FDA 483 Citations for Equipment Maintenance Under 21 CFR 820.70(g)

23 hours ago

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"Schedules for the adjustment, cleaning, and other maintenance of equipment have not been [adequately] established." FDA investigators cited 21 CFR 820.70(g)(1) with that wording 19 times on system-generated Form FDA 483s in fiscal year 2025.

This citation is smaller than the top device observations, but it often appears beside larger ones. When a process drifts, a seal fails or a molding press produces short shots, the investigator asks how the equipment is maintained. A missing preventive maintenance program weakens the defense of every process that equipment runs.

What the citation means

Examples written after "Specifically" usually describe:

No preventive maintenance schedule for production equipment
Maintenance performed when equipment breaks, not on a schedule
Maintenance records that do not show the date, the work done or who did it
Overdue maintenance with no assessment or approval to keep using the equipment
Maintenance by an outside contractor with no records kept by the manufacturer
No posted adjustment limits or tolerances for equipment that operators adjust
Equipment returned to service after repair without checking that it still performs as qualified

What 21 CFR 820.70(g) required

Under the Quality System Regulation, each manufacturer had to ensure that all equipment used in the manufacturing process meets specified requirements and is appropriately designed, constructed, placed and installed to facilitate maintenance, adjustment, cleaning and use.

Maintenance schedule (820.70(g)(1)): schedules for the adjustment, cleaning and other maintenance of equipment to ensure manufacturing specifications are met. Maintenance activities, including the date and individual performing them, had to be documented.
Inspection (820.70(g)(2)): periodic inspections in accordance with established procedures to ensure adherence to maintenance schedules, documented with the date and individual conducting them.
Adjustment (820.70(g)(3)): inherent limitations or allowable tolerances visibly posted on or near equipment requiring periodic adjustments, or readily available to personnel performing them.

What changed under QMSR

Under QMSR, in effect since February 2, 2026, the requirement comes from ISO 13485:2016 clause 6.3, Infrastructure. The organization must document the requirements for the infrastructure needed to achieve conformity to product requirements, prevent product mix-up and ensure orderly handling of product. Infrastructure includes buildings, workspace and utilities, process equipment (hardware and software) and supporting services.

The organization must document requirements for maintenance activities, including the interval of performing them, when such activities, or lack thereof, can affect product quality. These requirements apply to equipment used in production, the control of the work environment, and monitoring and measurement. Records of maintenance must be maintained.

Clause 7.5.1 also calls for qualification of infrastructure, so equipment returned to service after major repair may need requalification.

How to respond to the 483

FDA generally considers responses received within 15 business days of the close of the inspection before deciding on further action.

Inventory the equipment

List every piece of equipment that can affect product quality, including production equipment, environmental control systems such as HVAC, and utilities such as compressed air and purified water.

Set maintenance requirements

For each item, define the maintenance tasks, the interval and the basis for it, such as manufacturer recommendations, usage, history or risk. Post adjustment limits where operators adjust equipment.

Assess past performance

For the equipment cited, review process data, nonconformances and complaints to decide whether missing maintenance affected product.

Run the program

A maintenance schedule in a tracked system
Work orders that record the date, work done, parts used and person performing it
Rules for overdue maintenance: equipment is tagged out or quality approves continued use with a documented assessment
Review of contractor maintenance reports
Requalification or functional checks after major repairs
Periodic review of maintenance records and trends

What a compliant preventive maintenance procedure contains

Scope: equipment, utilities and environmental systems
Equipment identification and records
Maintenance tasks, intervals and their basis
Scheduling, work orders and completion records
Overdue maintenance and out-of-service tagging
Repairs and return to service, including requalification
Contractor maintenance
Posting of adjustment limits
Periodic inspection of the program

Common mistakes in maintenance responses

Copying manufacturer intervals without considering usage or history
Leaving utilities and environmental systems out
Tracking schedules but not recording what was done
Returning repaired equipment to production without any check
Treating calibration and maintenance as the same program without covering both

Example: how one response section might read

This illustrates structure only; your response must describe your own facts.

Observation 12: Schedules for the maintenance of equipment have not been adequately established. Specifically, the pouch sealer has no maintenance schedule, and the last recorded maintenance was 19 months ago.

Response:

Product assessment: Seal strength results for all lots sealed in the last 19 months were within specification, and no seal-related complaints were received.
Correction: The sealer was serviced on a stated date, and an operational check against the validated parameters was performed.
Corrective action: A preventive maintenance procedure was issued. Seventy-two pieces of equipment were inventoried, and each has a defined interval in the maintenance system.
Root cause: Maintenance relied on one technician who left the company, and no system tracked the work.
Verification: Quality will review overdue maintenance monthly and report it at management review.

Frequently asked questions

Is preventive maintenance the same as calibration?

No. Calibration confirms measurement accuracy. Maintenance keeps equipment working as intended. Both are required where they affect product quality.

How do we choose maintenance intervals?

Start with the equipment manufacturer's recommendations and adjust based on usage, history and risk. Document the basis.

Do we need to requalify equipment after repair?

When a repair could affect performance, confirm the equipment still operates within its qualified parameters before returning it to production.

How A.P. Lyon documents help

A.P. Lyon's Preventive Maintenance Procedure covers equipment inventory, schedules, work orders, overdue maintenance and return to service. It works with the Installation Qualification Procedure, the Calibration System Procedure and the Facility Inspection Procedure.

Documents are editable Word and Excel files and must be adapted to your equipment and organization. Maintenance intervals must come from your own equipment and history.

Next steps

Inventory equipment that affects product quality
Set intervals and record every maintenance activity
Control overdue maintenance and repairs
Respond within 15 business days with dates for each action

To build a complete set of procedures at a volume discount, use Build Your QMS. For help with a 483 response, see A.P. Lyon consulting services.

Not sure where your quality system stands? Take the free QMS gap check: about 20 questions, an instant report of your gaps by clause, and the procedures that close each one.