Explainer
List of Effective Pages and Manual Revisions
The Short Answer
How a Manual Proves Its Own Revision Status
A manual that changes over time has to carry its own history. In a paper or PDF maintenance manual that history lives in the front matter: a list of effective pages, a record of revisions, a record of temporary revisions, and highlights of the latest change, with revision bars in the margins of the pages themselves. Together they answer three questions: is every page here, is every page current, and what changed.
FAA Order 8110.54A, the guidance for reviewing instructions for continued airworthiness, states the expectation plainly: all manuals must have a method of recording updates to their content, such as a list of effective pages and a record of revisions. It also lists revision bars and date changes among the examples of the changes a manufacturer's distribution program has to deliver. The Order leaves the format to the applicant, and points to ATA iSpec 2200, GAMA Specification No. 2, and S1000D as sample formats. See instructions for continued airworthiness for the rule behind those manuals.
Front Matter
Five Things to Know How to Read
- List of effective pages (LEP)
- Every page in the manual, with the revision or date that page currently carries. Hold the manual against it and any missing, extra, or out-of-date page shows up. It is the main completeness check for a printed or PDF manual.
- Record of revisions
- The log of each revision issued: its number, its date, and when it was filed or incorporated, usually with the initials of whoever filed it. It answers the question of which revision this copy is at.
- Record of temporary revisions
- The same log for temporary revisions, the interim pages issued between normal revisions. It tells you which temporary pages should be in the manual right now, and which have been removed.
- Highlights, or summary of changes
- A short list of what the latest revision changed, usually by chapter, section, or page. It lets a reader decide which changes matter to the work in front of them without comparing the whole manual.
- Revision bars
- A mark in the margin beside text that is new or changed in the latest revision. They show what changed on a page you already have open, and are normally cleared at the next revision.
Layout, numbering, and wording vary by manufacturer, and the details are set in the introduction to each manual. The structure of the chapters those pages sit in is covered in aircraft manual types.
Interim Changes
Temporary Revisions and Customer Comments
Normal revisions arrive on a schedule, and some changes cannot wait for one. A temporary revision is the usual answer: a short set of replacement pages, issued ahead of the next normal revision, filed in the manual over or beside the pages it affects, and logged in the record of temporary revisions. When a normal revision absorbs the change, the temporary pages come out and the log is updated. The risk is in the filing: a temporary revision that was never inserted, or one that outlived its replacement, is a manual that is wrong in a way the cover page does not show.
Customer-originated changes run the other way. An operator or shop that finds an error or an unclear step reports it to the manufacturer, which evaluates it and may fold the fix into a temporary or normal revision. The report is only useful if the reader can say exactly where the problem was, which is another reason a manual needs stable page and task identifiers.
One category is stricter than the rest. Under Order 8110.54A, changes to the airworthiness limitations and to certification maintenance requirements must be FAA-approved before they are distributed, while other changes to instructions for continued airworthiness may go to owners as the FAA reviews them. See the airworthiness limitations section.
Proving Currency
How to Check a Copy Is Current
- Find the revision on the cover or title page, and the date of the last revision. In an electronic manual, look for the same information on a revision control page or on each page or block.
- Check that revision and date against the manufacturer's current revision status, taken from the source that manufacturer uses to publish it, not from a colleague's copy.
- Walk the LEP. Every listed page should be present, carry the listed revision or date, and nothing unlisted should be filed in the manual.
- Read the record of temporary revisions. Each active temporary revision should be in the manual at the right place, and any that the latest normal revision absorbed should be gone.
- Read the highlights for every revision since the copy you last used, and look at the revision bars on the pages that matter to the job.
- Record what you checked. For an operator, the evidence that the right revision reached the right people is part of the answer, which is the subject of the pipeline piece linked below.
Why it matters depends on who you are. Maintenance under 14 CFR 43.13(a) uses the methods in the current manufacturer's maintenance manual or instructions for continued airworthiness, or other methods acceptable to the Administrator. Air carriers and 91K operators face manual rules of their own: 14 CFR 121.135(a) requires paper manuals to show the date of last revision on every page, and electronic manuals to show it in a manner in which a person can immediately ascertain it, a rule revised by 88 FR 34437 in 2023. Advisory Circular 120-78B, paragraph 4.3.7, describes how an electronic system can meet it: revision status by page or block, a revision control page, a way to compare against the previous version, and revised content that is readily apparent. Read the text of the rule that applies to your operation.
Checking the copy is only half the job. The other half is how a revision gets from the manufacturer to the person doing the work, and the record that it did, which is covered in how aviation documentation stays current with service bulletins.
S1000D
The Same Job Without Pages
S1000D content is not page-based, so it has no list of effective pages. It does the same work with different parts, and a team moving from a page-based manual to S1000D has to know which part replaces which. For the full comparison of the two approaches, see ATA iSpec 2200 versus S1000D.
- Publication module
- Lists the data modules that make up the publication, in order. It plays the part of the table of contents, and, with the issue of each module, the part the LEP plays in a paper manual.
- Issue information
- Each data module carries its own issue number and in-work number, and a status such as new, changed, or deleted. The unit of revision is the module, not the page, so there is no page to list.
- Change record or highlights
- The default business rules name information codes for front matter, including 002 (list of pages or data modules) and 003 (change record or highlights). That is where a publication tells its reader what changed.
- Change marking
- A data module whose status says it was changed carries marked changes, so a viewer or a print can show a change mark where a paper manual would show a revision bar.
More on each part: the publication module, an annotated data module with its issue information, and the information codes. Check your program's business rules for how it expects highlights and change marks to be produced.
FAQ
Questions We Hear
What is a list of effective pages?
A page-by-page list at the front of a manual showing the current revision or date of every page. Its job is to let a reader confirm that the copy in hand is complete and current. FAA Order 8110.54A, which guides review of instructions for continued airworthiness, names a list of effective pages and a record of revisions as examples of the method every manual must have for recording updates.
What is the difference between a temporary revision and a normal revision?
In common practice a normal revision is a scheduled reissue that updates the manual and resets its records, while a temporary revision is a short interim change, issued when something cannot wait for the next normal revision. It is filed in the manual, logged in the record of temporary revisions, and removed when a later normal revision incorporates it. The exact numbering and page conventions are set by each manufacturer, so read the introduction to the manual you use.
Do I have to use the latest manufacturer manual revision?
Read the text of the rule that applies to you rather than relying on a summary. For example, 14 CFR 43.13(a) says maintenance is performed using the methods in the current manufacturer's maintenance manual or instructions for continued airworthiness, or other methods acceptable to the Administrator. Part 121 and 135 operators also have rules on their own manuals, such as the revision-date display requirement in 14 CFR 121.135(a). Which rule governs depends on who you are and what you are doing.
What does the FAA say about revision status in an electronic manual?
Advisory Circular 120-78B, paragraph 4.3.7, says electronic manuals for parts 91K, 121, 125, and 135 must display the date of last revision so a person can immediately ascertain it, and gives examples: a date on each page, a date on each block of a continuous-flow manual, or a revision control page. It also says revision information should give the content, the effective date, and incorporation instructions, and that revised content should be readily apparent.
How do customer comments reach the manufacturer?
Manufacturers generally publish a way to report errors and suggest changes, and a good one acknowledges the comment, evaluates it, and says in a later revision whether it was incorporated. The channel and the form differ by manufacturer, so find it in the manual's introduction or the manufacturer's publications support page. A change that affects airworthiness limitations has extra steps: FAA Order 8110.54A requires those changes to be FAA-approved before distribution.
Does S1000D have a list of effective pages?
Not as a page list, because the unit of content is the data module rather than the page. The publication module lists the modules in a publication, each module carries its issue number and status, and the default business rules name front-matter information codes for a list of pages or data modules and for a change record or highlights.
Get In Touch
Is Your Revision Trail Provable?
Tell us how your manuals are revised and distributed today. We will walk through what the front matter proves and where a copy could silently go stale.