A signature your own records do not allow should not be possible
The short answer. At a repair station in the United States, each person authorized to approve an article for return to service must be appropriately certificated as a mechanic or repairman under part 65 (14 CFR 145.157), the rosters must be updated within 5 business days of a hire, departure, reassignment or change of duties (14 CFR 145.161), training follows an FAA-approved program with records kept at least two years (145.163), and tools used for airworthiness determinations must be calibrated to a standard acceptable to the FAA (145.109). A single sign-off on a measured step therefore rests on a roster entry, an authorization the station's manual defines, a current training record, a calibrated tool and current data. The rule does not define a business day, so the station decides how to count one and writes it in its manual. A certificated person signs, and the station's repair station manual governs how each of these is done.
On a paper traveler, a stamp in the Tech box says three things at once: this person was authorized for this step, their training was current, and the tools they used were in calibration. Part 145 asks the station to be able to show all three. Paper cannot check any of them at the moment the stamp goes down. That check happens later, in an audit, if it happens at all.
This article walks through the rules that meet at that signature, an example of how a sign-off goes wrong between spreadsheets, and what a quality manager can do about it. It is general information, not legal or regulatory advice, and your repair station manual governs how your station does each of these things.
Last reviewed: November 11, 2026
The rules that meet at the signature
Who may approve a return to service, 145.157. At a station in the United States, each person the station authorizes to approve an article for return to service must be appropriately certificated as a mechanic or repairman under part 65, and must be able to read, write and understand English.
The rosters, 145.161. Three rosters: management and supervisors, inspection personnel, and the people authorized to sign a maintenance release. Each person on them needs an employment summary: job title, years and kind of experience, past employers, the scope of the current job, and any certificate and ratings held. The rosters must be updated within 5 business days of a hire, a departure, a reassignment or a change of duties.
Training, 145.163. An FAA-approved training program with initial and recurrent training, and training records kept at least two years.
Tools and data, 145.109. Tools and test equipment used to make airworthiness determinations must be calibrated to a standard acceptable to the FAA, and the manuals, bulletins and other data for the work must be current and accessible when the work is done.
Put together, a single signature on a measured step rests on a roster entry, an authorization your manual defines, a current training record, a calibrated tool of the right range, and the current revision of the manual.
An example, with invented people and dates
A component shop hires a new inspector, who starts on Tuesday, November 10, 2026. The same week, one of its technicians reaches step 6 of a wheel traveler, an eddy current inspection.
The roster clock. Five business days from Tuesday the 10th lands on Wednesday the 18th if Veterans Day, Wednesday the 11th, is left out, and on Tuesday the 17th if it is counted. A spreadsheet with a due date typed in by hand will hold whichever the person typing chose, and nothing reminds anyone on the 17th. The rule does not define a business day; decide how your station counts it, write it in your manual, and apply it the same way every time.
The authorization. The technician holds authorizations for disassembly, cleaning and torque on this wheel, but not eddy current. On paper, nothing stops the stamp. The authorization list is a spreadsheet in the quality office, and the traveler is on the bench.
The training. Her recurrent wheel and tire safety course was due a week ago, on November 3. Under this shop's manual, a lapsed course suspends every wheel authorization it gates until she completes it. The training spreadsheet shows the lapse in red, but only to someone who opens it.
The tool. The torque wrench on her bench came due for calibration on November 7. The sticker says so, if she looks.
None of these is unusual. Each is a fact the station already has, in a different place from the signature it should govern. The audit that finds one of them finds it weeks later, and then the work since has to be reviewed.
How it goes wrong in spreadsheets, and how to do better
- The rosters and the authorization list drift apart. A person added to the inspection roster but not to the authorization list, or the other way round. Keep one list of people and derive both from it.
- Training dates are recorded but not connected. Write down, for each recurrent course, which authorizations it gates. Then a lapse has a consequence you can look up.
- The 5-business-day clock starts from memory. Log every hire, departure and change of duty the day it happens, with the date the roster update is due beside it, and review that list every morning.
- Tool use is not recorded per step. If the traveler does not name the tool on each measured step, a tool found out of tolerance cannot be traced to the units it measured. Add a tool ID column to every measured step.
- The manual revision is not on the traveler. Record the revision each traveler was built from, so a newer one logged midway is visible.
A spreadsheet can hold all of this. What it cannot do is stop the stamp.
How a system does it
The live demo shows this for Corvane Aero Components, a fictional 30-person component repair station. The system holds the station's people, authorizations, training records and tool register, and checks them on the server every time someone signs a step.
When the technician reaches for the eddy current step, or a wheel step after her recurrent wheel and tire safety course lapsed, the system refuses and says why in plain words: the record that stops her, the rule behind it, who can sign it today, and what lets her sign again. Each measured step asks which calibrated tool was used; a tool past its date is greyed out with the reason and refused even if someone forces it, and only tools whose range fits the measurement are offered. Nobody can inspect their own work. Every refusal is kept as the quality manager's evidence that the rules hold.
The quality manager's view shows the three rosters with the 5-business-day clock running on this morning's hire (federal holidays do not count in the demo), training due in the next 60 days and what each lapse would suspend, and tools coming due. When the calibration lab reports a tool out of tolerance, the system lists every step it measured since its last good calibration, with each reading and how many of those units were already released, and opens a finding to review them.
The system drafts and checks; it refuses signatures the station's own records do not allow, and a certificated person signs. It never approves anything for return to service, and we make no claim that it is FAA accepted. The AI helper reads incoming paperwork and drafts Block 12 of the 8130-3 for the inspector to check and edit; it never signs or decides. Your manual governs, and the system is built to follow it. Adopting a new records system usually means a revision to your repair station manual, submitted to your Flight Standards office, and a build is planned around that.
See it for yourself
The repair station page sets out what we build for component shops of 15 to 80 people. The live demo signs you in with one click, needs no account, and resets every night: sign in as the technician and reach for a step she is not authorized to sign. A typical build is $8,000 to $25,000 at a fixed price, then hosting and support from $350 a month, with no per-user fee.
Questions
How long does a Part 145 repair station have to update its rosters?
Under 14 CFR 145.161, within 5 business days of a hire, a departure, a reassignment or a change of duties. The rule does not define a business day, including whether federal holidays count, so the station decides, writes it in its manual and applies it the same way every time.
Can records software approve an article for return to service?
No. Approval for return to service is made by a person the station authorizes who is appropriately certificated under part 65 (14 CFR 145.157); a records system can at most check a sign-off against the station's own records. The station's manual governs, and adopting a new records system usually means a manual revision submitted to the station's Flight Standards office.
How long must a repair station keep training records?
14 CFR 145.163 calls for an FAA-approved training program with initial and recurrent training, and training records kept for at least two years.