For engineers and contractors working on high-voltage transmission lines in Saudi Arabia, understanding FAA Advisory Circular 70/7460-1L is a fundamental requirement. Whether your specification calls for FAA-compliant power line markers, ICAO standard warning spheres, transmission line visibility markers, or span guard balls this guide covers what the standard requires and how to select the right product.
FAA Advisory Circular 70/7460-1L is the standard for the marking and lighting of obstructions that present a hazard to navigable airspace. It was issued on December 04, 2015 by the Responsible Office AJV-1, Airspace Service.
The circular sets forth standards for marking and lighting obstructions that have been deemed to be a hazard to navigable airspace, including overhead transmission lines where low-flying aircraft hazard marking is required.
Alongside FAA AC 70/7460-1L, the product must also comply with ICAO Annex 14, 6th Edition, July 2013, and CAAC standards.
These products are referenced by several names across different industries and regions. All of the following refer to the same certified safety device:
Regardless of what name appears in your project specification or tender document, the compliance requirements under FAA AC 70/7460-1L and ICAO Annex 14 remain the same.
Aviation danger orange marker balls are the primary required colour for most transmission line wire strike prevention installations. All approved colour options are:
Colour sequencing rules: markers must alternate along the span, with aviation danger orange marker balls always at each end. If fewer than four markers are on the line, all must be aviation orange.
When multiple wires or cables are involved, the marker must be located on the highest wire.
These visibility standards ensure that ICAO standard warning spheres and FAA compliant power line markers provide adequate visual warning for overhead cables — meeting low-flying aircraft hazard marking requirements in open terrain.
Clamp: Aluminum alloy or die-casting alloy — clamp diameter range 6.5–55mm
Fasteners: Stainless steel 304 — bolts, nuts, and washers
Voltage Range
35 KV to 1,000 KV
FAA compliant power line markers, span guard balls, and transmission line visibility markers are required wherever cables create a low-flying aircraft hazard marking need:
Why Choose Alrouf LED?
Alrouf LED supplies FAA compliant power line markers, ICAO standard warning spheres, span guard balls, and aviation danger orange marker balls meeting FAA AC 70/7460-1L, ICAO Annex 14, and CAAC standards. The GS-AWS model specifications:
Request a compliance datasheet or project quote today.
www.alroufled.com | sales@alroufled.com.
Q: What is FAA Advisory Circular 70/7460-1L?
A: It is the standard issued December 04, 2015 by the FAA Responsible Office AJV-1, Airspace Service. It sets forth standards for marking and lighting obstructions deemed to be a hazard to navigable airspace — including transmission line wire strike prevention markers.
Q: What are FAA compliant power line markers?
A: Obstruction marking spheres — also called aerial marker balls, aircraft warning spheres, transmission line visibility markers, span guard balls, or ICAO standard warning spheres — that meet FAA AC 70/7460-1L, ICAO Annex 14, and CAAC standards.
Q: What are span guard balls?
A: A contractor term for spherical obstruction markers installed on overhead power lines — the same product as aerial marker balls, aircraft warning spheres, and transmission line visibility markers — required to meet FAA and ICAO compliance standards.
Q: What are ICAO standard warning spheres?
A: Obstruction marking spheres that comply with ICAO Annex 14, 6th Edition, July 2013. They are the same product as FAA compliant power line markers, span guard balls, or aviation danger orange marker balls — all names refer to the same certified safety device.
Q: What color must FAA compliant markers be?
A: Aviation orange is the primary required color. Aviation danger orange marker balls must be positioned at each end of any marked span. Colors must alternate when multiple markers are installed.
Q: How does this support transmission line wire strike prevention?
A: By providing a clear visual warning for overhead cables from 1,250 meters in the air and 350 meters from the ground — giving pilots adequate time to detect cables and avoid collisions.
Q: How far apart must power line markers be spaced?
A: 600mm sphere: max 30m. 800mm sphere: max 35m. 1,300mm sphere: max 45m.
Q: Where can engineers in Saudi Arabia source FAA compliant power line markers?
A: Alrouf LED supplies FAA and ICAO compliant span guard balls, ICAO standard warning spheres, and aviation danger orange marker balls. Contact sales@alroufled.com or visit www.alroufled.com.
