Aircraft Component Logistics: Rotables, Consumables and What Each One Needs
Short answer
Aircraft component logistics is the movement of aircraft parts under the control and record rules that follow the part itself. A rotable is repaired and returned to service, and if it is life-limited its record must travel with it under 14 CFR 43.10(d). A consumable is fitted once and discarded, so packaging and shelf life matter more.
Two boxes leave the same dock on the same night, both marked “aircraft parts”, both urgent.
One holds a hydraulic actuator that will be overhauled and flown again for another twenty years. The other holds a case of O-rings that will be fitted once and thrown away. They weigh about the same. They cost the shipper about the same to move. And almost everything else about them (what has to be in the box, what has to come back, what happens if the paperwork is wrong) is different.
That difference is the whole job. This page sets out the four inventory categories the industry actually uses, then sets them against the vocabulary the regulator uses, because those two lists are not the same list and the second one is the one that carries legal weight.
What Is Aircraft Component Logistics?
Aircraft component logistics
The movement, control and documentation of aircraft parts between operators, repair stations, distributors and stores: organised around what happens to each part after it is fitted, rather than around its size or its price.
Ordinary freight is planned around dimensions, weight and deadline. Aircraft component logistics adds a fourth question that ordinary freight never asks: does this part come back?
A part that comes back has a service life, a repair history and, often, a legal record that has to stay attached to it. A part that does not come back has none of that, but it may have a shelf life, a temperature range or a hazard class instead. Route both the same way and you will eventually strand an aircraft, not because the box was late, but because what was inside it could not legally be installed when it arrived.
If you want the wider picture of why aircraft freight behaves differently from general freight, that is covered separately in aerospace logistics: what makes moving aircraft parts different. This page stays on the categories.
Rotable, Repairable, Consumable, Expendable: What Is the Difference?
These four words are inventory terms. They come from airline stores and MRO practice, not from the Code of Federal Regulations. You will not find “rotable” defined in 14 CFR. That matters, and we come back to it in the next section, but this is the language every stores clerk, buyer and planner you deal with will use, so it is worth being exact about it.
| Category | What it is | Typical examples | Does it come back? | What has to move with it |
|---|---|---|---|---|
| Rotable | A high-value component that is removed, overhauled and returned to serviceable stock, then fitted to a different aircraft. It cycles indefinitely between aircraft and shop. | Hydraulic actuators, starter-generators, avionics line-replaceable units, wheels and brakes | Yes: repeatedly, for the life of the type | Serviceable/unserviceable status, its identity by part and serial number, and (if it is life-limited) the record required by 14 CFR 43.10 |
| Repairable | Repaired a limited number of times and then scrapped. Economically a rotable with a ceiling. | Some structural panels, certain ducting, many interior assemblies | Yes, but a finite number of times | The same identity and status documents; repair history matters more, because the count towards scrap is the asset |
| Consumable | Fitted once and used up. Not repaired, not returned. Usually bought in quantity and drawn from stores. | Filters, seals, O-rings, gaskets, lubricants, sealants, adhesives | No | Batch or lot identity, and shelf-life/cure-date control where the material ages |
| Expendable | Low-value, fitted once, generally not tracked by serial number at all. In many stores systems the same bin as consumables. | Fasteners, clips, cotter pins, safety wire | No | Conformity to the specification it was bought against: see “standard part” below |
The line most people get wrong is the last one. Consumables and expendables are often treated as one bucket in a warehouse, and for storage that is fine. For shipping they are not one bucket at all: a sealant with a cure date and a temperature range is a controlled shipment, and a bag of cotter pins is not.
Why Do the Regulator’s Words Matter More Than the Inventory Words?
Because the inventory words decide how a part is accounted for, and the regulator’s words decide whether it can be installed. Only one of those two can ground an aircraft on arrival.
Here is the vocabulary that actually appears in the regulations, with what each term does.
| Regulatory term | Where it is defined | What it means | Why it changes the shipment |
|---|---|---|---|
| Article | 14 CFR 21.1(b)(2) | “a material, part, component, process, or appliance” | The umbrella term. If someone says “we only ship parts, not articles”, they have not read the rule |
| Commercial part | 14 CFR 21.1(b)(3) | An article listed on an FAA-approved Commercial Parts List inside the design approval holder’s Instructions for Continued Airworthiness | Its eligibility comes from a list held by the design approval holder, not from the box it arrived in |
| Standard part | 14 CFR 21.9(a)(3) | An article “manufactured in compliance with a government or established industry specification”, the rule’s own example being a nut or a bolt | This is what makes most expendables shippable without an airworthiness approval document: the specification is the credential |
| Life-limited part | 14 CFR 43.10(a) | “any part for which a mandatory replacement limit is specified in the type design, the Instructions for Continued Airworthiness, or the maintenance manual” | This is the one with a hard federal transport duty attached. See the next section |
Note what is missing from that table: rotable, repairable, consumable, expendable. None of them are regulatory categories. A rotable may or may not be life-limited. A consumable is almost never life-limited but may still be a hazardous material. The two lists cross each other; they do not map onto each other. Treating “it’s a rotable” as if it answered the compliance question is the single most common mistake in this area.
What Must Legally Travel With a Life-Limited Part?
This is the part of the job that is not a matter of good practice. It is 14 CFR 43.10, and it is written as a duty on whoever removes the part.
A life-limited part is defined in 43.10(a) as any part with a mandatory replacement limit in the type design, the Instructions for Continued Airworthiness or the maintenance manual. Its life status is the accumulated cycles, hours or other mandatory limit it has reached.
Under 43.10(c), once such a part is removed from a type-certificated product it must be controlled by a method that “deter[s] the installation of the part after it has reached its life limit”. The rule lists seven acceptable methods:
- A record keeping system substantiating part number, serial number and current life status
- A tag or record attached to the part, carrying the same three data points
- Non-permanent marking of the current life status
- Permanent marking of the current life status
- Segregation: a record kept, plus physical storage away from installable parts
- Mutilation, rendering the part “beyond repair and incapable of being reworked to appear to be airworthy”
- Any other method approved or accepted by the FAA
Then comes the sentence that turns a maintenance rule into a logistics rule. 14 CFR 43.10(d): any person who removes a life-limited part and later sells or transfers it “must transfer with the part the mark, tag, or other record used to comply with this section, unless the part is mutilated before it is sold or transferred.”
In plain operational terms: on a life-limited part, the paperwork is not an accessory to the shipment. It is part of the shipment. A box that arrives with the component and without its record has not delivered a usable part, however fast it got there. The rule as it now stands dates from FAA Docket 2000-8017 (67 FR 2110, 15.01.2002), with the disposition duty applying to parts removed after 15 April 2002, and was amended at 79 FR 67055 (12.11.2014).
This is the practical reason a component movement is handled as a documented, exclusive-use shipment rather than dropped into a mixed trailer: the record and the part have to stay together, and a transfer between handlers is where they separate.
Which Aircraft Components Are Also Hazardous Materials?
A large share of consumables, and some rotables, are regulated freight in their own right. Two cases come up constantly, and both have concrete numbers attached.
Lithium cells and batteries. Avionics units, emergency locator transmitters and portable equipment carry them. Under 49 CFR 173.185 the excepted-quantity thresholds are 20 watt-hours for a lithium ion cell and 100 watt-hours for a lithium ion battery. The shipment must be marked with the UN number that matches the configuration: UN3480 for lithium ion cells or batteries shipped alone, UN3481 where they are contained in or packed with equipment, and UN3090 / UN3091 for the lithium metal equivalents. Where packages go into an overpack, the lithium battery mark must either be visible through the overpack or reproduced on the outside, and the overpack marked “OVERPACK”.
Chemical oxygen generators. These sit in the cabin ceiling of most airliners, and they are the component with the worst safety history in this whole subject. 49 CFR 173.168 permits transport only under stated conditions. Two of them are worth quoting because they are checkable on the dock: the generator, unpackaged, must withstand a 1.8 metre drop onto a rigid, non-resilient, flat horizontal surface in the position most likely to cause actuation or loss of contents (173.168(b)); and it must carry a defined means of preventing inadvertent actuation: for a mechanically actuated device not installed in protective breathing equipment, two pins, each independently capable of preventing the actuator from striking the primer, or one pin and one retaining ring, or a cover over the primer plus a pin (173.168(c)(1)(i)).
Whoever handles those shipments has to be a trained hazmat employee. 49 CFR 172.704(a) requires general awareness, function-specific, safety and security awareness training, and 172.704(c) requires it to be repeated at least once every three years, with the employer keeping a training record covering the preceding three years for as long as the person is employed and for 90 days afterwards.
How Does the Category Change the Way the Shipment Is Actually Run?
| Question on the load | Rotable / repairable | Consumable / expendable |
|---|---|---|
| What is the failure mode? | Arriving without its record, or with the wrong serial number against the record | Arriving out of shelf life, out of temperature, or without lot identity |
| What is the return leg? | Real and planned: the unserviceable unit goes back to the shop or to the core pool | Usually none |
| How is it packed? | Purpose-built ATA container or shop-supplied case; damage in transit destroys the asset | Manufacturer packaging; the packaging is often the compliance |
| What is the handling risk? | Handling damage and static; high value per piece | Hazard class, cure date, cross-contamination |
| Where does time pressure come from? | An aircraft is down and a serviceable unit is being chased | A scheduled check will stop if a kit is short |
| Who signs for it? | Named receiver, condition and serial number recorded | Quantity and lot number recorded |
The right-hand column looks easier and usually is. The left-hand column is where a movement is worth buying properly: single-vehicle, named driver, no intermediate handling, condition and identity recorded at both ends. That is the same reason high-value freight is moved under white-glove control.
What Should You Ask Before You Hand a Component to a Carrier?
Six questions. All six are answerable in a minute by a carrier that does this work, and at least two of them will stall a carrier that does not.
- Is the part life-limited, and where is its 43.10 record right now? If the answer is “in the system, we’ll email it”, the record is not moving with the part and 43.10(d) is not satisfied.
- Is it a core return? If yes, the return leg and its packaging must be booked at the same time, not after the outbound has left.
- Is there a hazard class? Lithium and chemical oxygen generators are the common two; sealants and adhesives are the ones people forget.
- What is the serviceable-tag status? A part travelling as unserviceable to a shop and a part travelling as serviceable to a line station are two different shipments with the same dimensions.
- Is the container itself an asset? Purpose-built ATA cases are frequently worth more than the freight charge and are themselves tracked.
- Who signs, and against what? Serial number for a rotable, quantity and lot for a consumable. A signature against the wrong field is how a discrepancy becomes unprovable.
If the part is already on an aircraft-on-ground event, the clock and the escalation path are different again. That is set out in what AOG means and what it triggers.
The movement itself is in how AOG parts actually move.
Where Does Vic’s Fit in Component Movements?
Vic’s is a carrier, not a distributor, a repair station or a records custodian. We do not issue airworthiness approval tags, we do not determine whether a part is eligible for installation, and we will not tell you what a part’s life status is. Those belong to the design approval holder, the repair station and the operator.
What we do is the transport half, in the form the category requires: dedicated, exclusive-use movement where the part and its documents stay in one vehicle under one named driver; condition, piece count and identity recorded at pickup and delivery; the return leg for cores booked as part of the same job; and trained handling where a hazard class is involved.
If you are comparing forwarders rather than carriers for this work, the questions are different, and they are set out in what an MRO buyer is actually comparing.
What is the difference between a rotable and a consumable?
A rotable is a high-value component that is removed, overhauled and returned to serviceable stock to be fitted to another aircraft, so it cycles between aircraft and shop. A consumable is fitted once and used up. Neither term is defined in 14 CFR. They are inventory terms, and they do not map onto the regulator’s categories.
What does aircraft parts logistics actually involve?
Moving parts between operators, repair stations, distributors and stores while keeping each part’s identity, status and required records attached to it. For a life-limited part that record has to physically transfer with the part when it is sold or transferred (14 CFR 43.10(d)), so the documents are part of the freight rather than an attachment to it.
What makes a part critical in aviation logistics?
Two things, and they are independent. Operationally, a part is critical when an aircraft cannot fly without it. Legally, a part carries the heaviest handling duties when it is life-limited under 14 CFR 43.10 or when it is a hazardous material under 49 CFR: a cheap lithium cell can be more regulated than an expensive actuator.
Do aircraft parts need special transportation?
Some do, by rule rather than by preference. Life-limited parts must move with the mark, tag or record used to control their life status (14 CFR 43.10(d)). Lithium cells and batteries must be marked with the correct UN number and meet the 20 Wh cell and 100 Wh battery thresholds of 49 CFR 173.185. Chemical oxygen generators must meet 49 CFR 173.168, including a 1.8 metre unpackaged drop resistance.
Do I need a freight forwarder to move aircraft parts?
Not always. A forwarder arranges and consolidates movement across modes and carriers; a carrier moves the freight itself under its own authority and control. For a single time-critical domestic component, fewer handovers usually means fewer places for the part and its record to separate. The comparison is set out on our aircraft parts freight forwarding page.
Written by the Vic’s Freight operations desk. Verified 01.09.2026. Regulatory text retrieved from the eCFR live versioner API: 14 CFR 21.1, 21.9 and 43.10 from the title 14 edition of 24.08.2026; 49 CFR 172.704, 173.168 and 173.185 from the title 49 edition of 19.08.2026. Each section was checked in its own body for a suspension or Effective Date Note; none carries one. The rotable / repairable / consumable / expendable taxonomy is industry and airline-stores usage and is stated as such. It is not defined in 14 CFR or 49 CFR, and this page does not present it as regulation. This page states no market size, no average repair turn time and no exchange-pool figures: we have not measured them and there is no primary source we would be willing to cite for them. Nothing here is legal advice, and nothing here determines whether a part is eligible for installation. That decision belongs to the design approval holder, the repair station and the operator.