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On the drawings an aircraft maintenance base looks like one large hangar with two annexes. In operation it is a route. The aircraft comes in and gets towed to a bay. A component comes off and goes to a shop. The component comes back and is refitted. The aircraft leaves.
Each handoff crosses a line between two buildings. That line is where the delay usually starts. It is also, on most drawing sets, nobody’s job.
It starts at the apron. The door needs a threshold a tow tractor can cross, drainage that does not run back into the bay, and a seal that holds when the door is shut. Then the workshop, which can sit just across the wall and still be useless if its floor is a step lower or if the clear height stops at the first sprinkler main. Then the store, where pallets and racking take over from aircraft, and where a drum of solvent changes the fire compartment.
The delivery and quarantine area is the one nobody draws until the base is running and somebody needs to park a nose gear out of the way. It is also the first space to be squeezed and the last one to get an agreed clear height.
The hangar door opening follows the aircraft. follows the aircraft. Its height comes from the tallest point that has to pass through, plus the clearance the operator wants above it. Its width comes from the widest thing that has to pass, which depends on how the aircraft is towed in, wings level or nose first. Clear height inside the bay is measured to the lowest obstruction in the working zone, not to the roof. Floor level and floor tolerance come from towing and from the stands and jigs used in the bay.
Set the aircraft bay floor as a key reference, then coordinate workshop and store levels around their equipment and handling needs. Any level differences should be resolved before the slabs are poured. Two levels on one site tend to show up in the survey data long before they show up in the steel.
A column-free hangar bay has to stay clear, so its roof is carried on columns or frames at the edges. Some component shops need overhead cranes, which may require runway beams and additional column supports. Others only need benches, trolleys and local lifting equipment.Put the two under one roof and something has to give: a transfer structure over the shop, a heavier column line between them, or a movement joint where the buildings part company.
None of those is wrong. They cost money, and they are much easier to price while they are still lines on a drawing. One question worth asking early: which components actually travel by crane, and which only need a bench and a trolley. The store has the same problem in reverse. Racking does not need a bay-sized span, so putting the store under the hangar roof means paying for a span nothing uses.
The compartment between a store and a hangar has to close somewhere: a wall, fire doors, detection, possibly a deluge system. Hangar access doors should not be assumed to provide the required fire separation. This needs to be checked against the applicable fire code. Sprinkler zones, smoke exhaust, compressed air and power cross the same lines.
Every crossing needs one named owner. Without one it gets built twice, or not at all, and the commissioning list finds it months later, usually in front of the client.
Aircraft mix first, including the largest type to be served and the way it is towed. Then bay count and layout. Then the shop processes, because they set the crane and the floor tolerance. Then what goes into the store. Then how parts move in and out, and who owns the door.
Span, roof form and how the work is split into contracts come after that. Packaging is a commercial decision. It does not answer a single technical question by itself.
LF-BJMB supplies large-span steel structure and space frame systems: structural design support, steel members, secondary framing, purlins, roof and wall cladding, member numbering and phased shipping, and engineers on site for erection guidance. Door systems and their operators, floors and civil works, fire protection and MEP installations, and ground support equipment sit outside that scope. On a base with several buildings, the boundary is best written once, as a list per interface, rather than agreed four times in four meetings.
Q: Can the buildings be designed separately and the joints sorted out later?
A: Up to a point. One list has to own the levels: door threshold, floor level and tolerance, crane rail position, compartment line, movement joints. Without that list, the two things that go missing first are level and opening size, and both are expensive after the slab.
Q: Can the hangar and the shop share one roof?
A: They can, with a transfer structure or a movement joint, and with the shop’s crane columns entering the hangar’s structural logic. It works, but it is not the cheap option, and it should be checked rather than assumed.
A maintenance base is one operation spread over several buildings, and it stands or falls on the lines between them. Start from the aircraft, the parts and the tow path, and the door, the floor, the crane rail and the store end up on the same datum. Start from floor area, and they won’t. The steel looks much the same either way. The site does not.
If you are planning one, send the aircraft mix, the bay arrangement, the shop processes and the store list to [email protected]. We will mark where the structural interfaces fall and which ones have to be settled before the drawings freeze.
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