pressurized relative to ambient. Forward pressure bulkhead provides structural closure for the pressurized cabin zones and prevents the spread of pressure-related failures while also serving as a barrier for the pressurized interior cabin.
Aft bulkhead in an aircraft is the rear unit of the pressure seal and is responsible for maintaining passenger cabin pressure. It carries structural loads, including torsional loads from the vertical tailplane, and acts as the aft pressure dome mount. Some designs integrate a pressure door so stairs are accessed through the aft pressure bulkhead, while DC-9/MD-80/90 stairs are aft of the bulkhead itself.
Flat aft pressure bulkheads give more internal space but add weight. Curved aft pressure bulkheads reduce the amount of metal needed at the cost of reducing usable space in the airliner. Composite aft pressure bulkheads reduce weight by roughly 35 kg (77.2 lb), eliminate corrosion risk, and lower part count while meeting damage-tolerance criteria for Class I structural components under FAA directives. Pressure bulkheads are engineered to endure cyclic pressurization loads exceeding 8 psi, maintain body shape, and enable differential-pressure containment across the fuselage cross-section.
Jim GoodrichPilot, Airplane Broker and Founder of Tsunami Air
