ISO 9001 AS9100 for Deep Hole Drilling — Quality Management

A manufacturer of deep-drilled aerospace components from Inconel 718 loses a contract with a major aerospace prime because it holds only ISO 9001:2015 certification without AS9100D or NADCAP accreditation for conventional machining. Implementing AS9100D over 14 months requires developing 23 documented procedures including FMEA, control plans, first article inspection per AS9102, and NDT qualification to ASTM standards. NADCAP accreditation for conventional machining (hole-making) adds special process controls for the BTA drilling operation, including defined parameters for speed, feed, coolant pressure, and guide pad condition with mandatory recording at specified frequencies. Passing the NADCAP audit secures the contract.

Quality Management Standards Overview ​

Deep hole drilling suppliers must navigate a hierarchy of quality standards depending on their industry sector.

ISO 9001:2015 for Deep Hole Drilling ​

ISO 9001:2015 is the baseline quality management standard. For deep hole drilling operations, the following clauses require specific attention.

AS9100D Additions for Aerospace ​

AS9100D includes all ISO 9001:2015 requirements plus additional aerospace-specific clauses. The following are particularly relevant to deep hole drilling for aerospace applications.

NADCAP Accreditation for Deep Hole Drilling ​

NADCAP (National Aerospace and Defense Contractors Accreditation Program) is managed by the Performance Review Institute (PRI). For deep hole drilling, the applicable scope is Conventional Machining as a Special Process, which covers hole-making operations.

NADCAP Conventional Machining Requirements ​

NADCAP Audit Frequency ​

Typical NADCAP Audit Findings for Deep Hole Drilling ​

AS9102 First Article Inspection ​

AS9102 requires a complete dimensional inspection of the first production part from a new tool or process setup. For deep hole drilling, this includes:

FMEA and Control Plan Development ​

Process FMEA for Deep Hole Drilling ​

Control Plan for Deep Hole Drilling ​

Documented Information Requirements ​

Audit Preparation ​

Troubleshooting Quality System Implementation ​

FAQ ​

What certifications are needed for aerospace deep hole drilling? ​

Minimum requirements are ISO 9001:2015 as the QMS foundation and AS9100D for aerospace-specific requirements including product safety, configuration management, and special process control. For companies performing deep hole drilling as a special process for flight-safety parts, NADCAP accreditation for conventional machining (hole-making) is typically required by aerospace primes. NDT personnel must be certified to ISO 9712 or SNT-TC-1A.

What is the difference between ISO 9001 and AS9100? ​

ISO 9001:2015 is a general quality management standard applicable to any industry. AS9100D includes all ISO 9001 requirements plus additional aerospace-specific requirements for product safety, risk management, configuration management, counterfeit part prevention, special process control, and customer-approval of nonconforming product disposition. AS9100 also requires more frequent internal audits (every 6 months vs annually) and documented FMEA and control plans.

What is NADCAP and does my deep hole drilling operation need it? ​

NADCAP is a special process accreditation managed by the Performance Review Institute (PRI). For deep hole drilling, it covers conventional machining as a special process, including hole-making operations. NADCAP is not mandatory for all aerospace work but is required by most aerospace primes (Boeing, Airbus, GE, Pratt & Whitney) for suppliers performing special processes on flight-safety parts. It requires documented parameter control, operator qualification, AS9102 first article inspection, and biennial re-audit with surveillance audits every 6 months.

What documentation is required for AS9100 certification? ​

AS9100 requires the ISO 9001 mandatory procedures (document control, record control, internal audit, nonconformance, corrective action, preventive action) plus additional procedures for risk management, configuration management, product safety, special process control, and counterfeit part prevention. For deep hole drilling, you also need process FMEA, control plans for each part family, setup sheets with defined parameters, tool life records, first article inspection reports (AS9102), and calibration records. Typical total is 15–40 work instructions and 30–70 forms and records.

How long does AS9100 certification take? ​

Implementation typically takes 9–18 months depending on the existing QMS maturity. For a company already certified to ISO 9001, adding AS9100 takes approximately 6–9 months. Steps include gap analysis (2–4 weeks), documentation development (8–16 weeks), training (4–8 weeks), internal audit (2–4 weeks), management review, and certification body audit (2 stages, 4–8 weeks apart). NADCAP accreditation requires additional 4–8 weeks of preparation specific to the special process.

What is AS9102 first article inspection? ​

AS9102 is a standardised first article inspection (FAI) requirement for aerospace. For deep hole drilling, it requires a complete dimensional inspection of the first production part from a new tool or process setup. The FAI includes a ballooned drawing with numbered characteristic callouts, a dimensional results report with actual measured values for each characteristic, a material certification review, a special process certification review, and a tooling and gauge list. The FAI must be repeated if the tooling, process, or design changes.

What is the NADCAP audit process for conventional machining? ​

The NADCAP audit for conventional machining (covering hole-making) begins with a self-assessment against the AC (Audit Criteria) checklist. The initial accreditation audit is conducted by a PRI auditor over 2–3 days, reviewing process documentation, parameter control, operator qualifications, machine maintenance, tool management, inspection methods, and nonconformance management. Findings are classified as major (must close before certification) or minor (must close within 30 days). Surveillance audits occur every 6 months. Renewal is every 24 months.

How does FMEA apply to deep hole drilling? ​

Process FMEA for deep hole drilling identifies potential failure modes at each process step — from material receipt through drilling to final inspection. Typical failure modes include chip packing (causing spiral marks), tool edge chipping (oversize bore), guide pad wear (taper and finish degradation), and vibration (chatter and waviness). Each failure mode is scored for severity, occurrence, and detection to calculate risk priority number (RPN). Actions are defined to reduce high RPN values, such as adding coolant pressure monitoring or increasing inspection frequency.

What training is required for deep hole drilling quality personnel? ​

Quality managers and internal auditors require ISO 9001 and AS9100 lead auditor training (5-day courses). NDT personnel must be certified to ISO 9712 or SNT-TC-1A for the applicable methods (visual, penetrant, eddy current, ultrasonic). Operators require documented on-the-job training for each machine and process they operate, with competency demonstration. NADCAP requires operator qualification records including training, experience, and skill verification for each special process operation.

How often must internal audits be performed? ​

ISO 9001:2015 requires internal audits at planned intervals (typically annually). AS9100D requires internal audits at least every 6 months. NADCAP requires internal audits of the special process at least annually. Many aerospace suppliers maintain a rolling audit schedule covering all QMS processes every 6 months, with additional focused audits for high-risk processes (deep hole drilling) every 3–4 months. Internal auditors must be independent of the area being audited.

Summary ​

Deep hole drilling suppliers serving aerospace must hold AS9100D certification (beyond ISO 9001:2015) and NADCAP accreditation for conventional machining (hole-making) to be eligible for contracts with major primes. AS9100 adds risk management, special process control, configuration management, product safety, and counterfeit part prevention to the ISO 9001 foundation. NADCAP requires documented process parameters (speed, feed, coolant pressure) with mandatory recording at defined frequencies, operator qualification records, AS9102 first article inspection, and biennial re-audit with 6-month surveillance. Implementation of AS9100 typically takes 9–14 months. Development of 20+ documented procedures, process FMEA, control plans, and training programs is required. Nonconformance management with root cause analysis, SPC monitoring of critical characteristics (diameter, finish, roundness), and calibration management are core operational requirements.