Aerospace RFQ Best Practices

A well-built aerospace RFQ package does more than “get a quote.” It aligns engineering intent, program risk, and supplier capabilities so you receive comparable bids, predictable lead times, and parts that pass qualification the first time. In aerospace and defense manufacturing—especially where additive manufacturing (AM), PM-HIP, precision CNC machining, and regulated quality systems intersect—an RFQ is effectively a mini contract. Missing details show up later as change orders, schedule slips, or nonconformances.

This guide lays out what to include (and how to specify it) so suppliers can price accurately, plan capacity, and build to your requirements under AS9100/flowdown controls, ITAR/DFARS obligations, and inspection expectations like CMM, NDE, and CT scanning.

Required documents

Start by packaging everything a supplier needs to quote a compliant, buildable part. If you want fewer clarifications and tighter pricing, provide a single, complete RFQ package rather than sending drawings and requirements in fragments over email.

Include these baseline documents:

1) Technical data package (TDP)
Provide the controlled drawing and any associated model(s):

• 2D drawing (PDF) with GD&T (ASME Y14.5 or your stated standard), critical characteristics identified, and a clear note set for finish, heat treat/HIP, and inspection.
• 3D CAD model (STEP/Parasolid preferred) when applicable. If the model is for reference only, state that explicitly; otherwise define which is controlling (drawing vs model).
• Build orientation or datum scheme when AM is intended. For powder bed fusion (PBF) parts (DMLS/SLM), orientation influences support strategy, surface condition, distortion risk, and post-machining stock.

2) Material and process specification callouts
Suppliers cannot quote intelligently without knowing what “material” actually means in your context:

• Alloy and form: e.g., Ti-6Al-4V (Grade 5), Inconel 718, 17-4PH, AlSi10Mg, etc.
• Manufacturing route: CNC from wrought, casting + machining, AM (PBF DMLS/SLM) + stress relief + HIP, or PM-HIP near-net + machining.
• Post-processing requirements: stress relief, solution/age, HIP parameters if controlled by your spec, surface treatments, and any prohibited processes.

3) Quantity and lot structure
Quote differences can be dramatic based on production intent:

• Prototype vs production quantities (e.g., 2 pcs for fit check, then 50 pcs/lot).
• Lot definition (lot size, whether lot is per build, per HIP cycle, per heat, or per batch). This matters for material traceability, test coupons, and inspection sampling.
• Spares and overage policy (acceptable overrun/underrun percentage).

4) Delivery requirements and ship-to details
Provide target need date, ship-to address, receiving hours, and any dock constraints. If multiple deliveries are acceptable (partial shipments), state the rules up front.

5) Administrative and compliance flowdowns
If you operate under regulated requirements, include the relevant contractual language or flowdown matrix:

• ITAR marking and data-handling expectations (who may access technical data, where it may be stored).
• DFARS or DoD contract clauses that affect sourcing, specialty metals, counterfeit prevention, and record retention.
• Quality system requirements such as AS9100, customer-specific requirements, and special process accreditation expectations (e.g., NADCAP for certain thermal processing/NDE).

Practical tip: put a one-page “RFQ cover sheet” at the front: part number(s), revision, quantity, delivery targets, required certifications, inspection level, packaging, and a single point of contact. Suppliers will use that page to triage feasibility and schedule a technical review.

Revision and configuration control

In aerospace, configuration control is where many RFQs quietly fail. A supplier can build exactly what you sent and still deliver a part you cannot accept—because the drawing was obsolete, the model didn’t match the print, or the RFQ referenced the wrong specification revision.

Build revision control into the RFQ package:

1) Identify the controlling authority
State clearly whether the 2D drawing is controlling, the 3D model is controlling, or if they are dual-controlled with defined precedence. Many shops will assume the drawing controls unless told otherwise; AM workflows sometimes lean on the model for build planning. Remove ambiguity.

2) List every document with its revision
Create a short configuration table:

Drawing: PN 12345 Rev C
Model: PN 12345 Rev C (STEP)
Spec: Heat treat ABC-001 Rev F
Spec: Inspection DEF-010 Rev B

When specs are embedded as notes, ensure the note references the correct standard revision. If you require a supplier to follow a customer spec in addition to an industry standard, include the customer spec.

3) Define your change-control and deviation process
Suppliers will discover manufacturability constraints—especially for PBF parts with thin walls, enclosed channels, or tight flatness requirements after HIP and machining. You need a defined route for resolution:

• Engineering questions window: specify a date by which clarifications must be submitted.
• Deviations/waivers: state whether you accept a supplier deviation request and the approval authority.
• ECO incorporation: define how changes are communicated (revised RFQ package, updated drawing, and written acknowledgement).

4) Configuration for additive builds
If you are buying AM hardware, treat build planning as controlled configuration when it affects acceptance:

• Build orientation constraints (if any), support removal requirements, and where support contact is permitted.
• Post-processing sequence expectations: e.g., PBF → stress relief → support removal → HIP → rough machine → NDE/CT (if required) → finish machine → final inspection.
• Witness coupons and their relationship to the lot (per build plate, per machine, per powder batch).

Procurement reality: if you do not specify the control points (what requires approval vs what is supplier choice), you will either over-constrain the quote (higher cost, longer lead) or under-constrain the build (higher risk of first-article failure).

Quality requirements

Quality requirements should be written so they are auditable, quotable, and verifiable. Vague requests like “cert pack required” produce inconsistent responses. Instead, list the exact certifications, traceability, and records you expect at shipment.

1) Quality system and compliance
If your program demands it, state it as a gating requirement:

• AS9100 certification (and whether ISO 9001 is acceptable for non-flight hardware).
• Special process controls such as NADCAP expectations for thermal processing or NDE, where applicable to your part and contract.
• ITAR compliance requirements and controlled unclassified information handling if relevant to your program environment.
• DFARS flowdowns affecting sourcing, record retention, and counterfeit prevention.

2) Material traceability and documentation
Request full material traceability to the heat/lot and, when relevant, to powder batch.

For conventional machining from wrought:
Require mill test reports (MTRs) tied to heat number, and a certificate of conformance (CoC) stating the supplied material meets the specified alloy and condition.

For PBF AM (DMLS/SLM):
Request a traceability plan that covers:

• Powder pedigree: powder manufacturer, alloy, lot number, and any reuse/recycling policy used for the build.
• Build identification: machine ID, build ID, build date, and operator (as required by your QMS).
• Post-processing traceability: stress relief/heat treat/HIP cycle records tied to the build lot.

For PM-HIP:
PM-HIP can deliver near-net shapes with excellent density, but the RFQ must define what “good” looks like:

• Powder source and chemistry requirements (and whether blended powder is allowed).
• HIP cycle documentation (temperature/pressure/time), and whether cycle is fixed by your spec or supplier-controlled with minimum requirements.
• Canister removal and surface condition expectations, plus machining allowance requirements.

3) Define the certification pack content
Instead of “provide certs,” list what you want in the shipment dossier:

• Supplier CoC with PO, part number, revision, quantity, and statement of conformance to drawings/specs.
• Material certifications (MTRs, powder certs) traceable to each lot.
• Process certifications for heat treat, HIP, plating/coating, and other special processes (include subcontractor details if applicable).
• Inspection records (first article, in-process, final).
• Nonconformance history and dispositions, if any, including deviation approvals.

4) Supplier qualification expectations
If you require an on-site audit, source approval, or a first article inspection (FAI) package to AS9102, state it at RFQ time. Many suppliers can support FAI but need to plan quality engineering time into the quote.

Step-by-step: how strong suppliers actually quote quality cost

• Step 1: Review drawing notes and identify special processes (HIP, heat treat, coating, NDE).
• Step 2: Confirm internal vs subcontract capability, including NADCAP status where required.
• Step 3: Map traceability points (material receipt → build/lot → post-process → machining → inspection).
• Step 4: Allocate labor for record creation and review (FAI ballooning, inspection planning, cert pack compilation).
• Step 5: Price risk where requirements are ambiguous; your goal is to remove that ambiguity so you don’t pay for it.

Inspection requirements

Inspection language should tell suppliers exactly how you will accept the part. Over-specifying can create unnecessary cost; under-specifying can create late surprises when parts hit receiving inspection or MRB.

1) Define inspection level: prototype vs production
For prototypes and first articles, it’s common to require more extensive measurement to validate process capability. For steady-state production, you may accept sampling plans. Your RFQ should separate:

• First Article Inspection (FAI): whether you require AS9102 format, ballooned drawing, and full characteristic accountability.
• In-process inspection: any mandatory hold points or witness points (e.g., before HIP, after HIP, before final machining).
• Final inspection: full inspection vs sample inspection, and required documentation.

2) Call out metrology methods when critical
If your part has tight true position, profile, or complex freeform surfaces, specify how measurement should be performed:

• CMM inspection for GD&T-heavy parts, with datum strategy aligned to your drawing.
• Optical scanning for certain surface profiles (if acceptable), with reporting format defined.
• Thread gaging requirements (go/no-go, functional gage) for critical threaded interfaces.

3) NDE and internal defect requirements
For AM and PM-HIP components, internal quality can be as important as external dimensions. If you care about it, the RFQ must state it explicitly.

• CT scanning (computed tomography): define whether CT is required for all parts, first article only, or sampling. Specify acceptance criteria (e.g., porosity thresholds, lack-of-fusion indications) via your internal spec or drawing note. CT is powerful for PBF parts with internal passages, but it must be tied to a pass/fail requirement.
• Other NDE methods: dye penetrant, ultrasonic, radiography, etc., as applicable. If a standard is required, cite it and revision. If NADCAP is required for the NDE process, state it.

4) Mechanical testing and coupon strategy (AM/HIP)
If you require tensile testing, density verification, or microstructure evaluation, specify:

• Test type: tensile, hardness, density, chemistry, microstructure.
• Frequency: per build, per heat/lot, per HIP cycle, or per X parts.
• Coupon location: witness coupons on the build plate (for PBF) or from PM-HIP lot, and whether they must share the same thermal history as the parts.
• Reporting: what data must be included in the test report and traceability to part serial/lot.

Step-by-step: a practical inspection plan for an AM + HIP + machining part

• Step 1: Incoming verification of powder pedigree or wrought material MTRs.
• Step 2: In-process checks during PBF build (machine logs) and after depowdering/support removal.
• Step 3: Post-HIP verification for distortion risk: rough CMM/scan to confirm machining stock and datums are viable.
• Step 4: Rough machining to establish datums, followed by intermediate CMM to catch drift before high-value finishing.
• Step 5: NDE/CT (if required) scheduled at the point where it prevents wasted machining time but still reflects final condition per your acceptance criteria.
• Step 6: Finish machining + final CMM, then compile the inspection report and cert pack for shipment.

Delivery and packaging

Delivery and packaging requirements are often treated as “logistics,” but for aerospace hardware they directly affect part condition, traceability, and receiving efficiency. State what you need so suppliers can plan appropriately and avoid rework or rejections at incoming inspection.

1) Delivery schedule and lead time assumptions
Ask suppliers to quote:

• Standard lead time and any expedite options.
• Time drivers (material procurement, AM build queue, HIP scheduling, NADCAP subcontract lead time, CMM capacity).
• Split shipments policy: whether partial delivery is allowed and how it impacts price and documentation (each shipment needs its own CoC and traceability references).

2) Packaging requirements
Specify packaging by part type and condition:

• Cleanliness expectations (free of chips, powder, oils) and whether parts must be cleaned after machining or post-processing.
• Damage prevention for precision surfaces: individual bagging, caps for threads, foam/compartmentalized boxing, and corrosion prevention where required.
• Identification: part marking requirements (serialization, lot number, heat number where applicable) and whether marking method is restricted (laser etch, dot peen, tag-only).
• AM-specific concern: ensure depowdering is complete for internal passages if applicable; if you require documented powder removal verification, state it.

3) Receiving documentation and traceability at the box level
A common best practice is to require a packing list that maps each part serial/lot to the associated cert pack sections. That makes receiving faster and reduces the chance that parts get separated from documentation.

4) Export-controlled and controlled data handling
If the order is ITAR-controlled, define:

• Labeling requirements on the package and paperwork (as permitted by your security policy).
• Data return/destruction expectations for obsolete revisions or end-of-program.

Red flags

The fastest way to improve outcomes is to recognize patterns that predict RFQ churn, uncompetitive pricing, or late quality escapes. These red flags apply whether you’re sourcing machined billets, AM + HIP hardware, or PM-HIP near-net components.

1) “Quote assumes…” statements that shift risk back to you
Examples include assumptions about inspection scope, unspecified surface finish areas, or “HIP if needed.” If the RFQ is clear, the quote should be clear. Ambiguous assumptions usually mean the supplier is pricing uncertainty or planning to negotiate later.

2) No explicit traceability plan for AM or PM-HIP
If a supplier cannot explain how they maintain powder/lot traceability, build identification, and post-process record linkage, your certification pack will be weak—making acceptance and future audits painful.

3) Overpromising lead time without acknowledging constraints
For programs involving HIP, NADCAP special processes, CT scanning, or 5-axis machining, lead time is often driven by bottleneck resources. A credible quote explains the critical path (e.g., AM build → HIP slot → rough/finish machining → CMM → NDE). Unrealistic lead times can indicate schedule risk.

4) Quality certifications that don’t match the scope
AS9100 is a baseline for many aerospace suppliers, but it doesn’t automatically mean the supplier can perform special processes in-house. Ask who performs heat treat, HIP, coating, and NDE—and how those subs are controlled. If your program requires NADCAP for a specific process, confirm that the actual performing facility meets it.

5) Incomplete manufacturability feedback
Good suppliers will comment on:

• AM minimum wall thickness, overhang/support strategy, and post-machining stock for PBF parts.
• Distortion risk through HIP and subsequent machining, especially on thin sections.
• Datum accessibility for 5-axis machining and CMM probing.
• Inspection feasibility for internal features (whether CT is needed or alternative acceptance methods exist).

If you receive a quote with no technical questions on a complex part, that can be a warning sign that the drawing wasn’t thoroughly reviewed.

6) RFQ packages that force suppliers to guess
From the buyer’s side, the red flag is an RFQ missing acceptance criteria. If you haven’t defined what constitutes an acceptable CT scan result, what “critical characteristics” are, or whether you need AS9102 FAI, you will not get apples-to-apples quotes. Fix the package and reissue; it’s faster than trying to normalize inconsistent bids later.

Use your aerospace RFQ as a risk-control tool
The strongest RFQ packages translate engineering intent into a supplier-ready plan: controlled revisions, unambiguous quality flowdowns, defined inspection and documentation, and practical delivery/packaging details. When you do that—especially for additive workflows that include HIP, post-processing, and precision CNC machining—you reduce nonrecurring engineering churn, stabilize cost, and protect schedule on the programs that matter.