Crucial Commercial Jet and Regional Jet Spare Parts to Stock

Even with regular attention given to proper aircraft upkeep, one may inevitably be faced with unexpected issues like component malfunction or failure, leading to undesirable operational setbacks and aircraft-on-ground (AOG) events. The downtime resulting from these situations can often have a great cost for airlines and operators, especially when scheduled flights have to be postponed or cancelled because critical parts of need are not on hand. To help you facilitate short maintenance turnarounds and deter the unexpected, read on as we discuss some of the most important categories of commercial and regional jet parts that should be stocked up on.

The Most Practical Recommendations for Strategy Formation

Before reviewing the common spare parts that MRO facilities should try to maintain stock of, it is useful to understand how to establish a more personalized method for narrowing down product categories for prioritization. The best way to do this is to create a baseline selection of necessary products by analyzing historical maintenance records. This will make it easy to identify exact part numbers that fail or are replaced most frequently, the intervals at which certain they tend to require renewal, and the quantities that have been procured in the past for resolution.

Based on these various findings, one should seek to maintain a suitable stock level for the items that will best support routine maintenance tasks, as well as a dedicated inventory of items that may not require frequent replacement but can significantly extend downtime if they are unavailable.

Basic Part Types You Should Stock Up On

Hardware

Hardware like fasteners, brackets, and seals are all critical for aircraft, with their presence being in nearly every assembly and area. Because of this, shortages of necessary components can halt even the most mundane maintenance activities. When it comes to formulating stocking strategies, the best items to have readily available include:

• Fasteners, Nuts, Bolts, Washers, and Rivets: These basic fastener categories find ample use throughout a typical airframe and its attached assemblies, securing everything from access panels and skin sections to critical avionics and engine components. Worn or defective fasteners can compromise the reliability of load-bearing structures or allow items to shift during operation, prompting immediate maintenance when issues arise.
• Brackets and Clamps: Brackets generally support the mounting of aircraft equipment, while clamps secure various routed systems or components. Together, such hardware keeps assemblies positioned and lessens the effects of vibration-related wear.
• Seals, Gaskets, and O-Rings: These sealing items facilitate proper retention within systems, prevent leaks, and deter the risk of contamination, regularly being found throughout hydraulic, pneumatic, and fuel systems alike. As these components often degrade over time in the face of intensive heat, pressure, or fluid exposure, they are expected to be replaced on a scheduled basis.
• Bearings and Bushings: Bearings and bushings support controlled movement and proper alignment within mechanical joints and assemblies, meaning they are prone to wearing out over time.

Consumables

Many consumable products have highly-predictable intervals for use and depletion, so MRO facilities should maintain these products in substantial quantities to prevent interruptions in workflow. Common forms of consumables that find ample use in the service and maintenance of aircraft include:

• Lubricants and Fluids: Hydraulic fluid, engine oil, grease, deicing fluids, and other forms of specialized fluids all have to be regularly replenished on an as-needed basis to properly manage friction, heat, and pressure.
• Filters: Air, fuel, oil, and c all must be replaced at defined periods or as they lose integrity to prevent the risk of contaminants entering vital system sections and impairing performance.

Landing Gear System Components

The landing gear assemblies of aircraft tend to experience some of the highest operational loads, a result of the friction, heat, and force that is generated during touchdowns. Due to the importance of such equipment, even minor defects can create a risk of immediately rendering an aircraft unairworthy. To avoid issues of downtime, operators usually stock up on:

• Tires: Most commercial operators follow retread programs, in which worn tires are sent to an approved facility for retreading and return to service. While this avoids having to retire tires every time they face excessive wear, MRO facilities should still retain serviceable options for immediate action. 
• Brake Pads, Linings, and Rotors: These friction components degrade through exposure to repeated c and braking loads, demanding replacements or exchanges at defined service intervals and wear limits.

Engine Components

• MRO facilities should seek to stock up on any c with high usage rates or longer procurement lead times, including: 
• Ignition Exciters and Igniter Leads: Ignition parts like exciters and igniter leads are often replaced for any troubleshooting or scheduled hot-section work. 
• Engine-Mounted Actuators: Actuators that regulate variable stator vanes, bleed valves, or thrust-reversers may face periodic replacement when excessive wear or response-time issues arise. 
• Engine Sensors: Sensors used for monitoring engine temperature, pressure, vibration, and rotational speed are essential for health tracking and proactive maintenance. As they can degrade from heat and vibration, operators should maintain a suitable inventory of the most important part numbers for servicing.

APU Parts

APUs are utilized throughout commercial operations and beyond to provide electrical and pneumatic power during ground operations, as well as commonly serve as backup power sources. Any APU malfunction can delay departures, so professionals should seek to preemptively procure necessary components like: 

• Starters: Starters will experience mechanical and electrical wear with each start cycle, making them a frequently replaced item when APU performance issues begin to occur.
• Controllers: Electronic control units govern APU operation, start logic, and protective functions, meaning that any fault should be taken seriously. As these parts may not be readily available all the time or may be higher in cost, operators should seek to hold at least one serviceable spare for each model in their fleet.

Electrical System Components

Electrical architecture underpins nearly every major function on modern aircraft, with MRO facilities maintaining a focused inventory of high-value, high-usage items like:

• Contactors, Relays, and Circuit Protection Devices: These components respectively enable functions like switching, load management, and fault protection, such equipment regularly being switched out on scheduled intervals or as functional issues arise.
• Wiring Harnesses and Electrical Connectors: Harnesses and connectors may require overhauls or replacement due to chafing, corrosion, heat exposure, or intermittent electrical faults, so operators usually stock part numbers that are associated with their most frequently serviced systems.
• Aircraft Batteries: Main and auxiliary batteries may slowly fail due to continual charge cycles, temperature exposure, and aging, meaning one should stock up on spare batteries to allow immediate replacement when performance drops or capacity tests fall below required thresholds.

Secure All the Spare Parts You Need Today from RFQ 360

As one can see, operators who treat spare-parts provisioning as a strategic priority will be better positioned to control maintenance costs and uphold fleet reliability, even in the face of industry-wide shortages or unexpected issues. If you are seeking a dependable procurement partner to source replacement components from, RFQ 360 platform is a one-stop shop with our extensive selection of certified commercial jet parts and regional jet spare parts. With competitive pricing and timely fulfillment options offered on over 6 billion unique items, you can always trust us to keep your MRO operations ready for the unexpected. To learn more about our parts and services, connect with our team at your convenience by phone, email, or Request for Quote (RFQ) submission.