Annex 14 and the Aerodrome Inspection Programme

A State certifies an aerodrome by checking it and its manual against Annex 14 before it grants a certificate. An aerodrome obstacle chart is an Annex 4 chart of the obstacles near the aerodrome. ASTM D5340 is the test method that rates airport pavement on a Pavement Condition Index from 0 to 100.

The word “requires” is doing too much work

Airport people say “Annex 14 requires us to inspect the lights” the way they say “gravity requires things to fall”. It sounds like a settled fact. It is usually wrong, and the way it is wrong matters.

Annex 14 does not require anything of you directly. It is addressed to States. What requires something of an aerodrome operator is the national rule the State wrote to give effect to Annex 14, and that rule is not always identical to the Annex. Sometimes it is stricter. Sometimes the State filed a difference and it is not the same rule at all. Either way, the document your inspector opens has your country’s letterhead on it.

Getting this right changes who you have to satisfy. That is the whole point of this post.

What Annex 14 actually is

Annex 14 is one of the Annexes to the Convention on International Civil Aviation. It carries SARPs , Standards and Recommended Practices, for aerodrome design and operations. It uses the word aerodrome, which it defines as an area on land or water, with any buildings, installations and equipment, intended for the arrival, departure and surface movement of aircraft.

The two words are defined terms, not description. A Standard is a specification whose uniform application is recognised as necessary for the safety or regularity of international air navigation, and to which Contracting States will conform, with notification to the Council compulsory under Article 38 of the Convention if compliance proves impossible. A Recommended Practice is one whose uniform application is recognised as desirable, and to which States will endeavour to conform. Necessary against desirable, compulsory notification against endeavour.

Note the subject of both sentences. Contracting States. Not aerodromes, not operators, not contractors.

The Annex has internal layers too, and they do not all carry the same weight.

Two rows are worth pausing on. An Attachment looks like part of the Annex, is bound into the same volume, and is not part of the Standards and Recommended Practices. And the bottom row, your own manual, is the only place in the table where the obligation is fully specific: this task, this interval, this tolerance, this signature.

How a SARP becomes something you can be inspected against

ICAO adopts Annex 14 under Article 37 of the Convention. A State then writes the Standards into its own rules, and the transposed text binds you. ICAO adopts, the State transposes, the national rule binds. Three steps, and only the third has any force over an aerodrome operator.

Article 38 is the step people forget. States must notify ICAO of any difference between their national regulations and practices and the Standards of the Annex. They are invited to notify differences from Recommended Practices too, when that matters for the safety of air navigation. The Annex also points States to Annex 15 for publishing differences through the aeronautical information service.

This is not paperwork trivia. A filed difference means the text that governs your airfield is not the text in the Annex. If you build an inspection programme by reading Annex 14 and skipping your own national rule, you can be perfectly aligned with ICAO and still non-compliant at home. The reverse also happens, where a national authority requires more than the Annex does, and the extra is just as binding as the rest.

Read your rule. Then read the Annex, for context.

How an aerodrome is certified

Annex 14 section 1.4 is the starting point. A certificate signifies to aircraft operators that, at the time of certification, the aerodrome meets the specifications and, in the certifying authority’s view, can maintain them while the certificate is valid. It also sets the baseline for continued monitoring.

Three provisions carry the process:

• States shall certify aerodromes used for international operations (1.4.1), and should certify aerodromes open to public use (1.4.2, a Recommendation).
• The regulatory framework shall include criteria and procedures for certification (1.4.3).
• As part of certification, the applicant submits an aerodrome manual for approval or acceptance before the certificate is granted. It covers the site, facilities, services, equipment, operating procedures, organisation and management, including a safety management system (1.4.4).

The Annex sends the detail elsewhere. The stages of certifying an aerodrome are in the PANS-Aerodromes (Doc 9981), and guidance on the regulatory framework is in the Manual on Certification of Aerodromes (Doc 9774). What your own State requires is in the national rule. See aerodrome certification for the EU and US versions.

Obstacle charts

An aerodrome obstacle chart is defined in Annex 4, Aeronautical Charts, and not in Annex 14. Annex 14 Chapter 4 sets the obstacle limitation surfaces. The chart records the obstacles. There are three ICAO charts of this kind:

See aerodrome obstacle chart for scales, accuracy and what counts as an obstacle. The Annex 4 edition cited here is from 2009, so check the current edition before you rely on a figure.

Chapter 10, and what it establishes

Annex 14 Volume I runs from general information and definitions through physical characteristics, obstacle restriction, visual aids , electrical systems and operational services. Chapter 10 is Aerodrome Maintenance, and it is where most of the maintenance obligation has its origin. It covers maintenance in general, pavements, removal of contaminants, runway pavement overlays and visual aids.

What Chapter 10 establishes first is an obligation to have a maintenance programme, including preventive maintenance where appropriate, to maintain facilities in a condition which does not impair the safety, regularity or efficiency of air navigation (10.1.1). The Annex counts pavements, visual aids and electrical systems among those facilities. For visual aids it adds a Standard: a system of preventive maintenance shall be employed to ensure lighting and marking system reliability (10.5.2).

The Annex is not silent on numbers, and it is worth being exact about which ones.

• Unserviceable light. A light is deemed unserviceable when its main beam average intensity falls below 50 per cent of the value in the appropriate figure of Appendix 2, or of a higher value where one is required (10.5.1).
• Daily inspection. Movement area inspections shall be carried out each day, at least once where the aerodrome reference code number is 1 or 2 and at least twice where it is 3 or 4. Runways get extra inspections when surface conditions may have changed significantly (2.9.3).
• Pavement surfaces. Surfaces shall be inspected and their conditions monitored regularly as part of a preventive and corrective maintenance programme, to avoid and eliminate foreign object debris (10.2.1).

Approach lighting and runway lighting for CAT II and III

For a precision approach runway category II or III, the Annex sets objectives for the preventive maintenance system. During category II or III operations all approach and runway lights are to be serviceable and, in any event, at least:

• 95 per cent in the inner 450 m of the approach lighting system, the runway centre line, threshold and edge lights
• 90 per cent in the touchdown zone lights
• 85 per cent in the approach lighting beyond 450 m
• 75 per cent in the runway end lights

The percentages must not change the basic pattern of the lighting, and an unserviceable light may not be adjacent to another one, except in a barrette or crossbar (10.5.7). Category I has its own objective of 85 per cent for the approach, threshold, edge and end lights (10.5.10). Take-off runways have theirs in 10.5.11 and 10.5.12.

The checks themselves are Recommendations, not Standards. The system for a category II or III runway should include visual inspection and in-field measurement of intensity, beam spread and orientation, measurement of the electrical characteristics of each circuit, and a check of the intensity settings used by air traffic control (10.5.3). Measurement should cover all lights as far as practicable, with a mobile measuring unit accurate enough to analyse individual lights (10.5.4, 10.5.5). The frequency should follow traffic density, local pollution, equipment reliability and the results so far, and not be less than twice a year for in-pavement lights and once a year for other lights (10.5.6).

For the inspection side of an approach system, see approach lighting system inspection .

Runway edge light intensity

The Annex states the edge light intensity in two places. Runway edge lights shall show an intensity adequate for the visibility and ambient light, and in any case at least 50 cd, or not less than 25 cd at an aerodrome without extraneous lighting (5.3.9.9). On a precision approach runway they follow Appendix 2, Figure A2-9 or A2-10 (5.3.9.10). The maintenance threshold of 50 per cent of the Appendix 2 value, above, is a separate test. Measuring it in the field is covered in runway edge light inspection and ICAO requirements , and the clause-by-clause view is on the ICAO Annex 14 standard page .

The EU and US versions

You can watch the transposition happen. In Europe, Regulation (EU) No 139/2014 requires the aerodrome operator to establish and implement a maintenance programme, including preventive maintenance where appropriate, to maintain aerodrome facilities, systems and equipment in a condition which does not impair the safety, regularity or efficiency of air navigation (ADR.OPS.C.005). Separate rules require the operator to inspect the movement area surfaces to assess their condition regularly (ADR.OPS.C.010) and to implement a preventive and corrective maintenance programme for the serviceability of individual lights and the reliability of lighting systems (ADR.OPS.C.015). The operator must also monitor the movement area and carry out regular inspections of it (ADR.OPS.B.015).

“Regular” is the operative word, and the rule itself does not define it. The acceptable means of compliance does give a starting point. It says inspections of items such as FOD, the status of visual aids, wildlife and surface conditions should be carried out each day, at least once for code number 1 or 2 and at least twice for code number 3 or 4 (AMC1 ADR.OPS.B.015). It also says the programme should be commensurate with the traffic expected. Everything beyond that is you.

The programme is a document, and it is yours

This is the step that turns an obligation into something an auditor can check.

Under a certification regime, an aerodrome operator holds a certificate on the basis of a manual. In Europe the aerodrome operator must establish and maintain an aerodrome manual that contains or refers to all necessary information for the safe use, operation and maintenance of the aerodrome and its equipment. Intended amendments go to the competent authority in advance, some for prior approval and some as notification (ADR.OR.E.005). In the United States, 14 CFR 139.203 lists the required elements of the Airport Certification Manual, and two of them are directly relevant here: a description of, and procedures for maintaining, the marking, signs and lighting systems, and procedures for conducting the self-inspection program.

That is where your intervals come from. Not from the Annex. From the document you wrote and your authority accepted.

The consequence is uncomfortable and worth stating plainly. Once the interval is in your manual, missing it is a finding, even if no international Standard names that interval. And doing better than your manual says, with a method your manual does not describe, is also a finding. The manual is not a summary of what you do. It is the specification you are audited against.

Two different inspections, and only one of them is evidence

Almost every aerodrome programme contains two activities that get called “inspection” and answer completely different questions.

The routine one is a serviceability check. 14 CFR 139.327 requires the certificate holder to inspect the airport daily, except as otherwise required by the Airport Certification Manual, when any unusual condition such as construction or weather may affect safe air carrier operations, and immediately after an accident or incident. The record kept is of conditions found and corrective action taken, held for at least 12 consecutive calendar months. The Part 139 lighting rule tells you what “properly maintain” means in that context: cleaning, replacing or repairing anything faded, missing or non-functional, keeping it unobscured and clearly visible, and ensuring it gives the user an accurate reference (139.311).

The periodic one is measurement. It asks whether the system still meets the specification it was built to, which is a question a walking inspection cannot answer. A runway edge light can be clean, lit, unobstructed and out of photometric tolerance. A PAPI can pass a visual check and still sit outside its angular tolerance.

The last two rows are the reason the distinction matters. A year of clean daily logs proves you ran your programme. It does not prove a single light meets its standard. When an authority asks for conformity evidence, only the second column answers, and it only answers if it is dated, traceable and reproducible. What that looks like in practice is what a regulator actually accepts as evidence . On the systems we measure, including the PAPI , the deliverable is built to be the second column: a measured value per unit, the tolerance it was judged against, and the adjustment for anything outside it.

Pavement: where ASTM D5340 fits

Annex 14 asks for pavement inspection and monitoring (10.2.1) but does not name a rating method. ASTM D5340 is one. It is the standard test method for airport Pavement Condition Index surveys, and it determines airport pavement condition through visual surveys. The PCI runs from 0, a failed pavement, to 100, a new one.

The United States ties it to a schedule. Under FAA AC 150/5380-7B, federally obligated airports must perform a detailed inspection of airfield pavements at least once a year. If a PCI survey is performed as set out in ASTM D5340, the detailed inspections by PCI surveys may be extended to three years. Those inspections come on top of routine maintenance inspections. See ASTM D5340 and PCI for how a survey works. ASTM sells the standard, and this post does not quote it.

Where the manuals sit

Doc 9137, the Airport Services Manual, and Doc 9157 , the Aerodrome Design Manual, are the documents most often mistaken for requirements. They are guidance. Doc 9137 Part 9 covers airport maintenance practices and Part 2 covers pavement surface conditions. Doc 9157 Part 4 covers visual aids and Part 5 electrical systems. The Annex itself points to Doc 9137 Part 9 for preventive maintenance of visual aids (10.5.2) and to Doc 9157 Part 4 for maintenance criteria for aeronautical ground lights (10.5.1). Doc 9774, the Manual on Certification of Aerodromes, is the guidance behind the regulatory framework and the certification process.

None of them obliges an operator to do anything. They tell a State how it might implement the Annex, and they give everyone else a common vocabulary. The same is true one layer down: an FAA advisory circular contains, by the regulation’s own words, methods and procedures acceptable to the Administrator, which is a different thing from a requirement (139.311(f), 139.327(d)).

Guidance becomes binding on you at exactly one moment: when you cite it in your own manual. Write “measured in accordance with Doc 9157 Part 4” into your procedure and you have made a guidance document into your own auditable commitment. That is a reasonable thing to do. Do it deliberately, and only for text you have actually read.

What to do with this

Four things, in order.

Find the national rule, not the Annex. Check whether your State has filed differences against the Annex 14 provisions that touch your programme. Then read your own aerodrome manual and compare what it says you do against what you actually do, because that gap is what a compliance audit finds first. Where the manual is vague, make it specific before an inspector makes it specific for you.

And treat the change itself as a change. Moving an inspection method or interval is a change to a safety-relevant task, which is a safety management system matter with its own expected artefacts. Your compliance documentation is the manual, the procedure, the change assessment and the retained data together, not the last report you received.

Annex 14 is the reason all of this exists. It is not the document you are inspected against. Your regulatory authority is who you have to satisfy, and your own manual is what they read first.